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List:       cisco-nsp
Subject:    Re: [c-nsp] BFD in XR 3.9.1
From:       Vikas Sharma <vikassharmas () gmail ! com>
Date:       2010-08-27 2:59:08
Message-ID: AANLkTikQWr8MgncW49o_=a_J1btaz9DZPniJVeaO06+A () mail ! gmail ! com
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Hi,

Not sure why you are using "L2 multipath" with BFD... as far as I know
"L2 multipath" is sth related to DC and replacement of STP (i may be
wrong)

Regards,
Vikas

On Wed, Aug 25, 2010 at 11:32 AM, Richard A Steenbergen
<ras@e-gerbil.net> wrote:
> 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@e-gerbil.net>       http://www.e-gerbil.net/ras
> GPG Key ID: 0xF8B12CBC (7535 7F59 8204 ED1F CC1C 53AF 4C41 5ECA F8B1 2CBC)
>

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