Huawei ARG3 Router How To - Troubleshooting OSPF: Router ID Confusion
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This document discusses troubleshooting an OSPF routing protocol configuration issue where routers have an incorrect router ID. It describes checking connectivity and routing tables between routers, which reveal inconsistencies. The root cause is identified as Router A having the wrong router ID of 2.2.2.2 instead of its interface IP 1.1.1.1. The configuration is corrected by changing Router A's router ID, saving the changes, and rebooting Router A. Verification shows routing tables on Router C are now updated correctly.
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5. Checking OSPF neighborship on RouterA
Display OSPF
neighbors
05
RouteA has only one
peer OSPF that is
RouterC (Router ID:
3.3.3.3) in Area 1;
there is no information
about RouterB in Area
0.
RouterA ID seems to
be wrong because it is
2.2.2.2, so we have to
modify it.
Check OSPF neighborship on RouterA
<RouterA> display ospf peer
OSPF Process 1 with Router ID 2.2.2.2
Neighbors
Area 0.0.0.1 interface 10.1.1.1(GigabitEthernet0/0/0)'s neighbors
Router ID: 3.3.3.3 Address: 10.1.1.2
State: Full Mode:Nbr is Master Priority: 1
DR: 10.1.1.2 BDR: 10.1.1.1 MTU: 0
Dead timer due in 33 sec
Retrans timer interval: 5
Neighbor is up for 00:17:58
Authentication Sequence: [ 0 ]
Troubleshooting OSPF - Lesson 2: Router ID confusion
HUAWEI ARG3 ROUTER](https://image.slidesharecdn.com/huaweiarg3routerhowto-troubleshootingospf-lesson2routeridconfusion-150319113549-conversion-gate01/85/Huawei-ARG3-Router-How-To-Troubleshooting-OSPF-Router-ID-Confusion-6-320.jpg)
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6. Correcting OSPF configuration on RouterA
Configure the
right Router ID
(1.1.1.1)
06
Save the configuration
Correct Router ID, save configuration and reboot the system
[RouterA] router id 1.1.1.1
[RouterA] quit
<RouterA> save
The current configuration will be written to the device.
Are you sure to continue?[Y/N] y
<RouterA>reboot
Info: The system is now comparing the configuration, please wait.
Info: If want to reboot with saving diagnostic information, input 'N' and then ex
ecute 'reboot save diagnostic-information'.
System will reboot! Continue?[Y/N]:y
Feb 19 2015 15:48:24-08:00 RouterA %%01CMD/4/REBOOT(l)[5]:The user chos
e Y when d
eciding whether to reboot the system. (Task=co0, Ip=**, User=**)
<RouterA>
Reboot RouterA
Troubleshooting OSPF - Lesson 2: Router ID confusion
HUAWEI ARG3 ROUTER](https://image.slidesharecdn.com/huaweiarg3routerhowto-troubleshootingospf-lesson2routeridconfusion-150319113549-conversion-gate01/85/Huawei-ARG3-Router-How-To-Troubleshooting-OSPF-Router-ID-Confusion-7-320.jpg)
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7. Checking the routing table on RouterC
Check the routing
table on RouterC
to verify the
OSPF routes
07
[RouterC] disp ip routing-table
Route Flags: R - relay, D - download to fib
------------------------------------------------------------------------------
Routing Tables: Public
Destinations : 6 Routes : 6
Destination/Mask Proto Pre Cost Flags NextHop Interface
10.1.1.0/24 Direct 0 0 D 10.1.1.2 GigabitEthernet0/0/0
10.1.1.2/32 Direct 0 0 D 127.0.0.1 GigabitEthernet0/0/0
10.1.2.0/24 OSPF 10 2 D 10.1.1.1 GigabitEthernet0/0/0
10.1.3.0/24 OSPF 10 3 D 10.1.1.1 GigabitEthernet0/0/0
127.0.0.0/8 Direct 0 0 D 127.0.0.1 InLoopBack0
127.0.0.1/32 Direct 0 0 D 127.0.0.1 InLoopBack0
[RouterC]
Now we can see that
RouterC has learned
the route to network
10.1.3.0/24 via OSPF.
