OSPF ISSUE

[olakunle06]

LEASE can someone help figure out what is wrong sometimes the routing  table is fully populated with ospf routes

and again there times i  would have only some network advertised,what could be the main  problemonce it happens like that i wont be able to reach remotes NEs

[Giuseppe Larosa]

Hello Olankule,

some notes follow:

I see that most routes are internal or inter area and they fall down all at the same time.

You can check with

sh ip ospf  neighbor detail

the uptime of each OSPF neighbor

you can check with

sh log

if you see any OSPF neighbor flapping over time

you may have a link so used that OSPF fails over it because neighbor doesn't see OSPF hellos.

What IOS platform are you using? Not all IOS routers have a system hidden queue for routing protocol messages, you may need to setup appropriate QoS to protect OSPF packets to give them some resources

check also interface counters on fas0/0 and fas0/1

Hope to help

Giuseppe