Two routing protocols using same rtr ID cause duplicate rtr id in EIGRP?

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Dec 31st, 2008
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Hi all,

I have observed logging of "Ignored route, dup router: 10.40.160.1"

in the EIGRP events in one of our L3 core switch. Both the OSPF & EIGRP seems to be using same router id:


4510-S1#sh ip eigrp topology

IP-EIGRP Topology Table for AS(29)/ID(10.40.160.1)


4510-S1#sh ip ospf data

OSPF Router with ID (10.40.160.1) (Process ID 100)


I know this (10.40.160.1) not being used anywhere in our network. OSPF being redistributed into EIGRP.


4510-S1#sh ip eigrp events

15 10:41:38.933 Poison squashed: 10.199.21.0/24 rt gone

16 10:41:38.933 RDB delete: 10.199.21.0/24 10.40.1.1

17 10:41:38.933 RDB delete: 10.199.21.0/24 10.40.2.1

18 10:41:38.933 RDB delete: 10.199.21.0/24 10.40.25.3

19 10:41:38.933 RDB delete: 10.199.21.0/24 10.40.11.1

26 10:41:38.933 Ignored route, neighbor info: 10.40.25.3 Vlan26

27 10:41:38.933 Ignored route, dup router: 10.40.160.1


No production issues anyway. But what causing the dup rtr id entries..?


Also what is the exxact meaning of:

Poison squashed: 10.199.21.0/24 rt gone


Thank you in advance

MS

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Giuseppe Larosa Wed, 12/31/2008 - 09:18
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Hello Mehboob,

I would investigate on neighbor 10.40.25.3 on Vlan26.


the EIGRP router-id is exported only on external routes data structures where there is a field where it is placed.


So the effect should be on a route imported in EIGRP on the neighbor 10.40.25.3


Hope to help

Giuseppe


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