From: allboutcisco (frenzeus@streamyx.com)
Date: Tue May 09 2006 - 09:09:26 ART
Hi Nawaz,
There's an IGP running in between, so in terms of reachability - there
shouldn't be any issues. Did not try consistent ping, though i did try doing
some pings over it (re 100) but doesnt present any issues.
They're ebgp peers. But the funny thing is i tried all sorts, shut/no shut
interface, reloading the router & none of these seem to solve the problem.
But when i set it using Loopback interfaces as the source for ebgp peering,
it seemed to solve the problem. The peers do not go down (no notification
was sent/received from either peers).
I dont see any logic behind this. Though initially i too suspected that it
could be media issue, but connectivity doesnt seem to present any problem at
all. I could telnet from either router to each other, doesn't present any
issues.
Thanks.
Kenny
----- Original Message -----
From: "Nawaz, Ajaz" <Ajaz.Nawaz@bskyb.com>
To: "'allboutcisco'" <frenzeus@streamyx.com>; "Cisco certification"
<ccielab@groupstudy.com>
Sent: Tuesday, May 09, 2006 7:50 PM
Subject: RE: BGP stuck in OPENSENT/OPENCONFIRM
> Can you ping consistently across the link?
> Is this iBGP or eBGP neighbour?
> Have you tried setting up an IGP between the pair of routers?
> Attempt swapping the serial interfaces?
>
> Can only suspect it's a layer2 issue at the moment...
>
> Ajaz
>
>
>
> -----Original Message-----
> From: allboutcisco [mailto:frenzeus@streamyx.com]
> Sent: 09 May 2006 12:45
> To: Nawaz, Ajaz; Cisco certification
> Subject: Re: BGP stuck in OPENSENT/OPENCONFIRM
>
> Hi Nawaz,
>
> It's Serial, frame relay.
>
> Thanks.
>
>
>
> ----- Original Message -----
> From: "Nawaz, Ajaz" <Ajaz.Nawaz@bskyb.com>
> To: "'allboutcisco'" <frenzeus@streamyx.com>; "Cisco certification"
> <ccielab@groupstudy.com>
> Sent: Tuesday, May 09, 2006 6:46 PM
> Subject: RE: BGP stuck in OPENSENT/OPENCONFIRM
>
>
>>
>> What's the media type for transport between the two neighbors?
>>
>> Ajaz
>>
>>
>> -----Original Message-----
>> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
>> allboutcisco
>> Sent: 09 May 2006 11:00
>> To: Cisco certification
>> Subject: BGP stuck in OPENSENT/OPENCONFIRM
>>
>> Hi group,
>>
>> Has anyone ever experienced BGP neighbor formation, where the states of
>> one
>> end is in OPENSENT while the remote end is OPENCONFIRM?
>>
>> Initially the neighbor state at both ends reaches ESTABLISHED state, but
>> after about 2min+ a notification is sent by one of them, thereby closing
>> the
>> connection:
>> (154.1.0.3 ---- 154.1.0.5)
>>
>> %BGP-3-NOTIFICATION: sent to neighbor 154.1.0.3 4/0 (hold time expired) 0
>> bytes
>>
>> I did a further debug ip bgp & debug ip tcp transactions, noticed that
>> from
>> the debug output, all BGP capabilities were negotiated properly from the
>> receipt of the OPEN message, however one of the routers is reporting tcp
>> bad
>> segment. All else is at it's default, no acl, no change of tcp mss size
>> or
>> whatsoever at both routers interface.
>>
>> The following is part of the debug i collected:
>>
>> TCP0: bad seg from 154.1.0.5 -- outside window: port 179 seq 2431366053
>> ack
>> 3476515037 rcvnxt 2431366098 rcvwnd 16339 len 45
>> 154.1.0.3:179 <---> 154.1.0.5:17043 congestion window changes
>> cwnd from 1461 to 1460, ssthresh from 65535 to 2920
>> TCP0: timeout #1 - timeout is 3674 ms, seq 3476515037
>> TCP: (179) -> 154.1.0.5(17043)
>> TCP0: timeout #2 - timeout is 7348 ms, seq 3476515037
>> TCP: (179) -> 154.1.0.5(17043)
>> TCP0: Data repacketized, seq 3526658343, sent 298 byte
>>
>> U might need to repaste onto notepad.
>>
>> Any ideas? BGP neighbor is not forming..
>>
>> Thanks.
>>
>> Kenny
>>
>> _______________________________________________________________________
>> Subscription information may be found at:
>> http://www.groupstudy.com/list/CCIELab.html
>>
>> -----------------------------------------
>> Information in this email including any attachments may be
>> privileged, confidential and is intended exclusively for the
>> addressee. The views expressed may not be official policy, but the
>> personal views of the originator. If you have received it in error,
>> please notify the sender by return e-mail and delete it from your
>> system. You should not reproduce, distribute, store, retransmit,
>> use or disclose its contents to anyone.
>>
>> Please note we reserve the right to monitor all e-mail
>> communication through our internal and external networks.
>>
>> SKY and the SKY marks are trade marks of British Sky Broadcasting
>> Group plc and are used under licence. British Sky Broadcasting
>> Limited (Registration No. 2906991), Sky Interactive Limited
>> (Registration No. 3554332) and Sky Subscribers Services Limited
>> (Registration No. 2340150) are direct or indirect subsidiaries of
>> British Sky Broadcasting Group plc (Registration No. 2247735). All
>> of the companies mentioned in this paragraph are incorporated in
>> England and Wales and share the same registered office at Grant
>> Way, Isleworth, Middlesex TW7 5QD.
This archive was generated by hypermail 2.1.4 : Thu Jun 01 2006 - 06:33:21 ART