The MPLS WG Archive

[Eric Gray <EGray@zaffire.com>]

Sharam,

	In CR-LDP, the LSP-ID TLV consists of an IP
address of the ingress LSR and a locally unique
identifier.  Because it can be any address of the
ingress LSR, it does not have to be an address the
egress LSR will recognize (although it should be a
"legal" address - i.e. not private or unregistered).

	Therefore, I'm not sure how useful it is to 
try to recapture information on the ingress LSR 
using the LSP-ID TLV.

--
Eric Gray


> -----Original Message-----
> From: Shahram Davari [mailto:Shahram_Davari@pmc-sierra.com]
> Sent: Tuesday, May 30, 2000 7:27 AM
> To: 'dwilder@baynetworks.com'; Tan Su Wei
> Cc: mpls@UU.NET
> Subject: RE: can egress know the ingress of a packet?
> 
> 
> Hi,
> 
> I think in CR-LDP you may use LSP-ID TLV, which will give you 
> the tunnel
> ingress and the LSP ID. And in RSVP-TE you may use the Sender Template
> Object, which will give you the same information. RRO may 
> also be used in
> RSVP-TE, however you only will get the ingress LSR 
> information that you
> need, but not which LSP it is coming from.
> 
> Regards,
> -Shahram
> 
> >-----Original Message-----
> >From: dwilder@baynetworks.com [mailto:dwilder@baynetworks.com]
> >Sent: Tuesday, May 30, 2000 10:01 AM
> >To: Tan Su Wei
> >Cc: mpls@UU.NET
> >Subject: Re: can egress know the ingress of a packet?
> >
> >
> >Can we use the Record route Object for this?
> >
> >Dave
> >
> >> Dear all,
> >> 
> >>     I'd a doubt on :
> >>         In a mpls network domain, for a particular 
> >ingress-egress pair
> >> with multiple LSPs in between them, is it possible when a 
> >packet reach
> >> the engress node, the engress node will know the following:
> >>         i. ) the ingress node
> >>         ii.) the lsp it travel
> >> 
> >>         Thanks for any reply.
> >> 
> >> Regards
> >> Tan Su Wei
> >> 
> >> 
> >> 
> >
>