The Cidr Report
jabley at isc.org
Fri Nov 14 19:52:08 UTC 2003
On 14 Nov 2003, at 14:41, McBurnett, Jim wrote:
> just how bad is the auto-summarization at the upstream for the route
> via BGP in the large routers anyway?
If you're talking about the cisco "auto-summary" command, then the
answer is "so bad that it's universally disabled" (but then
"auto-summary" is concerned with aggregation on pre-CIDR, classful
boundaries which I don't think is what you were talking about).
Absent a precise understanding of all the routing policies concerned,
proxy aggregation is dangerous and is hence generally not done.
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