Data Products Special IssueIssue 1, 2013 Maintenance Experience Bimonthly for Data Products No. 1 Issue 276, April, 2013 Preface In this issue of ZTE's Maintenance Experience, we continue to pass on various field reports and resolutions that are gathered by ZTE engineers and technicians around the world. The content presented in this issue is ten cases of ZTE's Data Products. Have you examined your service policies and procedures lately? Are you confident that your people are using all the tools at their disposal? Are they trained to analyze each issue in a logical manner that provides for less downtime and maximum customer service? A close look at the cases reveals how to isolate suspected faulty or mis-configured equipment, and how to solve a problem step by step, etc. As success in commissioning and service is usually a mix of both discovery and analysis, we consider using this type of approach as an example of successful troubleshooting investigations. While corporate leaders maintain and grow plans for expansion, ZTE employees in all regions carry out with individual efforts towards internationalization of the company. Momentum continues to be built, in all levels, from office interns to veteran engineers, who work together to bring global focus into their daily work. If you would like to subscribe to this magazine (electronic version) or review additional articles and relevant technical materials concerning ZTE products, please visit the technical support website of ZTE CORPORATION (http://ensupport.zte.com.cn). If you have any ideas and suggestions or want to offer your contributions, you can contact us at any time via the following email:
[email protected]. Thank you for making ZTE a part of your telecom experience! Maintenance Experience Editorial Committee Director: Chen Jianzhou Deputy Director: Zeng Li Technical Senior Editors: Hu Jia, Tao Minjuan, Zhang Jianping,Zhu Xiaopei Executive Editor: Zhang Fan Maintenance Experience Newsroom Address: ZTE Plaza,No. 55, Hi-tech Road South, ShenZhen, P.R.China Postal code: 518057 Contact: Ning Jiating Tel: +86-755-26776049 Fax: +86-755-26772236 Document support Email:
[email protected] Technical support website: http://ensupport. zte.com.cn Maintenance Experience Editorial Committee ZTE Corporation April , 2012 Contents Brief Introduction About uRPF............................................................................................................2 Active/Standby VRRP Switchover Failure on the ZXR10 6902 ..........................................................4 Base Station Offline Failure for a Loop in the Network of ZXR10 8902............................................... 6 ZXR10 T8000 Router Reflector Fails to Reflect VPN Routing Information.......................................... 8 FTP Service Failure for Incorrect MTU Setting in the MPLS Network................................................. 10 Interconnection Failure between M6000 and Transmission Devices ..................................................12 Active/standby Load Sharing Failure on Multiple Uplinks of the ZXR10 T600..................................... 15 IPTV Users Fails to Watch Programs after the Multicast Service of M6000 is Activated....................24 Charging Messages on the M6000 are Sent to Two Different Servers...............................................27 Routing Forward Table Failure for Incorrect BGP Synchronization Setting......................................... 28 FAQ.....................................................................................................................................................34 Technical Special Brief Introduction About uRPF Yang Zhiwei / ZTE Corporation 1 uRPF Overview Unicast Reverse Path Forwarding (uRPF) high-end products. switches, routers, and BRAS prevents the network attacks resulting from source address spoofing. The reverse path forwarding is relative to the normal path forwarding. After receiving packets, routers obtain destination addresses of packets and then find routes in accordance with the destination addresses. If the corresponding routes are found, packets will be forwarded. If the corresponding routes are not found, packets will be discarded. By obtaining source addresses and ingresses of packets, the uRPF function uses source addresses as destination addresses, and checks whether the interfaces corresponding to the source addresses in the forwarding table match ingresses. If the interface matching fails, it is considered that the source addresses are fake addresses. In this case, packets are discarded. With this method, the uRPF function can effectively protect the network from malicious attacks caused by source address modification. (1) Switch High-end switches support the uRPF function, but XG-line cards of G-series switches do not support the uRPF function. The configuration is as follows: Enable the URPF function in physical interface configuration mode: ZXR10(config-if)#ip verify {strict | loose} It is recommended to use the strict mode for all downstream interfaces, and the loose mode for all upstream interfaces. (2) T600/T1200 router All T600/T1200 routers support the uRPF function. The configuration is as follows: Enable the URPF function in physical interface configuration mode: ZXR10(config)#interface <interface-name> ZXR10(config-if)#ip verify {strict | loose} It is recommended to use the strict mode for all downstream interfaces, and the loose mode for all upstream interfaces. (3) M6000 router The M6000 router supports the uRPF function. The configuration is as follows: Downstream interfaces: 2 uRPF Configuration The following describes the uRPF function limitations and configurations on ZTE 2 ︱Maintenance Experience Issue 276 Sincere Service Method 1, configure the uRPF function in global configuration mode: ZXR10(config)#ipv4 source reachable-via <interface-name> Method 2, configure the uRPF function in interface configuration mode: ZXR10(config)#interface <interface-name> ZXR10(config-if)#ipv4 verify unicast source reachable-via rx verify rx unicast interface l on the BAS, the BAS does not forward packets. The VBUI interface of the BAS supports the uRPF function by default. 3 uRPF FAQ (1) Question: Is the uRPF function is limited by hardware or software versions of switches, routers, and BAS devices? Answer: All hardware (except the XG-line card of G-series switches) and the current popular versions support the uRPF function. (2) Question: Is the URPF function configured for physical interfaces or sub-interfaces? Do sub-interfaces inherit the URPF function of real interfaces? Answer: Physical interfaces are independent from sub-interfaces, so both physical interfaces and sub-interfaces should be configured with the URPF function. Real interfaces are independent from sub-interfaces, so sub-interfaces do not inherit the URPF function of real interfaces. (3) Question: Whether to enable the uRPF function on SmartGroup interfaces? Answer: The URPF function is enabled on SmartGroup interfaces of T600/T1200 /M6000. Upstream interfaces: Method 1, configure the uRPF function in global configuration mode: ZXR10(config)#ipv4 source reachable-via <interface-name> Method 2, configure the uRPF function in interface configuration mode: ZXR10(config)#interface <interface-name> ZXR10(config-if)#ipv4 verify unicast source reachable-via any verify any unicast interface (4) BAS device For users connected to VBUI interfaces of T600, T1200, and