The MPLS WG Archive

[Xiaohu Xu <xuxh@huawei.com>]

Hi, Adrian,

Thanks for your comments firstly.

   In contrast with the procedure of establishing a bidirectional TE tunnel defined in 
   GMPLS draft [RFC 3473], there is no additional requirement on 
   middle-hop LSRs here. The middle-hop LSRs only need to transit the 
   unknown binding object. In addition, the modification of RSVP-TE is 
   small relatively and the path of two opposite tunnel can be different, 
   and there is no need for Path message to assign label.

Bidirectional TE tunnel can support many purposes as follows:
1, be used as tunnel for VR-based VPN;
2, achieve LDP over TE easily;
3, interconnect two seperated routing domains via bidiretional TE tunnel, it is more flexible than IGP shortcut and adjacency as different routing protocols can be run in MPLS core domain and the seperated routing domains;
4, BFD can be deployed between the bidirectional TE interfaces to achieve fast switchover of hot standby LSP in case that the primary LSP is down.   

Best regards,

Xiaohu Xu
Email: xuxh@huawei.com

----- Original Message ----- 
From: "Adrian Farrel" <adrian@olddog.co.uk>
To: <zhangle@huawei.com>; <xuxh@huawei.com>
Sent: Wednesday, March 08, 2006 7:11 AM
Subject: Fw: I-D ACTION:draft-xu-mpls-rsvp-te-bidirection-00.txt


> Hi,
> 
> Interesting draft, but can you tell me what is wrong with using the
> existing extensions to RSVP-TE for bidirectional LSPs? See RFC3473.
> 
> On the other hand, if you must associate to unidirectional LSPs with each
> other, can you tell me what is wrong with using the existing Association
> object? It was invented specifically to allow multiple LSPs to be
> associated with each other.
> 
> Thanks,
> Adrian
> ----- Original Message ----- 
> From: <Internet-Drafts@ietf.org>
> To: <i-d-announce@ietf.org>
> Sent: Tuesday, March 07, 2006 8:50 PM
> Subject: I-D ACTION:draft-xu-mpls-rsvp-te-bidirection-00.txt
> 
> 
> > A New Internet-Draft is available from the on-line Internet-Drafts
> directories.
> >
> >
> > Title : Bidirectional RSVP-TE Tunnel
> > Author(s) : X. Xu, L. Zhang
> > Filename : draft-xu-mpls-rsvp-te-bidirection-00.txt
> > Pages : 8
> > Date : 2006-3-7
> >
> > Through the binding of two unidirectional RSVP-TE tunnels established
> > between a pair of LSRs destined to each other, a bidirectional RSVP-
> > TE tunnel is formed. The bidirectional RSVP-TE tunnel can be used to
> > establish L3VPN with virtual router technology.
> >
> >
> >
> > A URL for this Internet-Draft is:
> >
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