our backbone (6509) is connected to atm backbone (nortel passport) those are connected through gigaethernet interface and running ospf in area 0. One week ago we lost the ip connectivity between those backbones, the interfaces were in up but the neighbor relation fail and it was kept in LAODING STATE, according we the logs the neighbor relation fail becasue a BAD LSA was received (error messages %OSPF-4-ERRRCV:Bad LSU adv and %OSPF-4-BADLSATYPE:Invalid lsa:Bad LSA chksum Type 5 were received during the outage)
We check in cisco and this is quite normal behavior if we receive a bad LSA but the customer is asking why we have the same error message for long time and we didn't lost the neighbor relationship.
Somebody knows how many bad lsa we can receive before to lost the neighbor relationship.. or what kind of bag las can cause this behavior?? We receive two errors messages for bag lsa.. Somebody knows which is the different between those:
%OSPF-4-BADLSATYPE: Invalid lsa: Bad LSA chksum Type 5, Length 36, LSID 220.127.116.11 from 10.0.0.100, 10.10.3.1
%OSPF-4-ERRRCV: Received invalid packet: Bad LSU adv count from 10.10.3.241, GigabitEthernet1/21