From: victor.oporto@empresas.telefonica.es
Date: Tue May 09 2006 - 09:24:59 ART
Hi, when the session is estabished, how do you see the routes to
the neighbors?, cause maybe when the session is stablished you're
receiving the route by bgp and for any reason, you don't have reacheable
the the next-hop... for example.
Saludos!
allboutcisco <frenzeus@streamyx.com>
Enviado por: nobody@groupstudy.com
09/05/2006 14:09
Por favor, responda a allboutcisco
Para: "Nawaz, Ajaz" <Ajaz.Nawaz@bskyb.com>, Cisco certification
<ccielab@groupstudy.com>
cc:
Asunto: Re: BGP stuck in OPENSENT/OPENCONFIRM
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
>>
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