Re: [Isis-wg] I-D Action:draft-ietf-isis-layer2-11.txt

[Xu Xiaohu <[e-mail]>]

Hi all,

As I heard from some could data center operators, 4096 VLANs would not be
enough for isolating the huge amount of tenants in their future data center
networks. Besides, the VLAN translation is a desirable feature in some
scenarios (e.g., the same VLAN ID in different parts of the data center
network is used for different tenants while different VLAN IDs in different
parts of the data center network are used to connect a single tenant).

Hence, I wonder whether it is possible to replace the fixed-length VLAN ID
field (e.g., the VLAN-ID field in the MAC-reachability TLV as shown below)
with a tenant/VPN instance ID TLV. With such TLV, at least the two problems
mentioned above can be solved easily. 

Best wishes,
Xiaohu

========================================================================
2.1.  The MAC-Reachability TLV

   The MAC-Reachability (MAC-RI) TLV is IS-IS TLV type 141 and has the
   following format:

   +-+-+-+-+-+-+-+-+
   | Type= MAC-RI  |                  (1 byte)
   +-+-+-+-+-+-+-+-+
   |   Length      |                  (1 byte)
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |   Topology-Id/ Nickname       |  (2 bytes)
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |   Confidence  |                  (1 byte)
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |  RESV |      VLAN-ID          |  (2 bytes)
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |                          MAC (1)    (6 bytes)                 |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |                   .................                           |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |                          MAC (N)    (6 bytes)                 |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+



> -----邮件原件-----
> 发件人: [e-mail] [mailto:[e-mail]] 代表
> [e-mail]
> 发送时间: 2011年2月10日 4:00
> 收件人: [e-mail]
> 抄送: [e-mail]
> 主题: [Isis-wg] I-D Action:draft-ietf-isis-layer2-11.txt
> 
> A New Internet-Draft is available from the on-line Internet-Drafts
> directories.
> This draft is a work item of the IS-IS for IP Internets Working Group of
the
> IETF.
> 
> 
> 	Title           : Extensions to IS-IS for Layer-2 Systems
> 	Author(s)       : A. Banerjee, D. Ward
> 	Filename        : draft-ietf-isis-layer2-11.txt
> 	Pages           : 11
> 	Date            : 2011-02-09
> 
> This document specifies the Intermediate System to Intermediate
> System (IS-IS) extensions necessary to support link state routing for
> any protocols running directly over Layer-2.  While supporting this
> concept involves several pieces, this document only describes
> extensions to IS-IS.  Furthermore, the Type, Length, Value pairs
> (TLVs) described in this document are generic Layer-2 additions and
> specific ones as needed are defined in the IS-IS technology specific
> extensions.  We leave it to the systems using these IS-IS extensions
> to explain how the information carried in IS-IS is used.
> 
> A URL for this Internet-Draft is:
> http://www.ietf.org/internet-drafts/draft-ietf-isis-layer2-11.txt
> 
> Internet-Drafts are also available by anonymous FTP at:
> ftp://ftp.ietf.org/internet-drafts/
> 
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