From: Howard C. Berkowitz (hcb@gettcomm.com)
Date: Sat Jul 10 2004 - 18:40:04 GMT-3
At 2:30 PM -0700 7/10/04, Joe Deleonardo wrote:
>http://www.cisco.com/univercd/cc/td/doc/product/software/ios120/120newft/120
>limit/120st/120st11/bgpbporf.htm
>
>Does anyone understand what's really going on here. At first glance it seems
>like a filter would do the same job.
>
>When I read into it, it almost seems like a peer that wants to accept
>limited routes from an eBGP peer sends a message that says "only send me
>these prefixes." Otherwise, if that's not the case, I don't see the benefit
>of doing this. You might as well use a regular filter.
>
>Can anyone confirm my suspicions about what's going on with this feature?
Sure. ORF causes your peer router to block routes it would otherwise
transmit and you would reject. At the first level, this saves
bandwidth that would be otherwise consumed by your inbound filter.
When ORF is implemented widely, it lowers the overall filtering load
on all routers, since only desired traffic will be received.
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