Re: BGP Debug question (How to know what AS, neighbor is using

Hi Marko,

Thanks for your reply . I found below link interesting. So Answer is "NO"
. i.e There is no way to find this out via Debug Msg.. Hmmm :)

Thanks Joe/Marko for your efforts.

Regards,
PM
On Mon, Aug 10, 2009 at 3:22 PM, Marko Milivojevic <markom_at_markom.info>wrote:

> Sometime ago I wrote a troubleshooting article on this subject that
> you may find useful. Get it here:
>
>
> http://cisco.markom.info/2008/10/peering-with-unknown-autonomous-system.html
>
> --
> Marko
> CCIE #18427 (SP)
> My network blog: http://cisco.markom.info/
>
> On Mon, Aug 10, 2009 at 07:31, Joe Astorino<jastorino_at_ipexpert.com> wrote:
> > I wanted to follow up on this with the group. I think I misunderstood
> the
> > original question. So I think you are asking is there a way to know what
> the
> > incorrectly configured AS number is? There is no way I know of.
> >
> > R2(config-router)#do sh run | s bgp
> > router bgp 2
> > no synchronization
> > bgp log-neighbor-changes
> > neighbor 100.100.24.4 remote-as 99
> > no auto-summary
> >
> > router bgp 4
> > no synchronization
> > bgp log-neighbor-changes
> > neighbor 100.100.24.2 remote-as 2
> > no auto-summary
> >
> > R2(config-router)#
> > *Jul 11 00:18:42.815: %BGP-3-NOTIFICATION: sent to neighbor 100.100.24.4
> 2/2
> > (peer in wrong AS) 2 bytes 0004 FFFF FFFF FFFF FFFF FFFF FFFF FFFF FFFF
> 002D
> > 0104 0004 00B4 6464 1804 1002 0601 0400 0100 0102 0280 0002 0202 00
> >
> > R4(config-router)#
> > *Aug 10 09:31:46.319: %BGP-3-NOTIFICATION: received from neighbor
> > 100.100.24.2 2/2 (peer in wrong AS) 2 bytes 0004
> >
> > On Mon, Aug 10, 2009 at 2:57 AM, Joe Astorino <jastorino_at_ipexpert.com
> >wrote:
> >
> >> It actually tells you exactly what you need there. 0x0021 is the AS
> >> number. Convert that to decimal and you are all set. So in this case,
> >> 0x0021 = AS 33
> >>
> >>
> >>
> >> On Mon, Aug 10, 2009 at 2:16 AM, Pradeep Malik <pradeepmlk_at_gmail.com
> >wrote:
> >>
> >>> Hi All,
> >>>
> >>> My question is; what debug cmds could we use to find out AS that
> neighbor
> >>> has configured for my peering i.e If I am X.X.X.X and this statement
> is
> >>> at neighbor " bgp X.X.X.X remote-as Y" How to know AS Y ? If I
> >>> troubleshoot on my router, it only gives below notification and it
> shows
> >>> hexa decimal value of AS configred at my side but not on neighbor
> side..
> >>>
> >>> *Dec 9 14:25:00.010: %BGP-3-NOTIFICATION: received from neighbor
> >>> 150.2.3.254 2/2 (peer in wrong AS) 2 bytes 0021
> >>>
> >>> any suggestions ???
> >>>
> >>> Cheerz,
> >>> PM
> >>>
> >>>
> >>> Blogs and organic groups at http://www.ccie.net
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> >>>
> >>>
> >>>
> >>>
> >>>
> >>>
> >>>
> >>>
> >>
> >>
> >> --
> >> Regards,
> >>
> >> Joe Astorino - CCIE #24347 R&S
> >> Technical Instructor - IPexpert, Inc.
> >> Cell: +1.586.212.6107
> >> Fax: +1.810.454.0130
> >> Mailto: jastorino_at_ipexpert.com
> >>
> >
> >
> >
> > --
> > Regards,
> >
> > Joe Astorino - CCIE #24347 R&S
> > Technical Instructor - IPexpert, Inc.
> > Cell: +1.586.212.6107
> > Fax: +1.810.454.0130
> > Mailto: jastorino_at_ipexpert.com
> >
> >
> > Blogs and organic groups at http://www.ccie.net
> >
> > _______________________________________________________________________
> > Subscription information may be found at:
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Received on Mon Aug 10 2009 - 21:09:14 ART