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Any Questions?. Chapter 11 Troubleshooting Routing Protocols. Perspectives on Troubleshooting Routing Protocol Problems Interfaces Enabled with a Routing Protocol Neighbor Relationships. Troubleshooting Routing Protocols. Start with Routing Table If you know the network architecture

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  1. Any Questions?

  2. Chapter 11 Troubleshooting Routing Protocols • Perspectives on Troubleshooting Routing Protocol Problems • Interfaces Enabled with a Routing Protocol • Neighbor Relationships

  3. Troubleshooting Routing Protocols • Start with Routing Table • If you know the network architecture • If you know what should be in table • Look for Missing Routes Pg 409

  4. Looking at Routing • Step 1 Examine the internetwork design to determine on which interfaces the routing protocol should be enabled and which routers are expected to become neighbors. • Step 2 Verify whether the routing protocol is enabled on each interface (as per Step 1). If it isn’t, determine the root cause and fix the problem. • Step 3 Verify that each router has formed all expected neighbor relationships. If it hasn’t, find the root cause and fix the problem. Pg 410

  5. Routing Network Command • For any interfaces matched by the network commands, the routing protocol tries the following two actions: • Attempt to find potential neighbors on the subnet connected to the interface • Advertise the subnet connected to that interface • passive-interface router subcommand • router does not attempt to find neighbors on the interface (the first action just listed) • advertises the connected subnet (the second action) Pg 410

  6. Any Questions?

  7. Useful Show Commands Pg 410

  8. Looking Up Routing Protocols • R1>show ip eigrp interfaces • IP-EIGRP interfaces for process 99 • Xmit Queue Mean Pacing Time Multicast Pending • Interface Peers Un/Reliable SRTT Un/Reliable Flow Timer Routes • Fa0/0 2 0/0 620 0/10 50 0 • Fa0/1 0 0/0 0 0/10 0 0 Pg 412

  9. Show Ip protocols R2>show ip protocols Routing Protocol is “eigrp 99” Outgoing update filter list for all interfaces is not set Incoming update filter list for all interfaces is not set Default networks flagged in outgoing updates Default networks accepted from incoming updates EIGRP metric weight K1=1, K2=0, K3=1, K4=0, K5=0 EIGRP maximum hopcount 100 EIGRP maximum metric variance 1 Redistributing: eigrp 99 EIGRP NSF-aware route hold timer is 240s Automatic network summarization is in effect Maximum path: 4 Routing for Networks: 10.0.0.0 Routing Information Sources: Gateway Distance Last Update 10.1.1.3 90 00:13:25 10.1.1.1 90 00:13:25 Distance: internal 90 external 170 Pg 412

  10. EIGRP Example Pg 411

  11. Problems on Router3 R3#show running-config ! lines omitted for brevity router eigrp 99 network 10.1.1.3 0.0.0.0 network 10.1.13.3 0.0.0.0 auto-summary R3#show ip eigrp interfaces IP-EIGRP interfaces for process 99 Xmit Queue Mean Pacing Time Multicast Pending Interface Peers Un/Reliable SRTT Un/Reliable Flow Timer Routes Fa0/0 2 0/0 1 0/10 50 0 Pg 415

  12. Any Questions?

  13. Troubleshooting Neighbor relationships Pg 418

  14. Checking IP Neighbors R1#show ip eigrp neighbors IP-EIGRP neighbors for process 99 H Address Interface Hold Uptime SRTT RTO Q Seq (sec) (ms) Cnt Num 2 10.1.1.3 Fa0/0 13 00:00:04 616 3696 0 8 1 10.1.1.4 Fa0/0 12 00:00:54 1 200 0 45 0 10.1.1.2 Fa0/0 14 00:01:19 123 738 0 43 Pg 419

  15. Checking Neighbor Relationships Pg 420

  16. OSPF Neighbors • R2#show ip ospf neighbor • Neighbor ID Pri State Dead Time Address Interface • 1.1.1.1 1 FULL/BDR 00:00:37 10.1.1.1 FastEthernet0/0 • 3.3.3.3 1 2WAY/DROTHER 00:00:37 10.1.1.3 FastEthernet0/0 • 4.4.4.4 1 FULL/DR 00:00:31 10.1.1.4 FastEthernet0/0 Pg 422

  17. OSPF Neighbor Commands Pg 423

  18. Any Questions?

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