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Re: Re: draft-suping-bfd-mpls-fecmismatch-00 questions

zhaisuping <zhaisuping@huawei.com> Sat, 26 February 2005 01:40 UTC

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Date: Sat, 26 Feb 2005 09:41:49 +0800
From: zhaisuping <zhaisuping@huawei.com>
To: George Swallow <swallow@cisco.com>, "rtg-bfd@ietf.org" <rtg-bfd@ietf.org>
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Subject: Re: Re: draft-suping-bfd-mpls-fecmismatch-00 questions
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Hi, all
The purpose of FEC filter in BFD is to detect the consistence of 
the control plane and data plane. So that in the MPLS network, just
running the BFD session(LSP-Ping is not needed) is enough for the
defect detection. Or else such tools as LSP-Ping is needed because
the BFD session can't detect the inconsistence of the control plane
and data plane. 
In the section 2 of the draft, there is description of the 
problem the draft want to solve.
>> Wouldn't LSP-Ping (or VCCV) be a more appropriate place to do this
>> filter verification?


>
>LSP-Ping does a verification on the FEC itself, so a filter would add
>nothing.
>
>VCCV is not a protocol.  Just a little sideband for sending IP packets
>down a pseudowire so that you can run LSP-Ping, BFD, etc. between the
>two ends.
>
>....George
>
>========================================================================
>George Swallow             Cisco Systems                  (978) 936-1398
>                           1414 Massachusetts Avenue
>                           Boxborough, MA 01719

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