[j-nsp] Receiving our own OSPF LSA...

[Paul Goyette]

Two routers with the same ID in the network?

Paul Goyette
Juniper Networks Customer Service
JTAC Escalation Engineer and
Security Incident Response Team 
PGP Key ID 0x53BA7731 Fingerprint:
  FA29 0E3B 35AF E8AE 6651
  0786 F758 55DE 53BA 7731 

> -----Original Message-----
> From: juniper-nsp-bounces at puck.nether.net 
> [mailto:juniper-nsp-bounces at puck.nether.net] On Behalf Of Jee Kay
> Sent: Saturday, November 04, 2006 4:08 PM
> To: juniper-nsp at puck.nether.net
> Subject: [j-nsp] Receiving our own OSPF LSA...
> Importance: High
> 
> I am increasingly getting this on a couple of routers in a remote part
> of the network... it's causing the router to revoke its own Router LSA
> (age 3600, flood), then readvertising it about 2 seconds later. At no
> point are any neighbours lost.
> 
> I can't for the life of me see why this would be happening but it
> clearly is. I've checked for duplicate router IDs around the network
> and there aren't any... has anyone seen anything like this before?
> 
> Nov  3 14:38:43 OSPF rcvd LSUpdate dr-on-network -> 224.0.0.6
> (ge-1/3/0.265, IFL 0x47)
> Nov  3 14:38:43   Version 2, length 112, ID dr-router-id, area 0.0.0.0
> Nov  3 14:38:43   checksum 0x0, authtype 0
> Nov  3 14:38:43   adv count 1
> Nov  3 14:38:43 OSPF LSA Router problem-router-id problem-router-id
> from dr-on-network newer than db
> Nov  3 14:38:43   Our LSA
> 
> Nov  3 14:38:43 ospf_set_lsdb_state: Router LSA problem-router-id
> adv-rtr problem-router-id state QUIET->GEN_PENDING
> 
> 
> It then schedules a full SPF and basically removes itself from the
> network completely for a few seconds. Needless to say, this is causing
> us some problems.
> 
> Googling isn't really giving me much, and the chaps at the other end
> of my JTAC line aren't being as useful as they usually are.
> 
> Thanks in advance,
> Ras
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