From: Dan Shechter (danshtr@yahoo.com)
Date: Sun Jul 11 2004 - 05:52:29 GMT-3
Hello,
What IOS version is needed for this?
Thanks,Dan
Howard C. Berkowitz wrote:
> 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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