Hi Bala,
In this example the LSP does not have an explicit class-of-service defined
under the LSP configuration.
Therefore, the IP TOS bits are written into the MPLS EXP bits when exiting
the LER router via the relevant output Q.
On subsequent hops the LSRs which have input mpls-cos-map enabled will map
each of the mpls packets into the correct output Q's depending on the EXP
bits.
The scenario you describe would only happen if the LSP had an explicit
class-of-service configured.
hope this helps
Gary
>-----Original Message-----
>From: Bala Subrahmanyam Venkata [mailto:bsubrahm@doradosoftware.com]
>Sent: 09 August 2001 19:17
>To: juniper-nsp@puck.nether.net
>Subject: RE: Need help with MPLS configuration example
>
>
>Andrew-
>
>To interrupt your thread, if you do this (map 3 flows each
>with different
>TOS marking to the same LSP) then you'll end up with ONE LSP
>that carries
>the traffic that you have differentiated via TOS values...do
>you want that
>(some sort of "TOS merge") ? The reason is anyway traffic in
>one LSP can be
>mapped to only ONE output queue (via "mpls-cos-map" ). If this
>happens then
>the differentiation you made by setting the TOS values is lost
>right ? Since
>all of them will be put in the same queue.....or am I missing
>something ??
>
>
>/bala
>
>
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