From: Kevin M. Woods (kev@xxxxxxx)
Date: Sat May 27 2000 - 21:10:01 GMT-3
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 p
oints off on the real lab.
// Anyone think of anything?
// Thanks!
//
// John Conzone
//
// CNE, CCNA, CCNP, CCNP Voice, CCIEwannabe
This archive was generated by hypermail 2.1.4 : Thu Jun 13 2002 - 08:23:32 GMT-3