Troubleshooting OSPF - Lesson 2: Router ID confusion
HUAWEI ARG3 ROUTER](https://image.slidesharecdn.com/huaweiarg3routerhowto-troubleshootingospf-lesson2routeridconfusion-150319113549-conversion-gate01/85/Huawei-ARG3-Router-How-To-Troubleshooting-OSPF-Router-ID-Confusion-8-320.jpg)
Huawei ARG3 Router How To - Troubleshooting OSPF: Router ID Confusion
- 1. To learn more about this tutorial contact us [email protected] or visit our site www.ipmax.it/support WWW.IPMAX.IT Troubleshooting OSPF - Lesson 2: Router ID confusion HUAWEI ROUTER ARG3
- 2. To learn more about this tutorial contact us [email protected] or visit our site www.ipmax.it/support WWW.IPMAX.IT 1. General infos and application environment 01 Troubleshooting OSPF - Lesson 2: Router ID confusion HUAWEI ARG3 ROUTER OSPF is a routing protocol with some useful means of troubleshooting. Using the simple network scenario shown in the picture, we will describe how it is possible to detect and solve some common OSPF configuration error. This second lesson about OSPF troubleshooting will be focused on “Router ID confusion”. We will isolate the problem and we will correct the configuration.
- 3. To learn more about this tutorial contact us [email protected] or visit our site www.ipmax.it/support WWW.IPMAX.IT 2. Checking IP connectivity between RouterC and RouterD Ping RouterD 02 RouterD is unreachable from RouterC, so we have to chek RouterC routing table. Ping RouterD from RouterC <RouterC> ping 10.1.3.2 PING 10.1.3.2: 56 data bytes, press CTRL_C to break Request time out Request time out Request time out Request time out Request time out --- 10.1.3.2 ping statistics --- 5 packet(s) transmitted 0 packet(s) received 100.00% packet loss Troubleshooting OSPF - Lesson 2: Router ID confusion HUAWEI ARG3 ROUTER
- 4. To learn more about this tutorial contact us [email protected] or visit our site www.ipmax.it/support WWW.IPMAX.IT 3. Checking RouterC routing table Display the routing table 03 There is something strange in the routing table: only tne network 10.1.2.0/24 in Area 0 is known via OSPF, there is no information about network 10.1.3.0/24 in Area 2. Anayway the OSPF neighborship with RouterA seems to be OK, otherwise also network 10.1.2.0/24 would be not known to RouterC. So we can go on checking RouterA. Check RouterC routing table <RouterC> display ip routing-table Route Flags: R - relay, D - download to fib ------------------------------------------------------------------------------ Routing Tables: Public Destinations : 5 Routes : 5 Destination/Mask Proto Pre Cost Flags NextHop Interface 10.1.1.0/24 Direct 0 0 D 10.1.1.2 GigabitEthernet0/0/0 10.1.1.2/32 Direct 0 0 D 127.0.0.1 GigabitEthernet0/0/0 10.1.2.0/24 OSPF 10 2 D 10.1.1.1 GigabitEthernet0/0/0 27.0.0.0/8 Direct 0 0 D 127.0.0.1 InLoopBack0 127.0.0.1/32 Direct 0 0 D 127.0.0.1 InLoopBack0 Troubleshooting OSPF - Lesson 2: Router ID confusion HUAWEI ARG3 ROUTER
- 5. To learn more about this tutorial contact us [email protected] or visit our site www.ipmax.it/support WWW.IPMAX.IT 4. Checking RouterA routing table Display the routing table 04 There is something strange in the routing table: no networks are known to RouterA via OSPF. There is no information about network 10.1.3.0/24 in Area 2. So next step will be to check the neighborship status of RouterA with RouterB. Check RouterA routing table <RouterA> display ip routing-table Route Flags: R - relay, D - download to fib ------------------------------------------------------------------------------ Routing Tables: Public Destinations : 6 Routes : 6 Destination/Mask Proto Pre Cost Flags NextHop Interface 10.1.1.0/24 Direct 0 0 D 10.1.1.1 GigabitEthernet0/0/0 10.1.1.1/32 Direct 0 0 D 127.0.0.1 GigabitEthernet0/0/0 10.1.2.0/24 Direct 0 0 D 10.1.2.1 GigabitEthernet0/0/1 10.1.2.1/32 Direct 0 0 D 127.0.0.1 GigabitEthernet0/0/1 127.0.0.0/8 Direct 0 0 D 127.0.0.1 InLoopBack0 127.0.0.1/32 Direct 0 0 D 127.0.0.1 InLoopBack0 Troubleshooting OSPF - Lesson 2: Router ID confusion HUAWEI ARG3 ROUTER
