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List:       ipng
Subject:    (IPng 4257) Comment: IPv6 over FDDI - user_priority
From:       Robin Tasker <R.Tasker () dl ! ac ! uk>
Date:       1997-08-05 9:06:53
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Matt

Just reading IPv6 over FDDI ID (draft-ietf-ipngwg-trans-fddi-net-02.txt),
the discussion in Section 4 (Interaction with Bridges) talks about FDDI
adjacency detection. This is achieved by sending a non-zero LLC priority
which is, in IEEE 802 language, the user_priority parameter of the
M.UNITDATA.request primitive set to non-zero. This relates to Neighbor 
Solicitation, Neighbor Advertisement and Router Advertisement frames.

IEEE 802.1 is near to completing 802.1p which defines mechanisms to provide
traffic classes in bridges/switches and therefore prioritised traffic flows
in bridged networks. The use of the user_priority parameter is central to
this work.

The proposal in the above ID does not impinge on this work; these frames are
"managing the network" and so need a good priority. However it makes sense
to define the level of user priority to be used rather than leaving it
unspecified as non-zero. The use of user_priority = 7 (the best you can have)
would seem to be a good value.

Thanks!

Robin


Robin Tasker
CLRC, Daresbury Laboratory			tel:	+44 1925 603226
Warrington					fax:	+44 1925 603230
Cheshire WA4 4AD				email:	r.tasker@dl.ac.uk
UK

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