802.1H Revision Project

1
802.1H Revision Project

• Kevin Nolish
• Michael Wright

2
802.1H - Background

• 802.1H is a recommended practice that concerns
  bridging interconnected LANs where a mixture of
  802.3 and Ethernet v2.0 traffic is present. It
  also addresses bridging between LANs with
  different underlying data links.
• Originally Ethernet and Token Ring or FDDI
• Today the biggest usage seems to be in 802.11

3
802.1H PAR Highlights

• Need for the project
• 802.1H is in need of updating to reflect
  developments in bridging since publication in
  1997 and to correct inaccuracies in the text
  resulting from changes in other standards.
• PAR Approval Date 15 Sep 2006
• PAR Expiration Date 31 Dec 2010
• Original Submission Dates
• Enter Sponser Ballot 7 2008
• RevCom Submittal 7 2009

4
Editors Plans

• Update the Service Model
• Remove Older Technologies
• 802.5
• FDDI ?
• Add new technologies
• 802.11 makes use of RFC1042 and 802.1H as
  configuration options.
• Clause 6.1.4 of 802.11 2007 MSDU format
• Annex M Integration function
• Recommends the use of 802.1h
• Add MIB items
• Add protocol definition table

5
PB and PBB bridging

• What are the implications for technologies that
  stack tags?
• Should 802.1H address such technologies?
• Do we have to convert just the outermost tag, or
  do we have to deal with the entire tag stack?
• Presumably VLAN tags behind an I-TAG dont
  matter.
• Does 802.1H apply to S, B, or I components?

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Project Schedule

• Limit the scope of the project to updating the
  document to those 802 technologies that use
  802.1h
• Is this satisfactory with 802.1?
• We will need input from 802.11 and any other dot
  group that uses 802.1h

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Next Steps

• Editors active solicit feedback and welcome any
  input
• Editors will produce a draft for task group
  ballot
• Need active participation of someone from 802.11
  since their standard does make use of 802.1h

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Backup Slides
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802.11 Issues

• 802.11 Classifier Type 2 has a VLAN ID
• Does this require a similar kind of conversion
  going between an 802.3 and 802.11 interface?
• Annex M.3 of 802.11 calls out bridging of VLAN
  tagged MSDUs between 802.3 and 802.11 LANs.
• Investigate This
• Is the WLAN integration service a replacement for
  bridging? If so 802.1H may not apply.

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SNAP Encoded VLAN Tags

• Apparently on some LANs other than 802.3, the
  VLAN tag must be carried by a SNAP encoding.
• DSAP-AA SSAP-AA CTL-3
• Protocol ID 00-00-00-81-00
• Followed by VLAN TAG
• What are these technologies? Are they still
  relevant? Do we have to do this LLC encoding?
  Are LLC encoded VLAN tags acceptable on 802.3,
  thus buying into the rfc 1042 problem, or can we
  ALWAYS cut out the LLC/SNAP portion of the tag
  when going to 802.3 from something else?

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802.15

• The major 802.15 standard, 802.15.1 doesnt
  mention VLANs.
• There are other standards regarding interworking
  with wireless networks, but I think that 802.15
  will not be a problem child.
• Upon reflection, VLANs in a Personal Area Network
  are a little odd.

12
802.16

• 802.16 needs to be investigated. Section 5.2.5
  refers to 802.1Q tagged frames.
• This is probably OK as this seems to be referring
  to carrying 802.1Q tagged frames as opposed to
  802.16 having a VLAN concept of its own requiring
  an LLC/SNAP encoded Vlan TAG.

13
Diagram Issues

• What, exactly, are the semantics of the ISO/IEC
  service model diagrams?
• Does the circle represent a lan or an
  interconnection?
• Would these be better off if replaced with a
  baggy pants style diagram?
• The editors realize that, generally, illustrating
  frames is considered a bad idea in 802.1, but it
  seems to be central to 802.1H.