- 6. To learn more about this tutorial contact us [email protected] or visit our site www.ipmax.it/support WWW.IPMAX.IT 5. Checking OSPF neighborship on RouterA Display OSPF neighbors 05 RouteA has only one peer OSPF that is RouterC (Router ID: 3.3.3.3) in Area 1; there is no information about RouterB in Area 0. RouterA ID seems to be wrong because it is 2.2.2.2, so we have to modify it. Check OSPF neighborship on RouterA <RouterA> display ospf peer OSPF Process 1 with Router ID 2.2.2.2 Neighbors Area 0.0.0.1 interface 10.1.1.1(GigabitEthernet0/0/0)'s neighbors Router ID: 3.3.3.3 Address: 10.1.1.2 State: Full Mode:Nbr is Master Priority: 1 DR: 10.1.1.2 BDR: 10.1.1.1 MTU: 0 Dead timer due in 33 sec Retrans timer interval: 5 Neighbor is up for 00:17:58 Authentication Sequence: [ 0 ] Troubleshooting OSPF - Lesson 2: Router ID confusion HUAWEI ARG3 ROUTER
- 7. To learn more about this tutorial contact us [email protected] or visit our site www.ipmax.it/support WWW.IPMAX.IT 6. Correcting OSPF configuration on RouterA Configure the right Router ID (1.1.1.1) 06 Save the configuration Correct Router ID, save configuration and reboot the system [RouterA] router id 1.1.1.1 [RouterA] quit <RouterA> save The current configuration will be written to the device. Are you sure to continue?[Y/N] y <RouterA>reboot Info: The system is now comparing the configuration, please wait. Info: If want to reboot with saving diagnostic information, input 'N' and then ex ecute 'reboot save diagnostic-information'. System will reboot! Continue?[Y/N]:y Feb 19 2015 15:48:24-08:00 RouterA %%01CMD/4/REBOOT(l)[5]:The user chos e Y when d eciding whether to reboot the system. (Task=co0, Ip=**, User=**) <RouterA> Reboot RouterA Troubleshooting OSPF - Lesson 2: Router ID confusion HUAWEI ARG3 ROUTER
- 8. To learn more about this tutorial contact us [email protected] or visit our site www.ipmax.it/support WWW.IPMAX.IT 7. Checking the routing table on RouterC Check the routing table on RouterC to verify the OSPF routes 07 [RouterC] disp ip routing-table Route Flags: R - relay, D - download to fib ------------------------------------------------------------------------------ Routing Tables: Public Destinations : 6 Routes : 6 Destination/Mask Proto Pre Cost Flags NextHop Interface 10.1.1.0/24 Direct 0 0 D 10.1.1.2 GigabitEthernet0/0/0 10.1.1.2/32 Direct 0 0 D 127.0.0.1 GigabitEthernet0/0/0 10.1.2.0/24 OSPF 10 2 D 10.1.1.1 GigabitEthernet0/0/0 10.1.3.0/24 OSPF 10 3 D 10.1.1.1 GigabitEthernet0/0/0 127.0.0.0/8 Direct 0 0 D 127.0.0.1 InLoopBack0 127.0.0.1/32 Direct 0 0 D 127.0.0.1 InLoopBack0 [RouterC] Now we can see that RouterC has learned the route to network 10.1.3.0/24 via OSPF. Troubleshooting OSPF - Lesson 2: Router ID confusion HUAWEI ARG3 ROUTER
- 9. To learn more about this tutorial contact us [email protected] or visit our site www.ipmax.it/support WWW.IPMAX.IT More Needs? Services and Solutions Products Remote IpService Security Via Ponchielli, 4 20063 Cernusco sul Naviglio (MI) – Italy +39 02 9290 9171 [email protected] About us IPMAX is the ideal partner for companies seeking quality in products and services. IPMAX guarantees method and professionalism to support its customers in selecting technologies with the best quality / price ratio, in the design, installation, commissioning and operation