[c-nsp] BFD in XR 3.9.1

[Richard A Steenbergen]

On Wed, Aug 25, 2010 at 09:08:42AM +1200, Pshem Kowalczyk wrote:
> that surprising).  We have encountered one limitation - currently BFD
> over ethtrunks is not supported (at least on 9k). We tested it with
> 20ms intervals (even though 15ms is the minimal value Cisco advised us
> to use 20ms).

BFD is an IP based protocol, it's completely ignorant of L2 multipath 
and will almost always get hashed over a single link arbitrarily. This 
means that most failures will not be detected at all, and even if the 
packets do happen to get hashed on the physical member which goes down, 
it will bring down the entire port-channel.

-- 
Richard A Steenbergen <ras at e-gerbil.net>       http://www.e-gerbil.net/ras
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