M6000 routers, a user table listing the relationship between the users and IP addresses exists on the Broadband Access Server (BAS). If a user IP address does not match that in the user table Data Products Special Issue Issue 1, 2013︱ 3 Maintenance Instances Active/Standby VRRP Switchover Failure on the ZXR10 6902 Zhang Jie / ZTE Corporation Abstract: This section describes the active/standby VRRP switchover failure between two 6902 devices. The analysis results show that this fault results from the incorrect VLAN setting for interfaces of the heartbeat line. Key words:6900, VRRP, active/standby switchover, VLAN, heartbeat line 1 Symptom As shown in Figure 1, two 6902 devices In general, 6902-1 is in Master status, and 6902-2 is in Backup status. If the link between 6902-1 and the corresponding downstream 2920 is broken, the VRRP active/standby switchover between 6902-1 and 6902-2 fails. In this case, 6902-1 is still in Master status, and 6902-2 is still in Backup status. act as convergent devices. The upstream interfaces of 6902 devices are connected to T64E, while the downstream interfaces of 6902 devices are connected to two 2920 switches that are enabled with the VRRP function. VRRP packets are transmitted through the heartbeat line between 6902-1 and 6902-2. 2 Fault Analysis (1) 6902-2 is still in Backup status. It is judged that 6902-1 still sends VRRP packets through the heartbeat line, and the data stream of the heartbeat line is normal after the downlink of 6902-1 is broken. To verify this conclusion, the engineer breaks the heartbeat line. The displayed result on 6902-2 is as follows: Figure 1. 6902 VRRP Active/Standby Network Diagram 4 ︱Maintenance Experience Issue 276 Sincere Service 6902-2(config)# l 11:10:42 03/14/2009 UTC alarm 512 occurred %PORT% Interface down on gei_1/2 sent by MEC 1 11:10:44 03/14/2009 UTC alarm 22016 occurred %VRRP% Group 1 of vlan10 changing to Master sent by MEC 1 The displayed result shows that 6902-1 still sends VRRP packets when its downlink is broken. All the above information shows that the fault results from 6902-1. (2) If 6902-1 finds that the interface used by the VRRP group is down, it stops sending VRRP packets, and then the VRRP active/standby switchover is performed. That is to say, 6902-1 does not find that the downlink is broken, or the downlink is still in UP status. Check the configuration of used interfaces, such as vlan10, in VRRP Group 1,. interface vlan 10 ip address 10.40.108.253 255.255.255.0 vrrp 1 priority 200 vrrp 1 out-interface gei_1/2 vrrp 1 ip 10.40.108.254 (3) Check the statuses of used interfaces, such as vlan10, in the VRRP group,. 6902-2(config)#show interface vlan10 vlan10 is up, line protocol is up (4) VLAN10 is in UP status, so 6902-1 still sends VRRP packets. Only one 2920 switch is connected to 6902-1, why VLAN10 is still in UP status? 6902-2(config)#show vlan id 10 VLAN Name 10 Status Said MTU IfIndex PvidPorts UntagPorts TagPorts gei_1/1-2 -----------------------------------------------------------------------VLAN0010 active 100010 1500 0 (5) The heartbeat egress is VLAN1. The heartbeat egress of 6902-2 belongs to another VLAN and there is no loop, but this configuration interferes with the normal operation of 6902-1. 3 Solution The problem is solved after interface gei_1/2 is deleted from VLAN10. 4 Conclusion The VRRP active/standby switchover is triggered by the VLAN protocol status of interfaces used by the VRRP group. After a heartbeat line is configured, you must ensure that the status of the downlink should be consistent with the VLAN protocol status of the corresponding interface. Data Products Special Issue Issue 1, 2013︱ 5 Maintenance Instances Base Station Offline Failure for a Loop in the Network of ZXR10 8902 Li Yong / ZTE Corporation Abstract: This section describes the offline fault of base stations caused by a loop. Key words: 8902, loop, base station offline, high-usage, SuperVLAN 1 Symptom ZXR10 8902 switch in a network acts as (3) Engineers turn on the MAC address floating switch of 8902. No MAC address floating alarm is generated. ZXR10(config)#mac mac-move enable logging-alarm a gateway, and tens of 2G or 3G base stations connected to the ZXR10 8902 switch are often offline. After telneting to this switch, engineers cannot execute any command properly. (4) Engineers observe the traffic of interfaces gei_2/19 and gei_2/20 connected to this switch. There is no obvious abnormality, and the increment of broadcast packets and multicasts are smooth. (5) When the out-of-band management interface gei_2/20 of this switch that connects to a L2 network device is disabled, engineers still cannot execute any command properly in Telnet mode, and the CPU usage of both the line card and the main control board is high. After that, engineers enable this interface. (6) When the out-of-band management interface gei_2/19 of this switch that connects to a L2 network device is disabled, engineers can execute all commands properly in Telnet mode, the CPU usage of both the line card and the main control board is normal. The pre-judgment result is that many packets exist in interface gei_2/19, so the CPU usage of 2 Fault Analysis (1) Engineers telnet to 8902 remotely and check device alarms. The OSPF connection between this switch and that of a central office interrupts frequently, and there is no rule. (2) The CPU usage of the only NP line card of this switch exceeds 80%, and the MP usage of the master main control board is up to 80%. The pre-judgment result is that there is a loop in the network. ZXR10#show logging alarm alarm 16901 occurred %OAM% CPU load exceeds the highest threshold 75% MP(M) panel 1 current CPU load is: 98% sent by MEC 1 6 ︱Maintenance Experience Issue 276 Sincere Service l 2 both the line card and the main control board is high. (7) Engineers enable interface gei_2/19 and then obtain CPU packets of the above line card by executing the capture command. The command is as follows: ARP Packet on NPC: 2 OP SND_MAC 1 1 1 1 1 1 SND_IP DST_MAC ZXR10(config)#capture readspeed 10 npc (8) Engineers enable interface gei_2/19 and then obtain the following information: DST_IP DIR Port 19 19 19 19 19 19 0000.5e00.0101 10.127.76.129 0000.5e00.0101 10.127.76.129 0000.5e00.0101 10.127.76.129 0000.5e00.0101 10.127.76.129 0000.5e00.0101 10.127.76.129 0000.5e00.0101 10.127.76.129 SND_IP 0000.0000.0000 255.255.255.255 RX 0000.0000.0000 255.255.255.255 RX 0000.0000.0000 255.255.255.255 RX 0000.0000.0000 255.255.255.255 RX 0000.0000.0000 255.255.255.255 RX 0000.0000.0000 255.255.255.255 RX DST_MAC DST_IP ARP Packet on NPC: 2 OP SND_MAC 1 1 1 1 1 1 1 1 1 1 1 DIR Port 19 19 19 19 19 19 19 19 19 19 19 0000.5e00.0101 10.127.76.129 0000.5e00.0101 10.127.76.129 0000.5e00.0101 10.127.76.129 0000.5e00.0101 10.127.76.129 0000.5e00.0101 10.127.76.129 0000.5e00.0101 10.127.76.129 0000.5e00.0101 10.127.76.129 0000.5e00.0101 10.127.76.129 0000.5e00.0101 10.127.76.129 0000.5e00.0101 10.127.76.129 0000.5e00.0101 10.127.76.129 SRC_IP 10.127.76.129 10.127.76.129 10.127.76.129 10.127.76.129 10.127.76.129 10.127.76.129 10.127.76.129 10.127.76.129 10.127.76.129 10.127.76.129 10.127.76.129 10.127.76.129 0000.0000.0000 255.255.255.255 RX 0000.0000.0000 255.255.255.255 RX 0000.0000.0000 255.255.255.255 RX 0000.0000.0000 255.255.255.255 RX 0000.0000.0000 255.255.255.255 RX 0000.0000.0000 255.255.255.255 RX 0000.0000.0000 255.255.255.255 RX 0000.0000.0000 255.255.255.255 RX 0000.0000.0000 