Re: [BGP] header synchronization problems

Is this on dynamips? I have heard of this problem. I think it happens to do
with alignment of the marker field. Nevertheless, read this if you are
running dynamips:

http://7200emu.hacki.at/viewtopic.php?p=21248&sid=322e7635eab61a35667804fa46e99bee

On Sat, Jun 27, 2009 at 12:46 AM, Jerry Chan <temjin1997_at_gmail.com> wrote:

> Hi all,
>
> It's forming a BGP peer, however, it appear BGP flapping with the following
> massage.
>
> *Jun 27 14:05:02.219: %BGP-3-NOTIFICATION: received from neighbor 10.10.7.7
> 1/1 (header synchronization problems) 0 bytes
> *Jun 27 14:05:02.223: %BGP-5-ADJCHANGE: neighbor 10.10.7.7 Down BGP
> Notification received
> *Jun 27 14:05:23.503: %BGP-5-ADJCHANGE: neighbor 10.10.7.7 Up
> The configuraiton just like this :
>
> R6
> =========
> router bgp 267
> bgp router-id 10.10.6.6
> no bgp default ipv4-unicast
> bgp log-neighbor-changes
> neighbor 10.10.7.7 remote-as 267
> neighbor 10.10.7.7 update-source Loopback0
> !
> address-family ipv4
> neighbor 10.10.7.7 activate
> neighbor 10.10.7.7 send-community both
> neighbor 10.10.7.7 route-reflector-client
> neighbor 10.10.7.7 next-hop-self
> no auto-summary
> no synchronization
> exit-address-family
> !
>
> R7
> =========
> router bgp 267
> bgp router-id 10.10.7.7
> no bgp default ipv4-unicast
> bgp log-neighbor-changes
> neighbor 10.10.6.6 remote-as 267
> neighbor 10.10.6.6 update-source Loopback0
> !
> address-family ipv4
> neighbor 10.10.6.6 activate
> neighbor 10.10.6.6 send-community both
> neighbor 10.10.6.6 next-hop-self
> no auto-summary
> no synchronization
> exit-address-family
> it make me crazy that it is a normal connection..
> Please kinldy to help if you have any finding.
>
> Thanks,
> Jerry
>
>
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-- 
Bryan Bartik
CCIE #23707 (R&S), CCNP
Sr. Support Engineer - IPexpert, Inc.
URL: http://www.IPexpert.com
Blogs and organic groups at http://www.ccie.net