[c-nsp] BFD on port channel

[Geert Nijs]

As far as i know, BFD is not supported on portchannels. Some IOS however,
let you configure it, but it doesn't work. And it is quiet logical:
think about it: by default BFD is running on one link in your portchannel.
What if this link fails ? do you want to bring down OSPF/BGP ? no of course
not,
however, bfd would react so fast it would bring down the routing session
even before it is able to fail over to another link.

The same for the other suggestion: run BFD on each link (resource waiste
and hog). Run BFD on each link, but only bring down the routing session
when the last BFD
on the portchannel goes down ? ok would work, but how would you send
traffic on each link: BFD works on IP level, not L2 or even L1 level,  you
can't put an IP on each link in a portchannel,

so no, forget BFD and portchannels :-)

regards,
Geert

2011/10/25 zaid <zaidoon_h at yahoo.com>

> my ios 12.2 SRB doesn't support BFD on port channel , I look for BFD per
> link ? which ios dose support ? is there another way to detect port channel
> failure
>
>
>  Zaid
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