From: Paul Borghese (pborghese@xxxxxxxxxxxxxx)
Date: Thu Feb 24 2000 - 18:53:41 GMT-3
Pretty simple BGP questionRemember to use the keyword summary-only with the
aggregate statement. Or else the more specific routes will also be sent,
along with the aggregate.
Also, you can use the network statement to aggregate routers as long as that
aggregated route is in your routing table. This is usually accomplished by
writing a static route with the aggregated mask to null0. The static route
will not have an effect on the more specific routes because of the longest
match rule.
Paul Borghese
----- Original Message -----
From: Price, Jamie
To: 'ccielab@groupstudy.com'
Sent: Thursday, February 24, 2000 9:42 AM
Subject: Pretty simple BGP question
Hi,
I'm just looking for some clarification on my interpretation of the
difference between BGP summarization and aggregation.
The way I see it summarization is used to summarize the advertisement of
routes from one router in an AS. Two prerequisites must be met - the
summarized network needs to be advertised under the BGP process and
summarized prefix must exist in the routers IP routing table so that the
prefix of that summarization is installed into the BGP routing table. ie the
router advertising routes out of the AS can summarize those routes if the
prerequisites are met (and of course if summarization is possible for that
range of prefixes).
Aggregation on the other hand is used to aggregate routes that already
appear in the BGP routing table ie a router that recieves routes from other
AS's can then aggregate those routes for advertisement into its own AS and
beyond.
Am I right with this???
Thanks in advance
Jamie
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