query on draft-ietf-iplpdn-frmib-dte-04.txt
John Shriver <jas@shiva.com> Tue, 09 May 1995 19:41 UTC
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From: John Shriver <jas@shiva.com>
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To: cbrown@wellfleet.com, charles@acc.com, fred@cisco.com
CC: iplpdn@CNRI.Reston.VA.US
Subject: query on draft-ietf-iplpdn-frmib-dte-04.txt
How does one uses this draft MIB (or RFC 1315) to express things like: 1. Novell's model of each Frame Relay DLCI is one IPX network. 2. Cisco's implementation of "subinterfaces" on a Frame Relay interface, allowing multiple IP nets for various aggregations of DLCI's. It looks like the MIB evolved in the old model of "one Frame Relay interface :== one network layer interface :== one SNMP interface". The description of: frCircuitIfIndex OBJECT-TYPE SYNTAX Index MAX-ACCESS read-only STATUS current DESCRIPTION "The ifIndex Value of the ifEntry this virtual circuit is layered onto." ::= { frCircuitEntry 1 } only binds it to the underlying FR interface. It doesn't provide that this entry may be all (or part of) an SNMP interface as seen by the network protocols. In either of these, the most "RFC 1573 way" would seem to be to have one SNMP "interface" for each of these DLCI's or DLCI clusters. (Somewhat like the way PPP runs over RS-232. Yeah, I don't enjoy that either.) Although, RFC 1573 admits: Several of the sub-layers for which media-specific MIB modules have been defined are connection oriented (e.g., Frame Relay, X.25). Experience has shown that each effort to define such a MIB module revisits the question of whether separate conceptual rows in the ifTable are needed for each virtual circuit. Most, if not all, of these efforts to date have decided to have all virtual circuits reference a single conceptual row in the ifTable. On the other hand, RFC 1573 says: 3.2.4. Virtual Circuits This memo strongly recommends that connection-oriented sub-layers do not have a conceptual row in the ifTable for each virtual circuit. This avoids the proliferation of conceptual rows, especially those which have considerable redundant information. (Note, as a comparison, that connection-less sub-layers do not have conceptual rows for each remote address.) There may, however, be circumstances under which it is appropriate for a virtual circuit of a connection- oriented sub-layer to have its own conceptual row in the ifTable; an example of this might be PPP over an X.25 virtual circuit. The MIB in section 6 of this memo supports such circumstances. If a media-specific MIB wishes to assign an entry in the ifTable to each virtual circuit, the MIB designer must present the rationale for this decision in the media-specific MIB's specification. I'm opening a can of worms, aren't I? (Or did Novell open it first?) Even RFC 1490 doesn't really talk about this issue. I did look at back archives of the list first. Nothing there on this issue in 1994-95.
- query on draft-ietf-iplpdn-frmib-dte-04.txt John Shriver
- Re: query on draft-ietf-iplpdn-frmib-dte-04.txt Fred Baker
- Re: query on draft-ietf-iplpdn-frmib-dte-04.txt John Shriver