From: Ken Yeo (kenyeo@xxxxxxxxxxxxxxx)
Date: Tue May 08 2001 - 13:03:35 GMT-3
Hi Andrew,
In lab environment, if not all transit routers ran BGP and no syncronization
is enable. We will experience black hole routes. In this case we have to
redistribute BGP into IGP.
Thanks,
Ken Yeo
----- Original Message -----
From: "Andrew Lennon" <andrew.lennon@nscglobal.com>
To: "Ken Yeo" <kenyeo@on-linecorp.com>; "Brian Dennis" <brian@5g.net>;
<ccielab@groupstudy.com>
Sent: Thursday, May 03, 2001 5:47 PM
Subject: RE: BGP and no-sync
> I would hope that company IT processes would stop anyone making such a
> plonker of themselves, but then again....
>
> Seriously there was a thread a few weeks ago that covered the sync/no sync
> issue quite well. In short:
>
> Learn what your IGP's can and can't do!
>
> Andy
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
> Ken Yeo
> Sent: 03 May 2001 22:46
> To: Brian Dennis; ccielab@groupstudy.com
> Subject: Re: BGP and no-sync
>
>
> Hi Brian,
>
> Very agree!
>
> Ken
> ----- Original Message -----
> From: "Brian Dennis" <brian@5g.net>
> To: <ccielab@groupstudy.com>
> Sent: Thursday, May 03, 2001 2:52 PM
> Subject: RE: BGP and no-sync
>
>
> > You redistribute a full Internet routing table without any filtering
into
> > your IGP and right after you type the redistribute command you'll say
"hey
> > what happened to my router?". Then a couple minutes later you'll be
saying
> > "hey what happened to my job?" 8)
> >
> > But if you're working in a lab environment I say redistribute away!
> >
> >
> > Brian Dennis, CCIE #2210 (R&S)(ISP/Dial) CCSI #98640
> > 5G Networks, Inc.
> > brian@5g.net
> > (925) 260-2724
> >
> > > -----Original Message-----
> > > From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
> > > Ken Yeo
> > > Sent: Thursday, May 03, 2001 11:19 AM
> > > To: mcaplan.cs@clearstream.com; ccielab@groupstudy.com
> > > Subject: Re: BGP and no-sync
> > >
> > >
> > > Hi Mark,
> > >
> > > Or use:
> > >
> > > router ospf 1
> > > redistribute bgp subnet
> > >
> > > ----- Original Message -----
> > > From: <mcaplan.cs@clearstream.com>
> > > To: <ccielab@groupstudy.com>
> > > Sent: Thursday, May 03, 2001 12:38 PM
> > > Subject: BGP and no-sync
> > >
> > >
> > > > Hi,
> > > >
> > > > I have a question regarding the effects of no-sync on BGP.
> > > >
> > > > The rule for synch, as far as I know is that an IBGP peer will not
> > > advertise
> > > > a BGP route to another peer (IBGP or EBGP) if that route does
> > > not exist in
> > > > the IGP.
> > > >
> > > > From my observations, a corollary to that is that a BGP peer will
not
> > > > install learnt BGP routes into the routing table if sync is turned
on
> > > > (assuming no redistribution). This is shown by comparing 'sh ip
> > > bgp' with
> > > > 'sh ip route'; if sync is on, then routes will be visible in the BGP
> > > routing
> > > > table, but will not be in the IP routing table. To get these BGP
> routes
> > > into
> > > > the IP routing table, one has to simply do a 'no sync'.
> > > >
> > > > I'm just thinking aloud here, but I would appreciate some
> > > confirmation of
> > > my
> > > > logic.
> > > >
> > > > Thanks
> > > >
> > > > Mark
> > > >
> > > >
> > > > Visit us at http://www.clearstream.com
> > > > Check out current job vacancies at
> > > http://www.clearstream.com/public/english/e_vacs.htm
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