255.255.255.255 RX 0000.0000.0000 255.255.255.255 RX 0000.0000.0000 255.255.255.255 RX IP Packet on NPC: 2 ProType DST_IP VRRP VRRP VRRP VRRP VRRP VRRP VRRP VRRP VRRP VRRP VRRP VRRP 224.0.0.18 224.0.0.18 224.0.0.18 224.0.0.18 224.0.0.18 224.0.0.18 224.0.0.18 224.0.0.18 224.0.0.18 224.0.0.18 224.0.0.18 224.0.0.18 OVID IVID TTL PRO SRCPN DSTPN DIR Port 1155 NULL 255 112 NULL 1154 NULL 255 112 NULL 1153 NULL 255 112 NULL 1152 NULL 255 112 NULL 1151 NULL 255 112 NULL 1150 NULL 255 112 NULL 1149 NULL 255 112 NULL 1148 NULL 255 112 NULL 1147 NULL 255 112 NULL 1146 NULL 255 112 NULL 1145 NULL 255 112 NULL 1144 NULL 255 112 NULL NULL NULL NULL NULL NULL NULL NULL NULL NULL NULL NULL NULL RX RX RX RX RX RX RX RX RX RX RX RX 19 19 19 19 19 19 19 19 19 19 19 19 Data Products Special Issue Issue 1, 2013︱ 7 Maintenance Instances (9) The printed information shows that interface gei_2/19 receives many ARP packets and VRRP protocol packets. The configuration shows that all source addresses of these packets are configured on a SuperVLAN interface of 8902, and interface SuperVLAN is enabled with the VRRP function. The printed OVID information is consistent with the SubVLAN information of the SuperVLAN interface. The SuperVLAN interface is the gateway for interface gei_2/19 connected with these offline base stations. The above result shows that the network where interface gei_2/19 is connected to has a loop. Packets sent from interface gei_2/19 by 8902 are also sent to interface gei_2/19, so the CPU usage of the line card is high. This OSPF connection is broken, so the base stations are often offline. 3 Solution The above analysis shows that there is a loop in the network. After going to the field, related engineers find that the loop is caused by the network cabling failure during the commissioning. The fault is solved after the loop is deleted. ZXR10 T8000 Router Reflector Fails to Reflect VPN Routing Information Fan Wei / ZTE Corporation Abstract: This section describes if T8000 that acts as a router reflector needs to reflect VPN routing information, the Route-Target attribute filtering function must be disabled. Key words: T8000, vpnv4, reflector, VRF, MPLS, Route-Target 1 Symptom As shown in Figure 1, T8000 acting as a established other. successfully, but these two M6000 devices cannot learn routes from each router reflector is connected to two M6000 devices, and runs L3 MPLS VPN services. After the Label Distribution Protocol (LDP) and VPNv4 are configured, the neighbour relationship of two M6000 devices is Figure 1. T8000 Router Reflector Topology 8 ︱Maintenance Experience Issue 276 Sincere Service l 2 Fault Analysis The possible reasons are as follows: (1) VPN route information is not notified. (2) The RT setting of two M6000 devices the Route-Target function must be disabled. If not, router reflectors will filter VRF RTs. In this case, the client cannot receive related information, so VRF routes of the peer end cannot be learnt. is incorrect. (3) T8000 does not forward VPN routes. (4) VPN routes are filtered. Perform the following steps to locate the fault: (1) Check the Label Distribution Protocol (LDP) forwarding table. The related labels are allocated properly. (2) After establishing the corresponding VRF on T8000, engineers find that M6000 devices can learn VRF routes from each other. Once when the VRF is deleted, VRF routes disappear. (3) The BGP protocol supports the MPLS-VPN application. For VPNv4 routes, the Route-Target attribute must be enabled. For router reflectors and inter-domain EBGPs, 3 Solution After the no bgp default route-target filter is executed in the BGP command configuration of T8000, two M6000 devices can learn VPN routes from each other. The fault is solved. 4 Conclusion During the router reflector configuration, the Route-Target attribute filtering function is enabled by default. To reflect related VPN route information, you need to execute the no bgp default route-target filter command to disable the Route-Target function. Data Products Special Issue Issue 1, 2013︱ 9 Maintenance Instances FTP Service Failure for Incorrect MTU Setting in the MPLS Network Li Jing / ZTE Corporation Abstract: The Maximum Transfer Unit (MTU) of an interface on a router is smaller than the length of a packet, so the FTP client cannot transfer files to the FTP server. This fault is solved after the MTU of an interface on the router is modified. Key words: MPLS, FTP, MTU, fragment 1 Symptom Most bearer networks use the MPLS 2 Fault Analysis (1) Engineers can successfully ping the network. In core networks, files, such as LOG files, are transferred between the FTP client and the FTP server through the MPLS network, as shown in Figure 1. Normally, the FTP client can successfully ping the IP address of the FTP server. However, files cannot be transferred even if the FTP client can successfully ping the FTP server. FTP server from the FTP client, which means that the VPN route is normal. (2) Files cannot be transferred when the FTP client can successfully ping the FTP server, which means that maybe the MTU setting is incorrect. Figure 1. FTP Service Failure for Incorrect MTU Setting in the MPLS Network 10 ︱Maintenance Experience Issue 276 Sincere Service l In general, the MTU for an interface of a network device, including the clients and the server in the core network, is set to 1500 bytes by default. When a packet passes through an MPLS network, two layers of TAG labels are added. The length of each TAG label is 4 bytes. In this case, the total bytes of a packet with 1500 bytes on the PE side become 1508 bytes, which exceeds the MTU that is set for an interface on the router. In this case, the packet is discarded. by the transmission device. You need to set the IP MTU of interfaces on routers to the default value (1500 bytes), and then set the IP MTU of the system to 1492 bytes on both the FTP client and the FTP server. In this case, the FTP service also becomes normal. 4 Conclusion The FTP service does not fragment a packet during the transmission. When a packet passes through an MPLS network, the packet will be discarded if the size of the packet exceeds the set IP MTU. When the service is invalid after the device route in a network is connected, you need to consider the setting of the IP MTU. 3 Solution After setting the IP MTU for interfaces on the network side of routers in the network to 1508 bytes, the FTP service becomes normal. If there is a transmission device between routers, and the IP MTU cannot be modified Data Products Special Issue Issue 1, 2013︱ 11 Maintenance Instances Interconnection Failure between M6000 and Transmission Devices Li Yunfeng / ZTE Corporation Abstract: This section describes the interconnection failure between M6000 and transmission devices. The analysis results show that the fault results from inconsistent V5 bytes. This fault is solved after the V5 byte is modified. Key words: M6000, CPOS, E1, transmission, interconnection 1 Symptom During the network reconstruction of one M6000 interconnects with and E1 links of each sub-company through the CPOS. However, the E1 link divided by the CPOS cannot interconnect with the E1 link of a sub-company successfully. company, transmission devices of other manufacturers Figure 1. Interconnection Between M6000 and Transmission Device through the CPOS 2 Fault Analysis (1) The network and router (including the successful, so the fault is unrelated to the router and its version. (2) The intermediate