From: Jonathan V Hays (jhays@jtan.com)
Date: Sun Sep 14 2003 - 17:28:27 GMT-3
There were rumors that 12.2 would have BGP sync turned off by default.
However, this is not true on the version I am running, 12.2(17).
Do you know this is true for a fact, and if so which version?
Thanks,
Jonathan
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Kaiser Anwar
Sent: Saturday, September 13, 2003 7:03 PM
To: Jonathan V Hays; 'Paul Borghese'; 'yu chunyan';
ccielab@groupstudy.com
Subject: Re: alternative bgp no sync command
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
> >
> >
>
>_______________________________________________________________________
> >You are subscribed to the GroupStudy.com CCIE R&S Discussion Group.
> >
> >Subscription information may be found at:
> >http://www.groupstudy.com/list/CCIELab.html
> >
> >
>
>_______________________________________________________________________
> >You are subscribed to the GroupStudy.com CCIE R&S Discussion Group.
> >
> >Subscription information may be found at:
> >http://www.groupstudy.com/list/CCIELab.html
>
> _________________________________________________________________
> MSN 8 with e-mail virus protection service: 2 months FREE*
> http://join.msn.com/?page=features/virus
>
>
>
This archive was generated by hypermail 2.1.4 : Wed Oct 01 2003 - 07:24:27 GMT-3