From: Howard C. Berkowitz (hcb@gettcomm.com)
Date: Sun Jul 11 2004 - 13:32:57 GMT-3
At 11:52 AM +0300 7/11/04, Dan Shechter wrote:
>Hello,
>
>What IOS version is needed for this?
>
>Thanks,Dan
I can't say that it may not have been available in some other major
release, but I seem to recall it being around 12.2T (I think 4).
You'd have to check the release notes.
>
>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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