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Re: [Pals] Alia Atlas' Yes on draft-ietf-pals-vccv-for-gal-05: (with COMMENT)

Stewart Bryant <stbryant@cisco.com> Thu, 17 September 2015 15:47 UTC

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To: Alia Atlas <akatlas@gmail.com>
From: Stewart Bryant <stbryant@cisco.com>
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Date: Thu, 17 Sep 2015 16:47:52 +0100
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Cc: Matt Bocci <matthew.bocci@alcatel-lucent.com>, draft-ietf-pals-vccv-for-gal@ietf.org, draft-ietf-pals-vccv-for-gal.ad@ietf.org, draft-ietf-pals-vccv-for-gal.shepherd@ietf.org, pals-chairs@ietf.org, The IESG <iesg@ietf.org>, pals@ietf.org
Subject: Re: [Pals] Alia Atlas' Yes on draft-ietf-pals-vccv-for-gal-05: (with COMMENT)
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Hi Alia

How about:

Where the LSP used by the PW is subject to Equal-Cost Multi-path (ECMP)
load balancing, a problem arises if any LSR on that LSP treats special
purpose labels as ordinary labels in its
ECMP selection method. In these circumstances the inclusion of a GAL
following the PW LSE can cause the OAM packet to take a different path
through the network from the corresponding PW data packets. If the
LSP traverses such equipment and this behaviour is not acceptable,
then an alternative VCCV type needs to be used. The method of excluding
special purpose labels from the ECMP next hop decision is described in
[RFC7325].

- Stewart

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