transmission devices are from the same manufacturer. The only difference is that the transmission device of this company is updated. Maybe the interconnection fault may result from the version) of this company are the same as those of the associated companies. The E1 interconnection in other networks is 12 ︱Maintenance Experience Issue 276 Sincere Service l parameter change after the update of the transmission device. (3) When executing the show controller cpos3-0/0/0/1 command on M6000, engineers find that the E1 interconnection of the CPOS high order path (AU4) is normal, but that of the lower order path (VC12) is unsuccessful. The detailed information are as follows: M6000#show controller e1 cpos3-0/0/0/1 au4 1 tug3 2 tug2 2 e1 1 Low order path: AU-4 1, TUG-3 2, TUG-2 2, C-12 1 Active Alarm: TIM History Alarm: AIS = 2 RDI = 2 LOP = 0 LOM = 2 TIM = 2 TIU = 2 SLM = 0 SLU = 0 PDI = 0 UNEQP = 0 Error : BIP2 = 0 LPREI(V5) = 16284 NEWPTR = 0 PSE = 0 NSE = 0 V5(TX): 0x01 V5(RX): 0x02 V5(EX): 0x01 J2(TX): "ZTE ZXR10 T8000" CRC-7 : 0xaf 5a 54 45 20 5a 58 52 31 30 20 54 38 30 30 30 J2(RX): "HuaWei SBS " CRC-7 : 0x96 48 75 61 57 65 69 20 53 42 53 20 20 20 20 20 J2(EX): "ZTE ZXR10 T8000" CRC-7 : 0xaf 5a 54 45 20 5a 58 52 31 30 20 54 38 30 30 30 E1 is down Work mode: unframed Clock source: internal Loopback: not set Active Alarm: NONE History Alarm: LOS = 0 AIS = 0 LOF = 0 RAI = 0 AISD = 0 CRCMLOF = 0 CRCMCRC = 0 CRCMCFEBE = 0 CRCMOOF = 0 CASMLOF = 0 CASMRMAI = 0 CASMAISD = 0 Error : FER = 0 CRCERR = 0 FEBE = 0 Data Products Special Issue Issue 1, 2013︱ 13 Maintenance Instances The above information shows that there are many lower-order path remote error indication (LPREI) errors on M6000. This alarm results from the inconsistency of V5 bytes of both devices. The above information shows that the V5 byte sent by the router is 0x01, but the V5 byte received from the peer end is 0x02. This is the reason why E1 interconnection fails. The modification commands on M6000 are as follows (010 in binary format is equal to 0x02 in Hex format): controller cpos3-0/0/0/1 framing sdh aug mapping au4 au4 1 tug3 1 mode e1 tug2 1 e1 1 flag v5 010 3 Solution Solution 1, Set the V5 byte of the 4 Conclusion During the interconnection from of devices different transmission device to 0x01 in order to be consistent with that of M6000. Solution 2, Set the V5 byte of M6000 to 0x02 in order to be consistent with that of the transmission device. transmission manufacturers, the parameter configuration must be consistent. 14 ︱Maintenance Experience Issue 276 Sincere Service l Active/standby Load Sharing Failure on Multiple Uplinks of the ZXR10 T600 Wang Lei / ZTE Corporation Abstract: The cost value calculated by the OSPF is the same, so the traffic passes through each uplink. In this case, the link with a wide bandwidth cannot be the master link, and the link with a narrow bandwidth cannot be a standby link. This fault is solved after the reference bandwidth that is used by the OSPF during calculating the cost value is modified. Key words: T600, OSPF, cost, reference bandwidth, active/standby link 1 Symptom As shown in Figure 1, the ZXR10 T600 BRAS of one area has six 1GE uplinks (black line). Two 10GE boards are added, that is to say, two 10G uplinks are added (red line). In this case, there are eight uplinks. It is hoped that the traffic is forwarded through two 10GE uplinks, and six 1GE uplinks are backup links. After the service cutover, the traffic passes through eight uplinks instead of the two 10GE uplinks. 2 Fault Analysis (1) Check the configuration of Figure 1. Topology of T600 with Multiple Uplinks T600-BRAS. The OSPF configuration is as follows: router ospf 100 router-id 10.20.252.77 maximum-paths 8 /* eight uplinks share the load*/ network 10.10.129.54 0.0.0.0 area 0.0.1.10 network 10.10.129.58 0.0.0.0 area 0.0.1.10 network 10.10.231.19 0.0.0.0 area 0.0.1.10 network 10.10.241.34 0.0.0.0 area 0.0.1.10 network 10.10.241.38 0.0.0.0 area 0.0.1.10 Data Products Special Issue Issue 1, 2013︱ 15 Maintenance Instances network 10.10.241.54 0.0.0.0 area 0.0.1.10 network 10.10.241.58 0.0.0.0 area 0.0.1.10 network 10.20.244.182 0.0.0.0 area 0.0.1.10 network 10.20.244.186 0.0.0.0 area 0.0.1.10 network 10.20.244.190 0.0.0.0 area 0.0.1.10 network 10.20.252.77 0.0.0.0 area 0.0.1.10 (2) When checking the cost value of the OSPF interface by executing the show ip ospf interface command, engineers find that the cost value of both 1GE ports and expanded 10GE ports is 1. ZXR10#show ip ospf interface OSPF Router with ID (10.20.252.77) (Process ID 100) xgei_3/1 is up Internet Address 10.10.129.54 255.255.255.252 enable Up for 8w0d In the area 0.0.1.10 POINT_TO_POINT Cost 1, Priority 1, Network Type point-to-point Transmit Delay(sec) 1, Authentication Type null Timer intervals(sec) : Hello 10, Dead 40, Retransmit 5 Number of Neighbors 1, Number of Adjacent neighbors 1 10.10.255.230 xgei_5/1 is up Internet Address 10.10.129.58 255.255.255.252 enable Up for 8w0d In the area 0.0.1.10 POINT_TO_POINT Cost 1, Priority 1, Network Type point-to-point Transmit Delay(sec) 1, Authentication Type null Timer intervals(sec) : Hello 10, Dead 40, Retransmit 5 Number of Neighbors 1, Number of Adjacent neighbors 1 10.10.255.231 gei_2/5 is up Internet Address 10.10.241.34 255.255.255.252 enable Up for 36w1d In the area 0.0.1.10 POINT_TO_POINT Cost 1, Priority 1, Network Type point-to-point Transmit Delay(sec) 1, Authentication Type null Timer intervals(sec) : Hello 10, Dead 40, Retransmit 5 Number of Neighbors 1, Number of Adjacent neighbors 1 16 ︱Maintenance Experience Issue 276 Sincere Service 10.10.255.231 gei_6/1 is up Internet Address 10.10.241.38 255.255.255.252 enable Up for 8w0d In the area 0.0.1.10 POINT_TO_POINT Cost 1, Priority 1, Network Type point-to-point Transmit Delay(sec) 1, Authentication Type null Timer intervals(sec) : Hello 10, Dead 40, Retransmit 5 Number of Neighbors 1, Number of Adjacent neighbors 1 10.10.255.230 gei_1/5 is up Internet Address 10.10.241.54 255.255.255.252 enable Up for 8w0d In the area 0.0.1.10 POINT_TO_POINT Cost 1, Priority 1, Network Type point-to-point Transmit Delay(sec) 1, Authentication Type null Timer intervals(sec) : Hello 10, Dead 40, Retransmit 5 Number of Neighbors 1, Number of Adjacent neighbors 1 10.10.255.230 gei_8/1 is up Internet Address 10.10.241.58 255.255.255.252 enable Up for 14w2d In the area 0.0.1.10 POINT_TO_POINT Cost 1, Priority 1, Network Type point-to-point Transmit Delay(sec) 1, Authentication Type null Timer intervals(sec) : Hello 10, Dead 40, Retransmit 5 Number of Neighbors 1, Number of Adjacent neighbors 1 10.10.255.231 gei_1/1 is up Internet Address 10.20.244.182 255.255.255.252 enable Up for 8w0d In the area 0.0.1.10 POINT_TO_POINT Cost 1, Priority 1, Network Type point-to-point Transmit Delay(sec) 1, Authentication Type null Timer intervals(sec) : Hello 10, Dead 40, Retransmit 5 Number of Neighbors 1, Number of Adjacent neighbors 1 10.10.255.231 gei_2/1 is up Data Products Special Issue Issue 1, 2013︱ l 17 Maintenance Instances Internet Address 10.20.244.186 255.255.255.252 enable Up for 8w0d In the area 0.0.1.10 POINT_TO_POINT Cost 1, Priority 1, Network Type point-to-point Transmit Delay(sec) 1, Authentication Type null Timer intervals(sec) : Hello 10, Dead 40, Retransmit 5 Number of Neighbors 1, Number of Adjacent neighbors 1 10.10.255.230 (3) The cost value is calculated by the automatic calculation formula in the OSPF protocol, that