From: Kaiser Anwar (kaiseranwar@sbcglobal.net)
Date: Sat Sep 13 2003 - 20:02:38 GMT-3
Hi getting back to the BGp sync issue again.I know Ios 12.2 ahs no sync
command by default. But can we still be tested in lab where we cant use the
no sync command. Thanks
Sincerely,
Kaiser Anwar
CCNA, CCNP
CCSA, MCSE
----- Original Message -----
From: "Jonathan V Hays" <jhays@jtan.com>
To: "'Paul Borghese'" <pborghese@groupstudy.com>; "'yu chunyan'"
<yuchunyan@hotmail.com>; <Kaiser_anwar@hotmail.com>;
<ccielab@groupstudy.com>
Sent: Friday, September 12, 2003 3:03 PM
Subject: RE: alternative bgp no sync command
> Paul,
>
> Respectfully, I must disagree. (I hope I'm still a list member after
> this post. ;-)
>
> Reconfiguring an AS with confederations *will* solve the BGP
> synchronization problem. Note that we are discussing CCIE lab scenarios
> here, not what might be reasonable in 'Real Life.'
>
> To review, when BGP Synchronization is turned ON, a router cannot
> advertise a BGP route to its iBGP neighbor (Internal BGP) unless the
> route is known by an IGP such as OSPF, RIP, ISIS, etc. This
> synchronization rule does *not* apply to eBGP (External BGP), which
> means that a router will indeed advertise a BGP route to its eBGP
> neighbor even if it is not known by an IGP. Reachability problems might
> ensue due to lack of an IGP route - but that's another issue.
>
> For example,suppose you have AS 100 consisting of R10, R20, and R30 with
> BGP sync turned ON and no supporting IGP. You can configure each router
> with its own confederation (each of which belongs to AS 100) to force
> the routers to advertise BGP routes to each other. The trick is that
> confederations run eBGP between each sub-AS, so if R10, R20, and R30 now
> below to sub-ASs (confederation autonomous systems) 65010, 65020, 65030
> they WILL advertise prefixes to each other, regardless of the existence
> of those prefixes in the IGP, just like 'real' eBGP connections.
>
> HTH,
>
> Jonathan
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> Paul Borghese
> Sent: Friday, September 12, 2003 1:27 PM
> To: 'yu chunyan'; Kaiser_anwar@hotmail.com; ccielab@groupstudy.com
> Subject: RE: alternative bgp no sync command
>
>
> I can not see how confederations would help eliminate a BGP SYNC problem
> ..
> if anything it will exasperate the problem.
>
> Take care,
>
> Paul
>
> -----Original Message-----
> From: yu chunyan [mailto:yuchunyan@hotmail.com]
> Sent: Friday, September 12, 2003 10:58 AM
> To: pborghese@groupstudy.com; Kaiser_anwar@hotmail.com;
> ccielab@groupstudy.com
> Subject: RE: alternative bgp no sync command
>
> confederation works here ?
>
> Bin
>
>
> >From: "Paul Borghese" <pborghese@groupstudy.com>
> >Reply-To: "Paul Borghese" <pborghese@groupstudy.com>
> >To: "'Kaiser Anwar'" <Kaiser_anwar@hotmail.com>,
> <ccielab@groupstudy.com>
> >Subject: RE: alternative bgp no sync command
> >Date: Fri, 12 Sep 2003 10:50:09 -0400
> >
> >Redistribute your BGP routes into your IGP protocol. With
> synchronization
> >enabled, BGP will not advertise routes to an EBGP speaker unless that
> route
> >is also known via the IGP protocol.
> >
> >Take care,
> >
> >Paul Borghese
> >
> >-----Original Message-----
> >From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> >Kaiser Anwar
> >Sent: Friday, September 12, 2003 10:18 AM
> >To: ccielab@groupstudy.com
> >Subject: alternative bgp no sync command
> >
> >Hi Group,
> > I have a question about no sync command for bgp.I was
> doing a
> >lab
> >with three routers running IBGP. I did not have the No sync command.
> > what would be the alternative to No sync for bgp. Thanks
> >
> >
> >Kaiser A
> >
> >
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