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List:       ipng
Subject:    (IPng 4258) Re:  Comment: IPv6 over FDDI - user_priority
From:       Paul Ferguson <pferguso () cisco ! com>
Date:       1997-08-05 10:04:10
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As an aside, it might be worthwhile to also note that some
complimentary work has been drafted in the same vein, albeit
with regards to IPv4 and Integrated Services:

 Integrated Services over IEEE 802.1D/802.1p Networks
 draft-ietf-issll-802-01.txt

This draft provides a proposal to map user_priority
values carried in 802.1p to one of the integrated service
classes:

[snip]

Proposal:  A Simple Scheme

     user_priority      Service
       0                "less than" Best Effort
       1                Best Effort
       2                reserved
       3                reserved
       4                Controlled Load
       5                Guaranteed Service, 100ms bound
       6                Guaranteed Service, 10ms bound
       7                reserved

[snip]

FYI,

- paul

At 10:06 AM 08/05/97 +0100, Robin Tasker wrote:

>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.
>

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