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New Member

BGP error, need info..

Hi,

I have two routers with two different isps running BGP. The two routers running ibgp, each are getting routes from the outside just fine.

However, when connected together the router 2 does not seem to be able to keep all the routes that router 1 is trying to give him.

I keep showing the #1 & #2 router receive all the routes, and then slowly give them up. When I debug ip bgp updates on #2 I been getting:

*Oct 2 05:18:24: BGP(0): 66.90.64.50 write queue size of 205 exceeded limit of 100 messages

I have no sync on both sides (both are advertising a /19. Both have no auto-summary.

bgp looks like this:

neighbor <ip> remote-as <as>

neighbor <ip> next-hop-self

that's it pretty much.

both have a default route set statically with their isps.

Please someone shed some light on this for me :( Why doesn;t it keep the full 100K bgp table? Why does it go up/down? What does that error message mean and how do I fix it?

-GK

4 REPLIES
New Member

Re: BGP error, need info..

Hello,

What router model is it (e.g. 7507/RSP4) and how much DRAM do you have please?

New Member

Re: BGP error, need info..

cisco 7206VXR (NPE300) processor (revision B) with 229376K/65536K bytes of memory.

R7000 CPU at 262Mhz, Implementation 39, Rev 1.0, 2s56KB L2, 2048KB L3 Cache

6 slot VXR midplane, Version 2.0

Gold

Re: BGP error, need info..

It could be related to CSCdp63037:

>There appears to be a problem with us handling a "passive" BGP connection

>with a non-cisco peer. As a work around we have to apply an inbound

>access-list to the interface(s) that we use to connect to the peer. For

>the lab router that we were using I applied the following ACL:

>

>access-list 101 deny tcp host 154.16.1.1 any eq bgp

>access-list 101 deny tcp host 154.16.2.1 any eq bgp

>access-list 101 permit ip any any

>

>

>This ACL will deny any packets coming from the peer to port 179, causing

>us to always open the BGP session "Actively". We were then able to

>correctly open a session with peers 154.16.1.1 and 154.16.2.1.

Are there any !Cisco routers involved? I would try the workaround above to see if that fixes it.

http://www.cisco.com/cgi-bin/Support/Bugtool/onebug.pl?bugid=CSCdp63037

Russ.W

New Member

Re: BGP error, need info..

Thanks for the help Russ. You helped me yesterday with the 3 isp bgp problem with my XO. This is on that XO router.

I will try this tonight and see how it goes.

Our side is all Cisco gear :) I am unsure what the other side is using.

-GK

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