The MPLS WG Archive

[David Charlap <david.charlap@marconi.com>]

manoj juneja wrote:
> 
> If S1, S2 can be reachable through incoming interface I1 and require
> bandwidth 1M and 2M respectively. The senders S3, S4 falling under
> the same session (as of S1 and S2) require bandwidth 5M and 10M
> respectively but reachable through different incoming interface I2.
> Do I still need to reserve 10M on both the incoming interfaces (i.e.
> I1 and I2) ? Even though we are aware that only 2M (larger of S1,
> S2) will be utilized on I1. Why is it defined like this in the
> protocol ?

Because it's a single _SHARED_ reservation.  It's not four separate
reservations that happen to share resources where convenient.

When the egress router sends an SE-style Resv message, there is exactly
_ONE_ flowspec object transmitted, which covers _ALL_ of the filterspecs
in the flow descriptor.

What I don't understand is why you think you should put LSPs with
different incompatible resource requirements in the same session
together.

-- David