Subject: Re: [mpls] New Version Notification for draft-xu-l2vpn-vpls-isis-01.txt

From: Xuxiaohu <[email-masked]>
Date: Tue, 06 Sep 2011 09:58:56 +0000

Hi all,

I just realized that the locally unique VPLS label which is advertised in the to-be-defined IS-IS TLV could actually be used for both unicast and multicast. In other words, the same VPLS label could be treated as a downstream-assigned label for unicast and a upstream-assigned label for multicast. For example, assume PE-1 advertises a locally unique label L for VPLS instance X with that to-be-defined IS-IS TLV, other PE routers could send known unicast packet destined for PE-1 with label L contained as a downstream-assigned label. Meanwhile, PE-1 could send a multicast packet for VPLS X containing label L as an upstream-assigned label. The egress PE routers could distinguish whether the MPLS label contained in the encapsulated VPLS packet is an upstream-assigned label or a downstream-assigned label according to the "MPLS label type" information contained in the encapsulated VPLS packets, taken the MPLS-in-GRE encapsulation as an example, the protocol type field in the GRE header would be set to 0x8847 for MPLS unicast and 0x8848 for multicast. 

Any comments?

Best regards,
Xiaohu

> -----邮件原件-----
> 发件人: [email-masked] [mailto:[email-masked]] 代表
> Xuxiaohu
> 发送时间: 2011年9月6日 16:24
> 收件人: [email-masked]
> 主题: fwd: New Version Notification for draft-xu-l2vpn-vpls-isis-01.txt
> 
> Hi all,
> 
> The new version of IS-IS VPLS is now available at
> http://tools.ietf.org/html/draft-xu-l2vpn-vpls-isis-01. IS-IS VPLS is a light-weight
> VPLS which is intended to be used as a scalable cloud data center network
> solution.
> 
> Any comments are welcome.
> 
> Best regards,
> Xiaohu
> 
> > -----邮件原件-----
> > 发件人: [email-masked] [mailto:[email-masked]]
> > 发送时间: 2011年9月6日 15:58
> > 收件人: Xuxiaohu
> > 抄送: [email-masked]; Xuxiaohu
> > 主题: New Version Notification for draft-xu-l2vpn-vpls-isis-01.txt
> >
> > A new version of I-D, draft-xu-l2vpn-vpls-isis-01.txt has been successfully
> > submitted by Xiaohu Xu and posted to the IETF repository.
> >
> > Filename:	 draft-xu-l2vpn-vpls-isis
> > Revision:	 01
> > Title:		 Virtual Private LAN Service (VPLS) Using IS-IS
> > Creation date:	 2011-09-06
> > WG ID:		 Individual Submission
> > Number of pages: 9
> >
> > Abstract:
> >    This document describes a light-weight Virtual Private LAN Service
> >    (VPLS) which uses IS-IS for auto-discovery and signaling.
> >
> >
> >
> >
> >
> > The IETF Secretariat