[IPFIX] ipNextHopIPv6Address reported address

Nick Brown <brownn@Brocade.com> Thu, 04 June 2015 11:07 UTC

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From: Nick Brown <brownn@Brocade.com>
To: "ipfix@ietf.org" <ipfix@ietf.org>
Thread-Topic: ipNextHopIPv6Address reported address
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Date: Thu, 4 Jun 2015 11:07:19 +0000
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Cc: Luca Boccassi <lboccass@Brocade.com>, Derek Fawcus <dfawcus@Brocade.com>, Paul Atkins <patkins@Brocade.com>, Doug Gordon <dgordon@Brocade.com>
Subject: [IPFIX] ipNextHopIPv6Address reported address
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Hi All,

In a sentence, is it expected that ipNextHopIPv6Address should report
the global ipv6 address of the next hop when it has one, or may the link
local address be reported instead?
http://tools.ietf.org/html/rfc5102#section-5.7.3

There are obvious cases where the next hop may only have link local
address, if example it's only configured that way. But in other cases
where it may have both a link local and global address it's often the
case that routing protocols may use local addresses to setup the
forwarding plane where traffic is being observed. Thus at the point in
the forwarding path that traffic is being observed this all that is
available, and it's not apparent that a mapping from link local address
to global address (where is exists) can be done.

Cheers,
Nick