North American Network Operators Group
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Re: The Cidr Report

  • From: Joe Abley
  • Date: Fri Nov 14 14:54:29 2003 
On 14 Nov 2003, at 14:41, McBurnett, Jim wrote:
just how bad is the auto-summarization at the upstream for the route propagation
via BGP in the large routers anyway?
What auto-summarisation?

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.


Joe