[c-nsp] BFD on 7600

[Jason Plank]

Just an FYI - this is a document that explains overall functionality of BFD....

http://www.cisco.com/en/US/technologies/tk648/tk365/tk480/technologies_white_paper0900aecd80244005.html

On Fri, Aug 21, 2009 at 11:34 AM, Justin Shore<justin at justinshore.com> wrote:
> MKS wrote:
>>
>> Can you share your experience with BFD on the 7600 platform and sw
>> release?
>
> I use it and like it.  However beginning with SRB2 Cisco removed support for
> running BFD on SVIs.  To date there is no workaround and the feature hasn't
> been added back to SR.  Otherwise it works fine in my experience.
>
>> The document hints that BFD runs in hardware on the following
>> modules,but does not explicitly say so. Can someone clarify this for
>> me?
>
> To the best of my knowledge BFD is 100% software driven.  Generating echo
> requests, processing those requests, receiving the echo replies and
> processing them aren't things that ASICs are suited for I don't believe.   I
> could be mistaken and someone else may chime in with more detailed
> knowledge, but I wouldn't expect something like BFD to be handled in
> hardware.
>
> That's not necessarily a reason to not use BFD.  BFD is meant to be
> lightweight.  That may be a reason not to run several thousand instances of
> it on a single router of course...
>
> Justin
>
>
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-- 
--
Jason Plank
(CCIE #16560)