From: John Conzone (jkconzone@xxxxxxxx)
Date: Sat May 27 2000 - 21:53:12 GMT-3
Kevin, U R DA MAN. That worked perfectly! I put in a network statement
for 170.100.2.0 that was in the table, then used the aggregate, summary only
command as you suggested.
Thanks for the help!
----- Original Message -----
From: "Kevin M. Woods" <kev@nil.org>
To: "John Conzone" <jkconzone@home.com>
Cc: "ccielab" <ccielab@groupstudy.com>
Sent: Saturday, May 27, 2000 8:10 PM
Subject: Re: Creating a summary for BGP
> A summary is not needed from IGRP to advertise a summary from BGP. You
can
> do this without a static route with:
>
> router bgp 64512
> network 170.B.C.D [ mask A.B.C.D ]
> aggregate-address 170.0.0.0 255.0.0.0 summary-only
>
> And as long as a portion of 170.0.0.0/8 is in the routing table, is
learned
> via IGP, and has a matching network statement present, this summary will
be
> advertised (a BGP learned route will keep it advertised as well but that
is
> a slightly different situation).
>
> Another option that can be used in some cases is to leave on automatic
> summarization for BGP (i.e. don't use `no auto-summary'). This will cause
all
> redistributed routes to be summarized to their classful boundary. This
may be
> how you want to do your aggregation sometimes.
>
> In real life you will almost always want to use statics to avoid route
flaps
> for the benefit of the Internet.
>
> Kevin
>
> // I'm working through a practice lab I got at ASET and need some
input.
> // I have a router thats running IGRP. I also had to configure BGP on
this router, and advertise a supernet of 170.0.0.0/8 out BGP. The router has
various 170 interfaces, but I couldn't think of a way to summarize them
into a 170.0.0.0/8 without a static. No knob in IGRP like with OSPF that I
could find. The only thing I could come up with was a static to null 0,
which I understand is points off on the real lab.
> // Anyone think of anything?
> // Thanks!
> //
> // John Conzone
> //
> // CNE, CCNA, CCNP, CCNP Voice, CCIEwannabe
>
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