is to say, the ospf cost value (round down) of an interface is equal to 100/interface bandwidth. For the gei interface, the cost value is the round-off number of 0.1, that is to say, the cost value is 1. For the 10GE interface, the cost value is also the round-off number of 0.01, that is to say, the cost value is also 1. In this case, the cost value of interface gei and interface xgei is the router ospf 100 router-id 10.20.252.77 auto-cost reference-bandwidth 10000 maximum-paths 8 same, so the initial requirement cannot be met. 3 Solution You can execute the auto-cost reference-bandwidth <1-4000000> command to modify the reference bandwidth in the OSPF configuration and then modify the cost value. The configuration after the modification is as follows: /*adding a reference bandwidth*/ /* eight links share the load*/ network 10.10.129.54 0.0.0.0 area 0.0.1.10 network 10.10.129.58 0.0.0.0 area 0.0.1.10 network 10.10.231.19 0.0.0.0 area 0.0.1.10 network 10.10.241.34 0.0.0.0 area 0.0.1.10 network 10.10.241.38 0.0.0.0 area 0.0.1.10 network 10.10.241.54 0.0.0.0 area 0.0.1.10 network 10.10.241.58 0.0.0.0 area 0.0.1.10 network 10.20.244.182 0.0.0.0 area 0.0.1.10 network 10.20.244.186 0.0.0.0 area 0.0.1.10 network 10.20.244.190 0.0.0.0 area 0.0.1.10 network 10.20.252.77 0.0.0.0 area 0.0.1.10 Execute the show ip ospf interface command to check the port after the modification. The result is as follows: 18 ︱Maintenance Experience Issue 276 Sincere Service ZXR10#show ip ospf interface OSPF Router with ID (10.20.252.77) (Process ID 100) xgei_3/1 is up Internet Address 10.10.129.54 255.255.255.252 enable Up for 8w0d In the area 0.0.1.10 POINT_TO_POINT Cost 1, Priority 1, Network Type point-to-point Transmit Delay(sec) 1, Authentication Type null Timer intervals(sec) : Hello 10, Dead 40, Retransmit 5 Number of Neighbors 1, Number of Adjacent neighbors 1 10.10.255.230 xgei_5/1 is up Internet Address 10.10.129.58 255.255.255.252 enable Up for 8w0d In the area 0.0.1.10 POINT_TO_POINT Cost 1, Priority 1, Network Type point-to-point Transmit Delay(sec) 1, Authentication Type null Timer intervals(sec) : Hello 10, Dead 40, Retransmit 5 Number of Neighbors 1, Number of Adjacent neighbors 1 10.10.255.231 gei_2/5 is up Internet Address 10.10.241.34 255.255.255.252 enable Up for 36w1d In the area 0.0.1.10 POINT_TO_POINT Cost 10, Priority 1, Network Type point-to-point Transmit Delay(sec) 1, Authentication Type null Timer intervals(sec) : Hello 10, Dead 40, Retransmit 5 Number of Neighbors 1, Number of Adjacent neighbors 1 10.10.255.231 gei_6/1 is up Internet Address 10.10.241.38 255.255.255.252 enable Up for 8w0d In the area 0.0.1.10 POINT_TO_POINT Cost 10, Priority 1, Network Type point-to-point Transmit Delay(sec) 1, Authentication Type null Timer intervals(sec) : Hello 10, Dead 40, Retransmit 5 Number of Neighbors 1, Number of Adjacent neighbors 1 10.10.255.230 Data Products Special Issue Issue 1, 2013︱ l 19 Maintenance Instances gei_1/5 is up Internet Address 10.10.241.54 255.255.255.252 enable Up for 8w0d In the area 0.0.1.10 POINT_TO_POINT Cost 10, Priority 1, Network Type point-to-point Transmit Delay(sec) 1, Authentication Type null Timer intervals(sec) : Hello 10, Dead 40, Retransmit 5 Number of Neighbors 1, Number of Adjacent neighbors 1 10.10.255.230 gei_8/1 is up Internet Address 10.10.241.58 255.255.255.252 enable Up for 14w2d In the area 0.0.1.10 POINT_TO_POINT Cost 10, Priority 1, Network Type point-to-point Transmit Delay(sec) 1, Authentication Type null Timer intervals(sec) : Hello 10, Dead 40, Retransmit 5 Number of Neighbors 1, Number of Adjacent neighbors 1 10.10.255.231 gei_1/1 is up Internet Address 10.20.244.182 255.255.255.252 enable Up for 8w0d In the area 0.0.1.10 POINT_TO_POINT Cost 10, Priority 1, Network Type point-to-point Transmit Delay(sec) 1, Authentication Type null Timer intervals(sec) : Hello 10, Dead 40, Retransmit 5 Number of Neighbors 1, Number of Adjacent neighbors 1 10.10.255.231 gei_2/1 is up Internet Address 10.20.244.186 255.255.255.252 enable Up for 8w0d In the area 0.0.1.10 POINT_TO_POINT Cost 10, Priority 1, Network Type point-to-point Transmit Delay(sec) 1, Authentication Type null Timer intervals(sec) : Hello 10, Dead 40, Retransmit 5 Number of Neighbors 1, Number of Adjacent neighbors 1 10.10.255.230 20 ︱Maintenance Experience Issue 276 Sincere Service l Check the port traffic. The detailed information is as follows: ZXR10#show interface xgei_3/1 xgei_3/1 is up, line protocol is up MAC address is 00d0.d0c0.0320 The port is optical Duplex full ARP Timeout: 04:00:00 Internet address is 10.10.129.54/30 IP MTU 1500 bytes MRU 7600 bytes MTU 1600 bytes BW 10000000 Kbits 616702041Bps, 196551666Bps, 281997203Bps 49%, output Bytes 64B 15% 710654 pps 461783 pps Last clearing of "show interface" counters never 120 seconds input rate : 120 seconds output rate: Interface peak rate input Input: Packets : 6237211371020 : 5040435755736334 : 333351442209 Unicasts : 6237203196739 Broadcasts: 293290 65-127B : 1706566208851 256-511B : 118028738416 1024-1518B: 3620266192982 Oversize : 162806656 Output: Packets : 4873272205284 Bytes 64B : 2197434703453395 : 869560676016 Unicasts : 4873265252433 Broadcasts: 103 65-127B : 1995645961955 256-511B : 64218865493 1024-1518B: 1554051505129 ZXR10#show interface xgei_5/1 xgei_5/1 is up, line protocol is up MAC address is 00d0.d0c0.0320 The port is optical Duplex full ARP Timeout: 04:00:00 Internet address is 10.10.129.58/30 IP MTU 1500 bytes MRU 7600 bytes MTU 1600 bytes BW 10000000 Kbits Multicasts: 6952748 128-255B : 295637721093 512-1023B : 93262949507 Oversize : 894526091 Multicasts: 7880991 128-255B : 314313153568 512-1023B : 144522828338 Undersize : 0 CRC-ERROR : 0 Interface utilization : : input 725773412Bps,output Data Products Special Issue Issue 1, 2013︱ 21 Maintenance Instances Last clearing of "show interface" counters never 120 seconds input rate : 120 seconds output rate: Interface peak rate input Input: Packets : 5909167868576 Bytes 64B : 4765843744345818 : 311979849260 Unicasts : 5909159861800 Broadcasts: 293867 65-127B : 1626534764575 256-511B : 111511295278 1024-1518B: 3424957650589 Oversize : 107224174 Output: Packets : 5455649213711 Bytes 64B : 2460199055761584 : 982469129919 Unicasts : 5455642263119 Broadcasts: 118 65-127B : 2222358893314 256-511B : 73619528091 1024-1518B: 1735509368992 ZXR10#show interface gei_1/1 MAC address is 00d0.d0c0.0320 The port is optical Duplex full ARP Timeout: 04:00:00 Internet address is 125.45.244.182/30 IP MTU 1500 bytes MRU 7600 bytes MTU 1600 bytes BW 1000000 Kbits 530Bps, 533Bps, 63363842Bps 0%, output Bytes 64B 128-255B 0% 1 pps 1 pps Last clearing of "show interface" counters never 120 seconds input rate : 120 seconds output rate: Interface peak rate input Input: Packets : 1519036653750 : 1155108969461211 : 85063231893 : 83821966538 Unicasts : 1519020438964 Broadcasts: 525067 65-127B : 451390192631 Multicasts: 15689719 Interface utilization : : input 122247269Bps,output Multicasts: 6950474 128-255B : 332457557334 512-1023B : 106630120260 Oversize : 2604615801 /* Other GE ports are just similar*/ Multicasts: 7712909 128-255B : 297439240589 512-1023B : 136637845848 Undersize : 0 CRC-ERROR : 1737 Interface utilization : 294246049Bps 32%, output 17% : input 403812482Bps, 218689720Bps, 485311 pps 513997 pps 699525271Bps,output gei_1/1 is up, line protocol is up 22 ︱Maintenance Experience Issue 276 Sincere Service 256-511B : 26785522283 1024-1518B: 830237297111 