Hi, Greg
Thanks. Now I am almost golden. :)
I still have some confusion about one of my previous
question. If I have IP streams with different TOS bit
set (say 0, 3, 7) and I want to them use the same LSP.
So you need to map the EXP bit into the queues. Is
it possible to map 3 different EXP bits under the same
LSPs along the transit LSRs or do you need 3 separate
LSPs to do the job?
Thanks a lot!
--- Greg Ketell <gketell@juniper.net> wrote:
> OK so here is the memory-refreshed deal:
>
> If your *IP* packets are classified on input on the
> LER (or via a previous
> IP hop router) and you have a forwarding path that
> is MPLS AND you don't
> specifically set the the LSP's EXP bits, then the IP
> packet's precedence
> bits will be copied to the MPLS EXP bits.
>
> Then on transit LSR you set mpls-cos-map so that you
> select the right Queue
> based on the EXP bits.
>
> Now you should be golden.
>
> GK
>
> At 10:00 PM 8/7/2001, Andrew Smith wrote:
> >Hi, Greg
> >
> >Many thanks on you and Gary's helpful input on
> this.
> >;) It will be great if you can show me a sample
> >config or a link to it.
> >
> >Best
> >Andrew
> >--- Greg Ketell <gketell@juniper.net> wrote:
> > > You are trying my memory (I haven't had to play
> with
> > > COS & MPLS together
> > > for some time).
> > >
> > > I'll dig around and try to get you the answer
> > > (unless someone else reading
> > > the list chimes in first).
> > >
> > > GK
> > >
> > > At 08:38 PM 8/7/2001, Andrew Smith wrote:
> > > >Hi,
> > > >
> > > >Thanks! Please ignore my second question. It
> > > wasn't
> > > >well thought of. 8)
> > > >
> > > >So, let me see if I understand it correctly.
> If I
> > > >assign COS value under one LSP, any traffic
> pass
> > > >through that LSP will have the COS value
> assigned.
> > > >
> > > >What do I need to configure for case two like
> you
> > > have
> > > >pointed below to work than? Let say I have IP
> > > packets
> > > >with Prec 7 coming, will this be copied into
> the
> > > COS
> > > >bit by default? I read the doc and it says by
> > > default
> > > >COS bit should be 0, right?
> > > >
> > > > > Yes. There are two ways we handle COS on
> MPLS.
> > > 1)
> > > > > The LSP is given a
> > > > > certain COS and any packets sent into it are
> > > treated
> > > > > accordingly. 2) The
> > > > > COS of the IP Packet is copied into the MPLS
> > > header
> > > > > and we treat each MPLS
> > > > > payload accordingly.
> > > >
> >
> >
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