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| Troubleshooting Network Layer Problems |
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| What are network layer problems? |
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| Isolating the problem methodology |
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| Static routes, dynamic routing, summarization, redistribution, and combinations |
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| Troubleshooting Static Routes |
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| Static routes and classful lookups |
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| Static routes and intermediate addresses |
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| Static routes optimization with serial networks |
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| Static routes optimization with Ethernet networks |
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| Recurring static route installation and deletion |
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| Using discard routes |
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| Common IGP Routing Protocol Issues, Causes, and Solutions |
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| Introduction |
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| Missing or incorrect network or neighbor statement |
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| Layer 1 or 2 down |
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| Distribute-list in/out blocking |
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| Access list blocking |
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| Advertised network interface is down |
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| Passive interface |
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| Troubleshooting RIP |
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| Incompatible RIP version types |
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| Mismatched authentication key |
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| Reaches RIP hop count limit |
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| Discontiguous networks |
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| Flapping routes |
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| Large routing tables |
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| Troubleshooting EIGRP |
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| Mismatched K values |
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| Mismatched AS number |
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| Stuck in active – determining the problem |
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| Stuck in active – methodology for troubleshooting |
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| Stuck in active – the ultimate solution |
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| Duplicate router IDs |
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| EIGRP error messages |
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| Troubleshooting OSPF |
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| Mismatched parameters |
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| OSPF state issues |
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| One side of point-to-point link is unnumbered |
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| ABR not generating Type 4 summary LSA |
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| Forwarding address is not known through the intra-area or inter-area route |
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| Route summarization problems |
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| CPUHOG problems |
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| SPF calculation and route flapping |
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| Troubleshooting IS-IS |
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| IS-IS adjacency problems |
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| Some or all of the adjacencies are not coming up |
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| Adjacency is stuck in INIT state |
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| ES-IS adjacency instead of IS-IS adjacency formed |
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| Route advertisement problems |
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| Route flapping problem |
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| Troubleshooting BGP |
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| Troubleshooting BGP neighbor relationships |
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| Troubleshooting BGP route advertisements |
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| Troubleshooting routes not being installed in the IP routing table |
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| The BGP next hop is not reachable |
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| BGP routes getting dampened |
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| Troubleshooting outbound and inbound BGP policy issues |
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| Traffic takes a different interface than what is shown in routing table |
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| Troubleshooting Redistribution |
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| Redistribution problem with RIP |
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| Redistribution problems with EIGRP |
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| Redistribution problems with OSPF |
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| Redistribution problems with IS-IS |
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| Redistribution problems with BGP |
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