From: Smith, Jason (JASmith@nuvox.com)
Date: Fri Jun 08 2007 - 10:41:21 ART
Yeah they all have the correct MTU and it works fine when the ring is
set to just regular broadcast. The issue comes up when it is configured
as point-to-multipoint
Thanks,
Jason Smith
CCIE #12097
-----Original Message-----
From: Marko Milivojevic [mailto:markom@vodafone.is]
Sent: Thursday, June 07, 2007 8:27 PM
To: Smith, Jason; ccielab@groupstudy.com
Subject: Re: OSPF Retransmissions
Make sure that all OSPF have the same MTU or configure "ip ospf
mtu-ignore"
on them.
Hey Group,
Has anybody seen a problem where you have ip ospf network
point-to-multipoint enabled (with OSPF neighbor statements) on an
interface that is actually in an ethernet broadcast segment and get the
error to many DBD retransmitions. The problem eventually solved itself
after many hours (after giving up on it) and all the neighbor
relationships came up but of course, that is unsat. The problem we
think it might be is that it is multicasting and unicasting out to its
neighbors at the same time and it might be causing problems. Seen a few
threads online where adding the non-broadcast keyword to the network
type actually fixed this problem. Would you agree to this or know of
any documentation that states this issue and the reason behind it.
Thanks for your help! Let me know if you have any questions.
Jun 2 20:26:32: %OSPF-5-ADJCHG: Process 11456, Nbr 0.0.0.0 on
GigabitEthernet4/0.100 from DOWN to DOWN, Neighbor Down: Ignore timer
expired
Jun 2 20:47:49: %OSPF-5-ADJCHG: Process 11456, Nbr 10.10.64.8 on
GigabitEthernet4/0.100 from EXSTART to DOWN, Neighbor Down: Too many DBD
retransmitions
Jun 2 20:48:49: %OSPF-5-ADJCHG: Process 11456, Nbr 0.0.0.0 on
GigabitEthernet4/0.100 from DOWN to DOWN, Neighbor Down: Ignore timer
expired
Jun 2 20:50:02: %OSPF-5-ADJCHG: Process 11456, Nbr 10.10.64.8 on
GigabitEthernet4/0.100 from EXSTART to DOWN, Neighbor Down: Too many DBD
retransmitions
interface GigabitEthernet4/0.100
description [internal]_Connects to_RPR#1
encapsulation dot1Q 100
ip address 10.10.252.4 255.255.255.224
no ip directed-broadcast
ip ospf network point-to-multipoint
ip ospf cost 10
ip ospf hello-interval 7
ip ospf dead-interval 21
ip ospf mtu-ignore
mpls label protocol ldp
tag-switching ip
service-policy output CORE-ONS
router ospf 11456
log-adjacency-changes
no auto-cost
area 0 authentication
passive-interface Loopback9
network 10.10.252.0 0.0.0.31 area 0
network 10.10.253.0 0.0.0.31 area 0
neighbor 10.10.253.1 cost 21
neighbor 10.10.253.11 cost 21
neighbor 10.10.253.2 cost 17
neighbor 10.10.253.12 cost 17
neighbor 10.10.253.7 cost 20
neighbor 10.10.253.17 cost 20
neighbor 10.10.253.8 cost 16
neighbor 10.10.253.18 cost 16
neighbor 10.10.253.5 cost 11
neighbor 10.10.253.15 cost 11
neighbor 10.10.253.14 cost 10
neighbor 10.10.252.18 cost 16
neighbor 10.10.252.8 cost 16
neighbor 10.10.252.17 cost 20
neighbor 10.10.252.2 cost 17
neighbor 10.10.252.5 cost 11
neighbor 10.10.252.12 cost 17
neighbor 10.10.252.11 cost 21
neighbor 10.10.252.1 cost 21
neighbor 10.10.252.15 cost 11
neighbor 10.10.252.7 cost 20
neighbor 10.10.252.14 cost 10
maximum-paths 8
default-metric 1
distribute-list route-map OSPF_ROUTES in
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