Oversize : 45753245 Output: Packets : 1208948795938 Bytes 64B : 534669095751132 : 186289980847 : 76365658974 Unicasts : 1208932979755 Broadcasts: 134 65-127B : 526768727390 256-511B : 13593552803 1024-1518B: 380074304673 Multicasts: 15816049 128-255B 512-1023B : 41692690477 Undersize : 0 CRC-ERROR : 417 l 512-1023B : 25813774860 Oversize : 42796391 The above information shows that the traffic passes through two 10GE ports, and there is no traffic pass through the 1GE ports. The initial requirement is met. 4 Conclusion You need to master the application of the auto-cost reference-bandwidth command in the OSPF. You can execute this command to modify the reference bandwidth used by the OSPF during calculating the cost value as required. Data Products Special Issue Issue 1, 2013︱ 23 Maintenance Instances IPTV Users Fails to Watch Programs after the Multicast Service of M6000 is Activated Yun Yuejun / ZTE Corporation Abstract: This section describes that IPTV users cannot watch programs because the M6000 configuration is inconsistent with the T600 configuration. Key words: M6000, T600, IPTV, multicast, static 1 Symptom IPTV services of one area are activated, (1) The multicast route is steady, and it exists no matter multicast data exists or not. (2) The management on the multicast source and the multicast range is simple because the multicast route is steady. (3) No dynamic multicast route is established, so the delay is low during the first live program. The IPTV service allocates two accounts to users. One is the PPPoE account, which is used to obtain IP address, and the other is the IPTV platform account, which is used for the IPTV platform authentication. After two accounts are configured for the set-top box on the user side, the set-top box can be connected to the IPTV platform. and multicast duplication spots are set on BRAS nodes. 50 pilot programs are activated in advance. M6000 acts as the BRAS device, and connects to convergence switches. Convergence switches provide the access function to the Optical Line Terminal (OLT), Access Gateway (AG), and L2. M6000 acts as the BRAS device when it connects to the network for the first time, and the IPTV service is activated. New IPTV users can only watch programs on demand instead of live programs. Engineers configure the M6000 in accordance with theT600 configuration. But, IPTV pilot programs are activated in the T600 configuration. In accordance with the activation requirements of users, static multicast groups of 50 pilot programs activated in advance are configured on the BRAS device. Static multicast groups have the following advantages: 2 Fault Analysis (1) M6000 and metropolitan area networks (MANs) converge on the NE5000E side, and the PIMSM neighbour is normal. The mroute command shows that there are (*,G) and (S,G) items and multiple channels. 24 ︱Maintenance Experience Issue 276 Sincere Service l M6000#show ip pimsm neighbor Neighbor Address Interface 121.30.9.197 121.30.9.193 xgei-0/1/0/1 xgei-0/0/0/1 DR Priority 1 1 Uptime 18d10h 41d0h Expires 00:01:33 00:01:25 Ver V2 V2 M6000#show ip mroute (*, 226.0.2.41), RP: 218.26.134.127, TYPE: DYNAMIC, FLAGS: NS Incoming interface: xgei-0/1/0/1, flags: NS Outgoing interface list: vbui2, flags: F/S (10.112.2.69, 226.0.2.41), TYPE: DYNAMIC, FLAGS: Incoming interface: xgei-0/1/0/1, flags: Outgoing interface list: vbui2, flags: F/S (*, 226.0.2.42), RP: 218.26.134.127, TYPE: DYNAMIC, FLAGS: NS Incoming interface: xgei-0/1/0/1, flags: NS Outgoing interface list: vbui2, flags: F/S (10.112.2.69, 226.0.2.42), TYPE: DYNAMIC, FLAGS: Incoming interface: xgei-0/1/0/1, flags: Outgoing interface list: vbui2, flags: F/S (*, 226.0.2.43), RP: 218.26.134.127, TYPE: DYNAMIC, FLAGS: NS Incoming interface: xgei-0/0/0/1, flags: NS Outgoing interface list: vbui2, flags: F/S (10.112.2.68, 226.0.2.43), TYPE: DYNAMIC, FLAGS: Incoming interface: xgei-0/0/0/1, flags: Outgoing interface list: vbui2, flags: F/S (*, 226.0.2.44), RP: 218.26.134.127, TYPE: DYNAMIC, FLAGS: NS Incoming interface: xgei-0/0/0/1, flags: NS Outgoing interface list: vbui2, flags: F/S (10.112.2.68, 226.0.2.44), TYPE: DYNAMIC, FLAGS: Incoming interface: xgei-0/0/0/1, flags: Outgoing interface list: vbui2, flags: F/S (2) When checking the dialing information of the top-set box, the user finds that the bandwidth authentication is successful. When the top-set box is connected to the IPTV platform, the system prompts that the top-set Data Products Special Issue Issue 1, 2013︱ 25 Maintenance Instances box cannot be connected to the remote server. (3) The above information about M6000 shows that the bandwidth account of the user is online. (4) In general, the generated (*,G) and (S,G) items mean that multicast stream is sent properly. The IPTV service of all users connecting to the T600 device is normal. (5) The M6000 router is first used for China Unicom MAN, and engineers configure the IPTV service of T6000 in accordance with the T600 configuration. Engineers doubt that maybe the configuration mode of different software platforms is different. find that After the consultation, engineers subscriber-manage igmp service-profile 1 static-group 226.0.2.1 static-group 226.0.2.2 static-group 226.0.2.3 static-group 226.0.2.4 3 Solution It is not required to configure the static group joint function for the multicast on the user side. Static users are added to a group when they are online. A user can be added to multiple groups. In this case, heavy traffic will be sent to the user, so the packet will be discarded. To split static stream, execute the following commands: M6000#(config)#ip multicast-routing M6000#(config-mcast)#router igmp M6000#(config-mcast-igmp)#interface loopback1 M6000#(config-mcast-igmp-if-loopback 1)#static-group 226.0.2.1 M6000#(config-mcast-igmp-if-loopback 1)#static-group 226.0.2.2 M6000#(config-mcast-igmp-if-loopback 1)#static-group 226.0.2.3 M6000#(config-mcast-igmp-if-loopback 1)#static-group 226.0.2.4 configuration location of the static multicast group on M6000 is incorrect. The static multicast group on T600 is configured on the VBUI interface. interface vbui3 ip 255.255.254.0 ip pim sm ip igmp static-group 226.0.2.1 ip igmp static-group 226.0.2.2 ip igmp static-group 226.0.2.3 ip igmp static-group 226.0.2.4 address 10.143.206.1 The static multicast group on M6000 is configured on the interface of the user side, so users cannot watch IPTV programs. 26 ︱Maintenance Experience Issue 276 Sincere Service l Charging Messages on the M6000 are Sent to Two Different Servers Lv Zhongwei / ZTE Corporation Abstract: This section describes charging messages on M6000 are sent to two different servers. Key words: M6000, charging, RADIUS, copy to, domain name 1 Network Requirement The IP addresses of the current RADIUS servers in a network are 10.10.97.5 and 10.10.97.3. A new enabled service needs to copy the charging information in the abc.cn domain to 10.10.107.19. 