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- Editor's Note: Minutes received 7/22
-
- CURRENT_MEETING_REPORT_
-
-
- Reported by Fred Baker/ACC
-
- Minutes of the Bridge MIB Working Group (BRIDGE)
-
- The Group met for three purposes:
-
-
- 1. To discuss IEEE 802.5's changes to their MIB, and its impacts on
- the MIB described in RFC 1286.
-
- 2. To discuss implementation experience with RFC 1286.
-
- 3. To determine whether RFC 1286 is ready to advance to Draft Standard
- status.
-
-
- Anil Rijsinghani proposed to facilitate convergence with the Source
- Routing Addendum to 802.1 by including an optional group for SRT
- bridges, called the Source Route Bridge Port Pair Group. It contains
- the following objects:
-
-
- dot1dSrPortPairTableSize
- INTEGER
- "The total number of entries in the Bridge Port Pair Database."
-
-
- This number is n(n+1)/2, given that source routing is occurring over n
- bridge ports.
-
-
- dot1dSrPortPairTable
- dot1dSrPortPairEntry [dot1dSrPortPairLowPort, dot1dSrPortPairHighPort]
-
- dot1dSrPortPairLowPort - an Source Route Port Number
- dot1dSrPortPairHighPort - an SOURCE ROUTE Port Number
- dot1dSrPortPairBridgeNum - the bridge number used in the Source
- Route Descriptor tuple
- dot1dSrPortPairState - "enabled", "disabled", or "invalid"
-
-
- Richard Sweat, IEEE 802.5's designated liaison to the Bridge MIB Working
- Group, then presented their view of RFC 1286. To converge with our
- work, IEEE 802.5 has deleted or modified a number of its managed objects
- and attributes. They also have some specific requests for changes in
- the Source Routing Group of RFC 1286.
-
- IEEE 802.5, having already made these changes in its own MIB, suggests
- that we:
-
- 1
-
-
-
-
-
- o Adopt Anil's Port Pair Group.
-
- o Divide dot1dSrPortHopCountExceededDiscards and dot1dSrPortHopCount,
- which relate to the maximum number of routing descriptors in an All
- Paths Explorer (APE) or Spanning Tree Explorer (STE) frame, into
- two maxima and two counters: one each for APEs and STEs.
-
- o Extend dot1dSrPortLargestFrame (which is an enumerated integer with
- 8 values) to have 64 possible values as described in draft 7 of the
- Source Route Addendum.
-
- o Count occurrences of duplicate LAN IDs or Tree errors, in an effort
- to detect problems in networks containing older IBM Source Routing
- Bridges.
-
- o Count LAN ID Mismatches (cases where a frame is being forwarded,
- but the ``from'' LAN ID is incorrect.
-
- o Instead of counting frames in and frames out, count frames through
- a device. This applies to dot1dSrPortSpecInFrames,
- dot1dSrPortSpecOutFrames, dot1dSrPortApeInFrames,
- dot1dSrPortApeOutFrames, dot1dSrPortSteInFrames, and
- dot1dSrPortSteOutFrames.
-
- o To the dot1dSrGroup, add a scalar read-write variable enumerated
- the same way as dot1dSrPortLargestFrame to indicate the largest
- frame that may pass through the bridge.
-
- o Add a read-write LF Mode field indicating whether the bridge
- operates using older 3 bit length negotiation fields or the newer 6
- bit length field in its RIF.
-
- o Either change the names of objects or include text explaining the
- use of the path type acronyms, as IEEE 802.5 has changed their
- names. The mapping is:
-
- - Spanning Tree Explorer (STE) becomes a Spanning Tree Explorer
- (STE).
- - All Paths Explorer (APE) becomes an All Routes Explorer (ARE).
- - Specifically Routed Frame (Spec) becomes a Source Routed Frame
- (SRF).
-
-
- Fred Baker applauds the efforts of IEEE 802.5 to achieve convergence.
- The Working Group felt that the proposals made by Anil and Richard were
- basically workable, and drew the following conclusions. We also felt
- (although there were three source routing implementations represented)
- that our best expertise was not present at the meeting, and so feel that
- the subject should be discussed on the mailing list before reaching a
- final conclusion.
-
-
- 2
-
-
-
-
-
- The Group's initial conclusions were:
-
-
- o Adopt Anil's Port Pair Group.
-
- o The Group is not sure of the necessity of dividing the hop counts
- and hop count discards by APEs and STEs.
-
- o Extend dot1dSrPortLargestFrame (which is an enumerated integer with
- 8 values) to have 64 possible values as described in draft 7 of the
- Source Routing Addendum.
