[c-nsp] Re: 7600, DFC's and MPLS

[Ian Cox]

At 01:11 PM 1/4/2006 -0500, Chris Griffin wrote:
>I had seen some information that led me to believe that label imposition
>was still done on the PFC, and that label switching was done on the DFC,
>but I could never get a straight answer on that.  Anyone?

The ingress line cards forwarding engine is responsible for making 
the forwarding decision for all packets. If the ingess line card has 
a DFC, then it makes the decision. Traffic that ingresses on line 
cards without a DFC use the PFC to make the forwarding decision. This 
applied to all protocols supported in hardware, L2 and L3 switching 
(IPv4, IPv6, MPLS, tunnels), and features such as NAT/PAT done in the 
forwarding ASICs.


Ian


>Chris
>
>Kristofer Sigurdsson wrote:
> > Never mind about the first question (the DFC one), found this:
> >
> > "The Distributed Forwarding Card-3 replicates Layer 2 and 3 
> forwarding logic
> > of the Supervisor 720's PFC-3 on each DFC-3 equipped linecard. This enables
> > hardware acceleration of IPv6, MPLS, GRE, QoS, ACL policy enforcement and
> > more."
> >
> > Thanks,
> > Kristofer
> >
> > 2006/1/4, Kristofer Sigurdsson <kristosig at gmail.com>:
> >
> >>Hi,
> >>
> >>Now, I'm not very experienced with the 7600 platform, so bear with me. :)
> >>
> >>I have two questions regarding the use of MPLS on the Sup720-3BXL.  From
> >>what I can
> >>gather, I can use MPLS on LAN ports using this supervisor.  However, if I
> >>use DFC3 cards
> >>on 67xx modules, bringing the forwarding decision to the line card, can I
> >>still use MPLS?  Can the
> >>line card, equipped with a DFC3, make forwarding decisions based on MPLS?
> >>
> >>Also, SIP modules.  Any points on using those as opposed to OSMs for
> >>non-ethernet WAN interfaces?  Better, worse?
> >>
> >>Thanks,
> >>Kristofer
> >>
> >
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>--
>Chris Griffin                                cgriffin at ufl.edu
>Sr. Network Engineer - CCNP                  Phone: (352) 392-2061
>Network Services / Florida LambdaRail        Fax:   (352) 392-9440
>University of Florida                        Gainesville, FL 32611
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