Big Routing could go wrong…OSPF

OSPF and Route redistribution:

Router#show ip ospf neighbors

Router#show ip ospf interface <- pay attention to the dead/hello timers

Router#show ip ospf database

Router#debug ip ospf adj / packets

Router#debug ip routing

Router#clear ip ospf process

•When redistribute routes between different routing protocol, pay attention to the seed metric. If do not set the seed metric, EIGRP/RIP will by default set the metric of routes from other routing protocol to be infinite; OSPF will by default set the metric of routes from other routing protocol to 20; BGP will keep the same metric value when routes enter BGP.
•When do full bi-directional route redistribution between 2 routing protocols, there could be route loop. So apply proper filters to limit the route.

If you find the above looks familiar, study the CCNP yourself, you might write some fancier ones 🙂

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