The MPLS WG Archive

["Neelesh Dwivedi" <neelesh@mercurykr.com>]

Abhay,
Thanks for your reply.

But as the description of the MplsLSPID in  draft-ietf-mpls-tc-mib-02.txt
says:
"This is assigned at the head end of the LSP and can be used by all LSRs
to identify this LSP."
Now if we consider Head-End to be the Ingress LSR, then how is it going to
inform the other LSRs about the LSPID? The point is how are we going to
piggyback this
LSPID on any Signaling Protocol control message  ?

Neelesh.
Mercury Corporation
New Delhi R&D Centre,
Gurgaon, India.

----- Original Message -----
From: abhay
To: Neelesh Dwivedi
Cc: mpls@UU.NET ; cheenu@alphion.com
Sent: Wednesday, August 29, 2001 3:14 PM
Subject: Re: LSP ID in LSR MIB


Neelesh,
       With regards to your questions
       1)You can have the LSPID as an array of unsigned chars
        for example  192.168.1.10:1  where this is the LSPID
        The 192.168.1.10 is the source address and 1 is the local lspid.
        Similar relevance can be applied to RSVP piggyback.
       2)Piggyback is the Label mapping message for a pending label request
message
         here you only update the label value returned by the signaling
protocol
         Hope this helps,
         Regards,
         Abhay

Neelesh Dwivedi wrote:
Hello,
I have  few doubts related to the MPLS LSR MIB
(draft-ietf-mpls-lsr-mib-07.txt).
The Cross-Connect Table has an entry
       mplsXCLspId                 MplsLSPID
 This MplsLSPID is described in  draft-ietf-mpls-tc-mib-02.txt as
 "An identifier that is assigned to each LSP and is used to uniquely
identify
it.  This is assigned at the head end of the LSP and can be used by all LSRs
to identify this LSP.  This value is piggybacked by the signaling protocol
when this LSP is signaled within the network.  This identifier can then be
used at each LSR to identify which labels are being swapped to other
labels for this LSP.  For IPv4 addresses this results in a 6-octet long
cookie."
SYNTAX        OCTET STRING (SIZE (0..31))
 My questions are:
a)  Is there any standard format for this unique identifier ? If not, then
what can be the possible ways to assign it?
 b) What do we mean by "piggybacking" this value by the signaling protocol?
If it is to be advertised in some control message then where and how do
we do it?
 Regards,
Neelesh.
 Mercury Corporation
New Delhi R&D Centre,
Gurgaon, India.