Re: [mpls] entropy label indicator labelindraft-kompella-mpls-entropy-label

In message <04d401cb2e44$e45dfdd0$c7728182@china.huawei.com>
Yong Lucy writes:
>  
> Yes, each egress PE reserves its own ELI label value. Ingress PEs need
> remember each PE reserved ELI label. For a large network, one PE may send
> packets to many PEs.
>  
> Cheers,
> Lucy 

An LSR doing TE can afford another 20 bits of memory per node in
addition to the existing OSPF-TE and ISIS-TE information.  An LSR
doing PW can afford another 20 bits per T-LDP session.

BTW- (question to authors) does the FEC approach for LDP work for
MS-PW where the ingress and egress do not have a direct T-LDP
adjacency?

Curtis

> > -----Original Message-----
> > From: mpls-bounces@ietf.org [mailto:mpls-bounces@ietf.org] On Behalf Of
> > Curtis Villamizar
> > Sent: Wednesday, July 28, 2010 2:38 AM
> > To: stbryant@cisco.com
> > Cc: mpls@ietf.org
> > Subject: Re: [mpls] entropy label indicator labelindraft-kompella-mpls-
> > entropy-label
> > 
> > 
> > In message <4C4EEC02.2040202@cisco.com>
> > Stewart Bryant writes:
> > >
> > > John
> > >
> > > Why do you prefer to use an ELI as opposed to using a new set of FECs
> > > with the property that they are followed by an EL?
> > >
> > > Stewart
> > 
> > 
> > Stewart,
> > 
> > The same TE LSP can carry an IP payload and other MPLS LSP.  This
> > avoids confusing an entropy label with a forwarding label.
> > 
> > The egress does not have to know apriori whether the ingress is adding
> > an entropy label and the ingress is free to add an entropy label to
> > some but not all traffic.
> > 
> > The draft only provides LDP signaling.  TE signaling should also be
> > provided.  The entropy label can be a per host value (platform label
> > space) and it doesn't matter much where in OSPF-TE or ISIS-TE the TLV
> > is placed.
> > 
> > It would be nice if as we add further MPLS extensions we got the new
> > behavior we are looking for without making it such that MPLS-TP cannot
> > be accommodated on the same path and adding signaling to TE as well as
> > LDP is a small step in that direction.
> > 
> > Curtis
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