Subject: RE: [mpls] Unique Identififcation of LSP

From: <[email-masked]>
Date: Thu, 30 Nov 2006 08:39:11 -0000

I believe we should add these observations:

-	this only applies to this particular signalling protocol;

-	it does not apply in the traffic data-plane.  That is, one does
not have such information here, just a single (20 bit) forwarding label
that can be changed on each link connection and which is proxying for
some distant LSP termination point.  This has implications wrt
identifying/distinguishing misconnectivity between LSPs..... noting that
this can occur in both a horizontal sense (ie between LSPs created at
the same level in a nested stack) and a vertical sense (ie between LSPs
created at different levels in the stack).....be these generated by the
same or different signalling protocols.

regards, Neil

> -----Original Message-----
> From: George Swallow [mailto:[email-masked]] 
> Sent: 29 November 2006 18:53
> To: Anergy Virt
> Cc: [email-masked]
> Subject: Re: [mpls] Unique Identififcation of LSP 
> 
> 
> > I have read that the 5-tuple {tunnel-endpoint address,tunnel-ID, 
> > extended tunnel-ID, sender address, and LSP ID} can 
> uniquely identify 
> > an LSP. My question is it locally unique between two nodes 
> or globally 
> > unique identifcation
> > 
> > A----B-----C------E
> >        \     /
> >          D
> > 
> > For example two LSPs are set up from A to E via the same 
> tunnel. i.e. 
> > the have same end points and same path ABDE. Will the 5 
> tuple uniquely 
> > identify any LSP across any two nodes e.g. B and D? Will the values 
> > remain same for this LSP across two other nodes in the path 
> e.g. C and 
> > E?
> 
> Yes, provided that the extended tunnel ID is a globally 
> unique id. (Normally this is set to the head-end's router ID).
> 
> ...George
> 
> ==============================================================
> ==========
> George Swallow             Cisco Systems                  
> (978) 936-1398
>                            1414 Massachusetts Avenue
>                            Boxborough, MA 01719
> 
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