Hi, Gary
Thanks for the reply. It was very helpful! I have
one more question.
Say, I have 3 traffic streams that I want to have them
travel through the same LSP. Is it possible to mark
these 3 streams with different COS bits under the same
LSP?
Also, does MPLS COS bit mapping has anything to do
with the singnalling protocol itself? (RSVP, LDP)
Thanks a lot for your email.
Best Regards,
Andrew
--- Gary Tate <gtate@juniper.net> wrote:
> Hi Andrew,
>
> For more details check the of the JunOS
> Documentation 'Interfaces and
> Chassis, Section Class-of-Service at:
>
> http://www.juniper.net/techpubs/software.html
>
> Quick pointers:
>
> First you need to know that the mapping for MPLS
> packets to output Queues is
> done in hardware (not configurable like IP
> precedence mapping) and the
> following table shows the EXP bits to Queue mapping
>
> EXP
> 0 000
> 1 001 Q0
> --------------
> 2 010
> 3 011 Q1
> --------------
> 4 100
> 5 101 Q2
> --------------
> 6 110
> 7 111 Q3
> --------------
>
> Here is an example:
>
> Router A -- Router X -- Router Y -- Router B
> 0.1 0.2 0.3 0.4
>
> Router A:
>
> The EXP bits are set using the class-of-service knob
> in the LSP
> configuration:
>
> protocols {
> mpls {
> label-switched-path to-B-via-X {
> to 192.168.0.4;
> primary via-X-Y;
> class-of-service 4; <<<< Set EXP bits
> 100 > output Q2
> }
> path via-X-Y {
> 192.168.0.2 loose;
> 192.168.0.3 loose;
> }
> interface all;
> }
> }
>
> The IP TOS/Precedence bits are not changed only the
> ingress MPLS EXP bits
> are written to 100 and MPLS packets mapped to output
> Q2.
>
> Router X:
> ---------
> class-of-service {
> input {
> interfaces {
> so-a/a/a { <<< From router A
> mpls-cos-map; <<< apply mpls map
> }
> }
> }
> }
>
> Router y:
> ---------
> class-of-service {
> input {
> interfaces {
> so-x/x/x { <<< From router x
> mpls-cos-map; <<< apply mpls map
> }
> }
> }
> }
>
> The class-of-service shown, maps incoming MPLS
> packets to output queues, as
> per the MPLS EXP bits to Queue mapping shown above.
> (In this case the
> packets from our LSP (EXP 100) will be mapped to
> output Q2).
>
> Last note - each router in the path must have the
> mpls-cos-map on each input
> interface in the LSP path. If this is omitted (e.g.
> on route Y) then the
> default is to map MPLS packets to output Q0 and the
> EXP bits are written to
> 000.
>
> Hope this helps
>
> Gary Tate
>
> >-----Original Message-----
> >From: Andrew Smith [mailto:as160@yahoo.com]
> >Sent: 05 August 2001 07:03
> >To: juniper-nsp@puck.nether.net
> >Subject: Need help with MPLS configuration example
> >
> >
> >Hi, all
> >
> >Can someone kindly point me to a config example on
> how
> >to set the MPLS EXP field in JunOS? Is it possible
> to
> >keep the IP prec bit and just to mark the EXP bit?
> >
> >Thanks a lot.
> >---andrew
> >
> >__________________________________________________
> >Do You Yahoo!?
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> >
> >
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