Couldn't get Route

alsayed · ‎01-03-2008

hello

i have a couple of question:

1)if you can ping the next hope but u didn't receive route from the next hop Although both are under Ospf 1.here what the problen is?

2)what is the purpose of:

R5(config-if)#ip ospf mtu-ignore

10xs

s.arunkumar · ‎01-03-2008

1.Check if the next hop router is ur ospf neighbor.(It can ping b'cas its directly connected)

If ospf there,then any filtering by distribution-list or filtering out lsa at interface level done

2.This is 4 ignoring checking mismatch in mtu during DD packet exchange.By default its cheched and if mis-match is there then the ospf neiborship stuks between exstart and exchange states.

alsayed · ‎01-03-2008

10xs Freinds

bvsnarayana03 · ‎01-03-2008

1. Check if the 2 routers are OSPF neighbors "sh ip ospf nei".

2. OSPF checks whether neighbors are using the same MTU on a common interface. This check is performed when neighbors exchange Database Descriptor (DBD) packets. If the receiving MTU in the DBD packet is higher than the IP MTU configured on the incoming interface, OSPF adjacency will not be established. "mtu-ignore" command was introduced to turn off the MTU mismatch detection.