-
- o Count occurrences of duplicate LAN IDs or Tree errors, in an effort
- to detect problems in networks containing older IBM Source Routing
- Bridges.
-
- o Count LAN ID Mismatches (cases where a frame is being forwarded,
- but the ``from'' LAN ID is incorrect.
-
- o Do not change the way we count frames, as our implementations do in
- fact count them (IEEE was concerned that these could not be
- counted), and this method is consistent with other IETF MIBs.
-
- o To the dot1dSrGroup, add a scalar read-write variable enumerated
- the same way as dot1dSrPortLargestFrame to indicate the largest
- frame that may pass through the bridge.
-
- o Add a read-write LF Mode field indicating whether the bridge
- operates using older 3 bit length negotiation fields or the newer 6
- bit length field in its RIF.
-
- o Include text explaining the use of the path type acronyms.
-
-
- The Group then moved on to discuss implementation experience. Six
- vendors indicated that they had implemented the MIB, and were largely
- happy with it. The following suggestions for clarification were made:
-
-
- o Anil will provide clarifying text for the DESCRIPTION of
- dot1dStpPortPathCost, which some have found inadequate.
-
- o The Default Value of dot1dStaticAllowedToGoTo be specified in the
- DESCRIPTION as a string of ones of appropriate length.
-
- o The Default Value of dot1dStaticStatus is ``permanent''.
-
- o Port Numbers use the range 1..65535.
-
- o Update the bibliography.
-
-
- 3
-
-
-
-
-
- o dot1dTpPortInFrames and dot1dTpPortOutFrames be clarified by
- changing the last few words in the description from ``processed by
- the local bridging function'' to ``processed by the bridging
- function, including management frames.''
-
-
- We will ask the list to ratify these clarifications.
-
- One other issue was raised which affects the strategic direction of this
- Working Group. Some vendors are interested in proxying for IBM Source
- Routing Bridges, which use a modified version of the 802.1(d) BPDU.
- Also, IEEE 802.1(g) currently proposes that the BPDU be modified in
- remote bridges when sent on the lines. It is quite possible, then, that
- a bridge might participate in more than one spanning tree on a port by
- port basis.
-
- Fred Baker proposed that the object dot1dStpProtocolSpecification, which
- indicates a single spanning tree protocol in use in the system, be
- deprecated and replaced with an INTEGER bit string indicating the
- spanning tree protocols that the device is capable of:
-
-
- 1 other
- 2 decLb100
- 4 ieee8021d
- 8 ibmTolkienRing
- 16 ieee8021g
-
-
- In addition, an object is added to the dot1dStePortEntry indicating
- which of those protocols is running on the indicated port. This allows
- for some flexibility.
-
- The proposal of the Working Group, given ratification of the above
- changes on the list, is that:
-
-
- o The Group do nothing now with IEEE 801.2(g)'s proposals, as it is
- not sufficiently close to completion.
-
- o The Group separate the Source Routing Group into a separate
- document, apply the ratified subset of Anil's and Richard's
- proposals, and recommend that this remain at Proposed Standard
- status.
-
- o The Group apply the requested clarifications and, if ratified,
- Fred's proposed object change, and advance the bulk of the Bridge
- MIB to Draft Standard Status.
-
-
- Attendees
-
-
-
- 4
- ^L
-
-
-
-
- David Arneson arneson@ctron.com
- Sam Ayers s.ayers@sybus.com
- Fred Baker fbaker@acc.com
- Andy Bierman bierman@davidsys.com
- Greg Celmainis gregc@newbridge.com
- Chris Chiotasso chris@artel.com
- Cathy Cunningham cmc@microcom.com
- David Engel david@ods.com
- Pria Graves priag@nsd.3com.com
- George Kajos kajos@coral.com
- Mark Kepke mak@cnd.hp.com
- Steven Lynes lyness@rimail.interlan.com
- Cindy Mazza
- Keith McCloghrie kzm@hls.com
- David Minnich dwm@fibercom.com
- Rina Nathaniel rina!rnd!rndi@uunet.uu.net
- John Payne jop@wang.com
- Venkat Prasad vsp@3com.com
- Guenter Roeck roeck@conware.de
- Michael Sapich sapich@conware.de
- Koichiro Seto seto@hitachi-cable.co.jp
- Timon Sloane peernet!timon@uunet.uu.net
- Chris Sullivan mm@gandalf.ca
- Richard Sweatt rsweatt@synoptics.com
- Stephen Tsun snt@nsd.3com.com
- Luanne Waul luanne@wwtc.timeplex.com
- Gerard White
- Kiho Yum kxy@nsd.3com.com
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- 5
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