2 Implementation Method Configure the ZXR10 M6000: /*Configure the source RADIUS group*/ radius authentication-group 1 server 1 10.10.97.5 master key 88----89 port 1645 server 2 10.10.97.3 key 88----89 port 1645 alias zradius deadtime 1 nas-ip-address 222.83.19.8 /*Configure a RADIUS copying group on the BRAS*/ radius accounting-group 100 server 1 10.10.107.19 key test port 1813 aaa-accounting-template 2 description Acct_zradius aaa-accounting-type radius accounting-radius-group first 1 second 100 /*Copy the charging information in the abc.cn domain to 10.10.107.19*/ accounting-template 2 description pppoe bind aaa-accounting-template 2 domain 1 bind accounting-template 2 alias abc.cn Data Products Special Issue Issue 1, 2013︱ 27 Maintenance Instances Routing Forward Table Failure for Incorrect BGP Synchronization Setting Xu Xiaoguang / ZTE Corporation Abstract: This section describes that routes fail to be forwarded because the BGP synchronization function is not disabled. Key words: BGP, synchronization, EBGP, IBGP, IGP 1 Symptom As shown in Figure 1, the routing forwarding table of one router is abnormal. Figure 1. DHCP Users Fail to Go Online 2 Fault Analysis The results show that BGP synchroni- router cannot notify the BGP routes learnt from the IBGP neighbor to its own EBGP neighbor. The BGP router notifies the BGP routes to the EBGP router except that these BGP routes exist in the IGP routing table. zation function in the current network is not disabled, so routing forward tables fail to be generated. The following analyzes the operations in cast that the BGP synchronization function is enabled or disabled: (1) Command explanation: The no synchronization command means that the BGP synchronization function is disabled. When the BGP synchronization function is disabled, the BGP router notifies network routes instead of waiting for the IGP synchronization. (2) Instructor explanation: When the BGP synchronization function is enabled, the BGP 3 Solution Configure the BGP on R3: R3#show running-config bgp ! <BGP> router bgp 200 redistribute connected neighbor 2.2.2.2 remote-as 200 neighbor 2.2.2.2 activate neighbor 2.2.2.2 next-hop-self neighbor 2.2.2.2 update-source loopback1 ! </BGP> 28 ︱Maintenance Experience Issue 276 Sincere Service l Check the local BGP routing table: R3(config)#show ip bgp route Status codes: *-valid, >-best, i-internal, s-stale Origin codes: i-IGP, e-EGP, ?-incomplete Dest *i *> *> *i *i *i *i 1.1.1.1/32 3.3.3.3/32 100.1.1.4/30 172.16.0.0/24 172.16.1.0/24 172.16.2.0/24 172.16.3.0/24 NextHop 2.2.2.2 3.3.3.3 100.1.1.6 2.2.2.2 2.2.2.2 2.2.2.2 2.2.2.2 Metric 100 0 0 100 100 100 100 200 200 200 200 LocPrf 200 RtPrf 100 i 0 ? 0 ? 100 i 100 i 100 i 100 i Path Check the local routing forward table: R3#show ip forwarding route IPv4 Routing Table: status codes: *valid, >best Dest *> 2.2.2.2/32 *> 3.3.3.3/32 *> 100.1.1.0/30 *> 100.1.1.4/30 *> 100.1.1.6/32 Gw 100.1.1.5 3.3.3.3 100.1.1.5 100.1.1.6 100.1.1.6 Interface gei-0/0/0/2 loopback1 gei-0/0/0/2 gei-0/0/0/2 gei-0/0/0/2 Owner ospf address ospf direct address Pri Metric 110 1 0 0 0 0 0 0 110 2 Change the configuration to no synchronization: R3(config)#show running-config bgp ! <BGP> router bgp 200 no synchronization redistribute connected neighbor 2.2.2.2 remote-as 200 neighbor 2.2.2.2 activate neighbor 2.2.2.2 next-hop-self neighbor 2.2.2.2 update-source loopback1 ! </BGP> The BGP routing table is added to the routing forward table. R3#show ip forwarding route IPv4 Routing Table: status codes: *valid, >best Dest *> 1.1.1.1/32 *> 2.2.2.2/32 Gw 100.1.1.5 100.1.1.5 Interface gei-0/0/0/2 gei-0/0/0/2 Owner bgp ospf Pri Metric 200 0 110 1 Data Products Special Issue Issue 1, 2013︱ 29 Maintenance Instances *> 3.3.3.3/32 *> 100.1.1.0/30 *> 100.1.1.4/30 *> 100.1.1.6/32 *> 172.16.0.0/24 *> 172.16.1.0/24 *> 172.16.2.0/24 *> 172.16.3.0/24 3.3.3.3 100.1.1.5 100.1.1.6 100.1.1.6 100.1.1.5 100.1.1.5 100.1.1.5 100.1.1.5 loopback1 gei-0/0/0/2 gei-0/0/0/2 gei-0/0/0/2 gei-0/0/0/2 gei-0/0/0/2 gei-0/0/0/2 gei-0/0/0/2 address ospf direct address bgp bgp bgp bgp 0 0 0 0 0 0 110 2 200 0 200 0 200 0 200 0 The above information shows that BGP routes can be added to the local routing forward table only when the synchronization function of the BGP route on R3 is disabled. In addition, during the EBGP route distribution between R2 and R1, EBGP routes of other ASs are added to the local routing forward table no matter the BGP synchronization function is disabled or not. router bgp 200 no synchronization redistribute connected network 33.33.33.33 255.255.255.255 neighbor 2.2.2.2 remote-as 200 neighbor 2.2.2.2 activate neighbor 2.2.2.2 next-hop-self neighbor 2.2.2.2 update-source loopback1 ! </BGP> Instructor explanation: When the BGP synchronization function is enabled, the BGP router cannot notify the BGP routes learnt from the IBGP neighbor to its own EBGP neighbor. The BGP router notifies the BGP routes to the EBGP router except that these BGP routes exist in the IGP routing table. The verification steps are as follows: Configure the BGP on R3: Configure the BGP on R2: router bgp 200 neighbor 3.3.3.3 remote-as 200 neighbor 3.3.3.3 activate neighbor 3.3.3.3 next-hop-self neighbor 3.3.3.3 update-source loopback1 neighbor 100.1.1.1 remote-as 100 neighbor 100.1.1.1 activate BGP routes on R2 are not added to the forwarding routing table. The details are as follows: R2#show ip bgp route Status codes: *-valid, >-best, i-internal, s-stale Origin codes: i-IGP, e-EGP, ?-incomplete 30 ︱Maintenance Experience Issue 276 Sincere Service Dest *> *i *i *i *i *> *> *> *> 1.1.1.1/32 3.3.3.3/32 33.33.33.33/32 100.1.1.4/30 100.1.1.8/30 172.16.0.0/24 172.16.1.0/24 172.16.2.0/24 172.16.3.0/24 NextHop 100.1.1.1 3.3.3.3 3.3.3.3 3.3.3.3 3.3.3.3 100.1.1.1 100.1.1.1 100.1.1.1 100.1.1.1 Metric 20 100 100 100 100 20 20 20 20 LocPrf 100 i 200 200 200 200 100 i 100 i 100 i 100 i ? i ? ? RtPrf Path l R2#show ip forwarding route IPv4 Routing Table: status codes: *valid, >best Dest *> 1.1.1.1/32 *> 2.2.2.2/32 *> 3.3.3.3/32 *> 4.4.4.4/32 *> 100.1.1.0/30 *> 100.1.1.2/32 *> 100.1.1.4/30 *> 100.1.1.5/32 *> 100.1.1.8/30 *> 172.16.0.0/24 *> 172.16.1.0/24 *> 172.16.2.0/24 *> 172.16.3.0/24 Gw 2.2.2.2 100.1.1.6 100.1.1.6 100.1.1.2 100.1.1.2 100.1.1.5 100.1.1.5 100.1.1.6 100.1.1.1 100.1.1.1 100.1.1.1 100.1.1.1 Interface 100.1.1.1 loopback1 gei-0/0/0/2 gei-0/0/0/2 gei-0/0/0/1 gei-0/0/0/1 gei-0/0/0/2 gei-0/0/0/2 gei-0/0/0/2 gei-0/0/0/1 gei-0/0/0/1 gei-0/0/0/1 gei-0/0/0/1 Owner bgp address static ospf direct address direct address ospf bgp bgp bgp bgp Pri Metric 20 0 1 0 0 0 0 20 20 20 20 0 0 0 0 0 0 0 0 0 0 0 gei-0/0/0/1 110 2 110 2 At the same time, R2 cannot notify route 33.33.33.33 distributed by R2 to the EBGP neighbor (R1) because the R2 routing table does not include route 33.33.33.33. This meets the synchronization enabling rule. The BGP table of R1 does not include route33.33.33.33: R1(config)#show ip bgp route Status codes: *-valid, >-best, i-internal, s-stale Origin codes: i-IGP, e-EGP, ?-incomplete Dest *> *> *> *> *> 1.1.1.1/32 3.3.3.3/32 100.1.1.4/30 100.1.1.8/30 172.16.0.0/24 NextHop 1.1.1.1 100.1.1.2 100.1.1.2 100.1.1.2 172.16.0.1 0 Metric 0 LocPrf 0 20 20 20 0 RtPrf i 200 ? 200 ? 