From: McDonald, Ira (imcdonald@sharplabs.com)
Date: Wed Aug 15 2007 - 16:01:56 EDT
Hi,
[I've already discussed this rationale with Rick]
Our most recent CIM printing class is the Association
CIM_AssociatedPrintChannelEndpoint, which is a rather
heavyweight mapping of the 'prtChannelIfIndex' pointer
to the 'ifTable' in MIB-II.
Why abandon this class?
(1) It overlaps with the pre-existing CIM_PrintSAP class!
(2) For modern multi-home network printers (with Ethernet,
and various wireless interfaces), 'ifIndex' is ambiguous
and in fact unknown to the application print protocols
(there is no way to probe below the IP layer-3 socket
to determine which datalink layer-2 interface is used).
(3) For older network printers, the mapping is trivial
(serial, parallel, or network) and uninteresting.
(4) While the CIM class CIM_ProtocolEndpoint does contain
MappingStrings for five 'ifTable' properties, it isn't
reasonable to burden a CIM/SNMP Proxy with this support
(and in case (2) above, is ambiguous anyway).
Therefore, I propose that we abandon 'prtChannelIfIndex'
object mapping for our CIM Print Device modelling.
Cheers,
- Ira
Ira McDonald (Musician / Software Architect)
Chair - Linux Foundation Open Printing WG
Blue Roof Music / High North Inc
PO Box 221 Grand Marais, MI 49839
phone: +1-906-494-2434
email: imcdonald@sharplabs.com
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