The MPLS WG Archive

[Shahram Davari <Shahram_Davari@pmc-sierra.com>]

Hi,

If L-LSP is used then you need multiple LSPs, and each
Prefix+PSC will be considered as one FEC. So you have
the same number of FECs as the number of LSPs.

If E-LSP is used, you only need one LSP and one FEC which
is prefix-based only.

-Shahram

>-----Original Message-----
>From: Harish Kumtakar [mailto:harishk3@rediffmail.com]
>Sent: Monday, June 02, 2003 5:26 AM
>To: mpls@UU.NET
>Subject: help
>
>
>Hi,
>
>I've one question regarding MPLS (Context: MPLS support of 
>DiffServ).
>
>Consider a scenario where in a client (sender) H1 can send traffic 
>belonging to all classes of service (EF,AF,BE) to a destination 
>D1. And the traffic from H1 has to pass through a MPLS cloud to 
>reach D1. Let us also assume that all the routers in that MPLS 
>domain support DiffServ.
>
>Ingress router of this MPLS domain, which is attached to H1, has 
>to establish more than one LSPs for the same FEC (desination D1), 
>in order to service the traffic from H1.
>
>Now my question is, if there are more than one LSPs for the same 
>FEC then how the Ingress router will decide as to which LSP the 
>data packet belongs to since there will be more than one NHLFE 
>entries for the same FEC.
>
>Wonder if anyone comments on this. TIA.
>
>Regards,
>-Harish
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