ā04-09-2013 07:46 AM - edited ā03-07-2019 12:43 PM
I am learning more about ospf, but I have not come across this yet. I think this has something to do with the OSPF error that I see in my switch logs:
.Apr 9 14:40:40.893: %OSPF-4-DUP_RTRID_AREA: Detected router with duplicate router ID 192.168.33.12 in area 1
.Apr 9 14:41:01.101: %OSPF-4-FLOOD_WAR: Process 100 re-originates LSA ID 10.114.10.34 type-2 adv-rtr 192.168.33.12
ROUTER_SW1#sh ip ospf flood-list
OSPF Router with ID (192.168.33.12) (Process ID 100)
Anyone have any good input?
Thank you in advance
Solved! Go to Solution.
ā04-09-2013 08:01 AM
Ashley,
Your 1st problem is to find why you have 2 routers
in OSPF with the same ROUTER ID
That is what is generating
%OSPF-4-DUP_RTRID_AREA:
the second alarm is due to flooding of LSAs
%OSPF-4-FLOOD_WAR:
This wil be causing network instability.
Find the duplicate ROUTER ID asap.
Regards,
Alex.
Please rate useful posts.
ā04-09-2013 08:02 AM
Hello Ashley,
there are two routers using the SAME OSPF router-id in area 1 of your OSPF routing domain.
This is something to be fixed as soon as possible you need to change the OSPF router-id of one of them.
The two routers are both sending their own OSPF Router LSA with the same Link-id = Router-id continously and this is called a flood war.
see troubleshooting link for duplicated OSPF RIDs
http://www.cisco.com/en/US/tech/tk365/technologies_tech_note09186a0080117102.shtml
%OSPF-4-FLOOD_WAR: Process %d %s LSA ID %i type-%d adv-rtr %i in area %s
Router is extensively reoriginating or flushing the LSA reported by this error message.
the show ip ospf flood-list shows the list of OSPF LSAs to be flooded out in the area and it lists the affected Router LSA.
Hope to help
Giuseppe
ā04-09-2013 08:01 AM
Ashley,
Your 1st problem is to find why you have 2 routers
in OSPF with the same ROUTER ID
That is what is generating
%OSPF-4-DUP_RTRID_AREA:
the second alarm is due to flooding of LSAs
%OSPF-4-FLOOD_WAR:
This wil be causing network instability.
Find the duplicate ROUTER ID asap.
Regards,
Alex.
Please rate useful posts.
ā04-09-2013 08:13 AM
Thanks, but do you have any input on how to find the other router with that router ID? I tried to change the ip address of the interface but I am still getting the error.
ā04-09-2013 08:24 AM
Hi Ashley, you could follow this document.
http://www.cisco.com/en/US/tech/tk365/technologies_tech_note09186a0080117102.shtml
Do this on routers in the ospf area to determine the router-ID being used.
Show ip ospf
Should show you the router-ids in the first line.
E.g.
Router# show ip ospf
Routing Process "ospf 201" with ID 10.0.0.1 and Domain ID 10.20.0.1
Hope this helps
Sent from Cisco Technical Support iPhone App
ā04-09-2013 08:02 AM
Hello, You have a router with a duplicate router-id on the network - so please investigate this and stop the duplicated router-id
A. The error message is due to the some router that is flushing the network LSA because the network LSA received by the router whose LSA ID conflicts with the IP address of one of the router's interfaces and flushes the LSA out of the network. For OSPF to function correctly the IP addresses of transit networks must be unique. If it is not unique the conflicting routers reports this error message. In the error message the router with the OSPF router ID reported as adv-rtr reports this message.
http://www.cisco.com/en/US/tech/tk365/technologies_q_and_a_item09186a0080094704.shtml#wat
Hope this helps
Please rate useful posts and remember to mark any solved questions as answered. Thank you.
ā04-09-2013 08:02 AM
Hello Ashley,
there are two routers using the SAME OSPF router-id in area 1 of your OSPF routing domain.
This is something to be fixed as soon as possible you need to change the OSPF router-id of one of them.
The two routers are both sending their own OSPF Router LSA with the same Link-id = Router-id continously and this is called a flood war.
see troubleshooting link for duplicated OSPF RIDs
http://www.cisco.com/en/US/tech/tk365/technologies_tech_note09186a0080117102.shtml
%OSPF-4-FLOOD_WAR: Process %d %s LSA ID %i type-%d adv-rtr %i in area %s
Router is extensively reoriginating or flushing the LSA reported by this error message.
the show ip ospf flood-list shows the list of OSPF LSAs to be flooded out in the area and it lists the affected Router LSA.
Hope to help
Giuseppe
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