200 ? i Path Data Products Special Issue Issue 1, 2013︱ 31 Maintenance Instances *> *> *> 172.16.1.0/24 172.16.2.0/24 172.16.3.0/24 172.16.1.1 172.16.2.1 172.16.3.1 0 0 0 0 0 0 i i i If the IGP table of R3 includes the 33.33.33.33 network segment that is distributed by the OSPF, add this network segment to R2, and then check whether R2 notifies route 33.33.33.33 to R1. R1#show ip forwarding route IPv4 Routing Table: status codes: *valid, >best Dest *> 1.1.1.1/32 *> 3.3.3.3/32 *> 33.33.33.33/32 *> 100.1.1.0/30 *> 100.1.1.1/32 *> 100.1.1.4/30 *> 100.1.1.8/30 *> 172.16.0.0/24 *> 172.16.0.1/32 *> 172.16.1.0/24 *> 172.16.1.1/32 *> 172.16.2.0/24 *> 172.16.2.1/32 *> 172.16.3.0/24 *> 172.16.3.1/32 Gw 1.1.1.1 100.1.1.2 100.1.1.2 100.1.1.1 100.1.1.1 100.1.1.2 100.1.1.2 172.16.0.1 172.16.0.1 172.16.1.1 172.16.1.1 172.16.2.1 172.16.2.1 172.16.3.1 172.16.3.1 Interface loopback1 gei-0/0/0/1 gei-0/0/0/1 gei-0/0/0/1 gei-0/0/0/1 gei-0/0/0/1 gei-0/0/0/1 loopback2 loopback2 loopback3 loopback3 loopback4 loopback4 loopback5 loopback5 Owner address bgp bgp direct address bgp bgp direct address direct address direct address direct address Pri Metric 0 20 20 0 0 20 20 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 4 Conclusion It is necessary to know the influence and even if these routes do not exist in its own IGP routing table. (2) In the IBGP neighbor, after the no synchronization command is executed, the BGP router adds the BGP routes to the local routing forward table instead of waiting for the IGP synchronization. After not need you to configure execute the the no synchronization command in the BGP, you do redistribut bgp-int/bgp-ext command in the IGP (such as OSPF). purpose on the current network when the synchronization function of the EBGP or IBGP is enabled or disabled. The understanding on the no synchronization command in the BGP is divided into two parts: (1) In the EBGP neighbor, after the no synchronization command is executed, the BGP router notifies the BGP routes learnt from the IBGP neighbor to its EBGP neighbor 32 ︱Maintenance Experience Issue 276 Sincere Service l In most cases, the IBGP routes and the IGP routes in the same AS are consistent. Once a route of other AS is added, and the EBGP neighbor is established, there are two selections. One is to distribute the BGP route to the IGP route protocol for the EBGP again, for example, execute the redistribut bgp-int/bgp-ext command in the OSP, and the other is to execute the no synchronization command for the EBGP or IBGP. In most networks, the synchronization function is disabled by default. The above details how to disable the synchronization function. In fact, it describes how the BGP route establishes an IP routing forward table. The following two methods can be used to establish an IP routing table. (1) Add an EBGP route to an IP routing table 1) In the BGP topology table, the EBGP route is considered as the optimized route. 2) If the same route that is learnt from other IGP or static routes exists, the administrative distance of BGP external routes is shorter than that of other routes. By default, the administrative distance of BGP external routes is 20, which is shorter than that of other dynamic routes (except that the administrative distance of the EIGRP summary route is 5). is In this case, the operation that R2 obtains inter-domain EBGP routes is not affected by the synchronization function of R2. All routes are added to the IP routing forward table. (2)Add the IBGP route to an IP routing table 1) This route must be the optimized BGP route. 2) Compared with other routes, this route the 3) optimized For the route IBGP based route, on the the IGP administrative distance. synchronization function must be considered. The IGP synchronization function in the router is enabled by default. When the IGP synchronization function is enabled, the BGP notifies route information to another ASs and adds the routes to the IP routing forwarding table till the IGP propagates the route information to its AS successfully. When all BGP routers in the AS are connected, the synchronization function can be disabled. On R3, the BGP routes are not added to the IP routing forward table because R2 is always waiting for the IGP synchronization. In most BGP networks, all IBGP are connected (or using RR), so the synchronization function is disabled. However, the synchronization function is enabled by default (the synchronization function of CISCO is disabled by default). Data Products Special Issue Issue 1, 2013︱ 33 FAQ FAQ Question: How does M6000 allocate ports to users when M6000 acts as the BAR and the nat444 service is enabled? Answer: The M6000 allocates ports to users with two modes, dynamic mode and static mode. Dynamic mode: After a user dials a number successfully, the M6000 allocates initial ports to the user. cgn-pool test poolid 1 pool-type port-range 128 performs other on-line services, initial ports are insufficient. In this case, M6000 continues allocating ports to the user. 128 ports are allocated to the user once a time, and the corresponding log is generated. Static mode: After a user dials a number successfully, the M6000 allocates fixed ports to the user. After all ports are used up, the M6000 will not allocate ports. After the user dials a number successfully, the M6000 allocates 1-128 ports to the user. When the user downloads software through the BT or Question: What is the difference between Address Translation and Address Proxy? Answer: Both the address translation technology and the address agent technology provide a private address to access the Internet. The difference is the location in the TCP/IP protocol stack. The address translation technology works in the network layer, while the address agent technology works in the application layer. The address translation technology is transparent to all applications, but the address agent technology must specify the IP address of an agent server in the application program. For example, when you access a Website through the address translation technology, you do not need to configure the browser. If you access a Website through the address Proxy technology, you need to configure the IP address of the Proxy in the browser. If the Proxy only supports the HTTP protocol, you can access the Website only through the address Proxy technology, and you cannot access the Website through the FTP. The above information shows that the address translation technology is better than the address Proxy technology because you do not need to configure the browser. 34 ︱Maintenance Experience Issue 276 Sincere Service l However, the address translation With the address Proxy technology, only the user whose user name and password are authenticated can access the Internet. technology cannot provide the authentication based on the user name and the password. Question: What is the size of the local-buffer configured in the RADIUS charging? Can you configure the size? What should you do when the buffer is full? Answer: The size of the local-buffer is 3072 messages, and the size cannot be configured. When the buffer is full, new messages can be saved to the buffer only after the messages stored in the buffer are sent out. Question: In the dual-server hot-backup system, the VRRP is used to determine the active/standby server. When the heartbeat line is broken, both servers are active VRRP. Whether the user online is affected when two BRASs are in active status? Answer: If the heartbeat line of the VRRP is broken, the heartbeat line will be in init status. Servers are independent, so the user online is not affected. After one server does not receive VRRP messages, it will become the active server after a period of time. In this case, maybe two servers are in active status. In this case, the server that gives a response to the user packet first forwards user data. The backup mode of the device is similar to the cold standby. Data Products Special Issue Issue 1, 2013︱ 35 Address: ZTE Plaza, No.55, Hi-tech Road South, Shenzhen, P.R.China Post code: 518057 Customer Support Hotline: +86-755-26771900 Tel:+86-755-26776049 Fax: +86-755-26772236 Customer Support Email:
[email protected] Technical Support Website: http://ensupport.zte.com.cn Publication Date: April 10, 2013