From: Victor Cappuccio (cvictor@protokolgroup.com)
Date: Wed May 10 2006 - 23:30:30 ART
Following Gians email, maybe this link also helps
http://www.cisco.com/en/US/tech/tk365/technologies_tech_note09186a0080093fb8
.shtml
Victor
-----Mensaje original-----
De: nobody@groupstudy.com [mailto:nobody@groupstudy.com] En nombre de
Gianpietro Lavado
Enviado el: Miircoles, 10 de Mayo de 2006 10:08 p.m.
Para: allboutcisco
CC: Cisco certification
Asunto: Re: BGP stuck in OPENSENT/OPENCONFIRM
Once I had a similar problem with two eBGP neighbors over FR; I was using
OSPF point-to-multipoint: the routers exchanged a /32 route for the directly
connected interface IP addresses as expected, but this made this addresses
'indirect' and forced me to use eBGP multihop for this directly connected
neighbors.
Maybe that's your case?
regards
Gianpietro
On 5/9/06, Nawaz, Ajaz <Ajaz.Nawaz@bskyb.com> wrote:
>
> I'd be interested to take a look at the running bgp config from both
> peers...
>
> Was it perhaps the attempt to multihop peer with directly connected
> neighbors using the connected intf IP addr?
>
> Ajaz
>
>
> -----Original Message-----
> From: allboutcisco [mailto:frenzeus@streamyx.com]
> Sent: 09 May 2006 13:09
> To: Nawaz, Ajaz; Cisco certification
> Subject: 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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