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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