cancel
Showing results for 
Search instead for 
Did you mean: 
cancel
1290
Views
0
Helpful
23
Replies

OSPF bug on 7200

r-sinyuk
Level 1
Level 1

Hi everybody.

I have two Cisco 7200VXR routers connected via ATM-E3 link (PA-A3-E3 cards). Sometimes (approximately once per week) after link down/up flow (CRC level on ATM interface in this short time increase) I have a serious problems with OSPF.

Routers has established neighbor adjancencies:

bazilio>sh ip ospf neighbor

Neighbor ID Pri State Dead Time Address Interface

193.254.221.3 1 FULL/BDR 00:00:39 193.125.78.165 FastEthernet0/0.9

193.254.221.4 0 FULL/ - 00:00:35 193.125.78.82 ATM1/0.2

bazilio>

Routers has networks in link state fatabase:

bazilio>sh ip ospf database | inc 193.125.78.208

...

193.125.78.208 193.254.221.4 665 0x80000322 0x0013770

but has no same networks in routing table:

bazilio>sh ip route 193.125.78.208

% Network not in table

In this state OSPF may stay hours. The workaround is "clear ip ospf process" command. This takes place on all IOSes (including 123-3a).

Does anybody know how can I solve this problem ? Does migration from OSPF to EIGRP or IS-IS solve it ?

23 Replies 23

That looks like a bug to me. I would try changing to different code, perhaps the latest mainline 12.2 if it has the features you need.

Really, it looks like a bug. I forgot sad that "clear ip ospf process" command is not single solution. Sometimes at night, after link down/up flap event routes disappear from routing table, but some hours later, after second link down/up flap event routes appear in routing table again. I try to roll back to 12.2 IOS code.

I changed IOS to 122-15T2 one week ago. OSPF works correct!!!

But sometimes, my PA-A3-E3 ATM subinterface hangs

(ospf switches routes to backup interface). I use shutdown/no shutdown or clear interface atm1/0 as solution. But this is another story :)

Here's a shot in the dark - Is there a "distribute-list in" command that blocks that LSA from populating the routing table?

Mark

I have no any distribute-lists:

!

router ospf 1

log-adjacency-changes

area 0 authentication message-digest

summary-address 193.125.79.128 255.255.255.240

summary-address 10.21.0.0 255.255.0.0

redistribute connected subnets

redistribute static subnets

passive-interface default

no passive-interface FastEthernet0/0.9

no passive-interface ATM1/0.2

network 193.125.78.80 0.0.0.3 area 0

network 193.125.78.96 0.0.0.31 area 0

network 193.125.78.160 0.0.0.15 area 0

network 193.125.78.232 0.0.0.7 area 0

default-information originate

!

Yes. It is the external route. See my previous post.

I put configuration of both routers to

http://www.univ.kiev.ua/~roman/ospf/

mark-obrien
Level 4
Level 4

What is the subnet mask on your interface fastethernet0/0.9? If it overlaps with the the subnet mask for your external route in the LSA 193.125.78.208 advertised by 193.254.221.4 over your WAN link, OSPF may have problems and not run properly.

HTH

Mark

Fa0/0.9 has ip address 193.125.78.161 255.255.255.240, ATM1/0.2 193.125.78.81 255.255.255.252. It is not overlap.

Getting Started

Find answers to your questions by entering keywords or phrases in the Search bar above. New here? Use these resources to familiarize yourself with the community:

Innovations in Cisco Full Stack Observability - A new webinar from Cisco