[c-nsp] BFD on port channel

[Ruslan Pustovoytov]

We use BFD between ASR9k and ALU 7750SR.
ASR configured to do one session for bundle because ALU cannot do BFD 
session per link.
So, ASR selects one port from bundle and sends BFD packet over it.
ALU does BFD on RP, one session for etherchannel, but it sends BFD 
packets into each link consecutively, first link, second link and so on 
to monitor a whole bundle.
In such a way to prevent ASR from timing out bfd session due to small 
number of packet hit  for bfd agent we set multiplayer on ASR side to 
relatively big value.
Bundle resides on different card in both routers.
And it works.




> Geert,
>
>   
>> so no, forget BFD and portchannels :-)
>>
>>     
>
> not so quickly :-) On NX-OS as well as IOS-XR, two platforms/OS where we
> have been running BFD sessions on the linecards, we do support BFD on
> channels/bundle, albeit in a proprietary fashion as this is not (yet?)
> standardized. As we're still using Layer 3 BFD pkts, now running over
> each bundle/channel member, the topologies supported by the specific BFD
> over channel implementations are limited, on IOS-XR we can only do
> back-to-back bundles (i.e. between two XR devices), NX-OS is a bit more
> flexible in this regard. 
>
> So BFD  and portchannels is still tricky and limited to some platforms
> and topologies, but it's certainly not impossible. 
>
> 	oli
>
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