The MPLS-OPS Archive

[Eric Osborne <eosborne@cisco.com>]

On Mon, Dec 16, 2002 at 03:53:09AM +0000, NOC Ops wrote:
> I see three different perspectices:
> 
> #1
> Frame Relay and ATM can be used as feeder access links to an MPLS core 
> network. IE: IPoFR and IPoATM. See ATM alot in DSL networks.....Frame Relay 
> aloi in Leased Line replacement services.
> 
> #2
> Frame Relay and ATM may be carried with an MPLS Core, encapped in MPLS 
> headers. I cannot recall all the methods, but one is PWE3. Kompella and 
> Martini may do some or all of PWE3 also.

There are two Martini drafts; one is signalling, one is
encapsulation.  There are various other drafts talking about different
types of signalling to solve different problems, but AFAIK every new
proposal uses Martini encap.

> 
> #3
> And ATM Core, (NOTE: Not Frame Relay) maybe upgraded or built from scratch 
> that also supports MPLS. This is commonly known as Ships in the Night. IE: 
> An ATM Switch that will Cell Switch ATM only Cells and at the same Time is 
> able to perform MPLS Labeling on IP/MPLS traffic.

This mode is defined for FR, but there are no implementations that I
know of.  rfc3034.  And it's not that a switch performs "mpls
labeling" (which to me implies label push), but that you can use the
VCI/DLCI value as a label.  Eliminates overlay topologies over ATM/FR
cores.

Also add #4 - ATM/FR in the backbone in what is called "frame mode"
(as opposed to "cell mode" in #3), carrying MPLS packets just like IP
packets are carried.



eric

> 
> Clear as mud?
> 
> 
> 
> >From: Jawad Khalid Mirza <khalid1690@yahoo.com>
> >To: mpls-ops@mplsrc.com
> >Subject: [MPLS-OPS]: Help
> >Date: Sun, 15 Dec 2002 15:37:34 -0800 (PST)
> >
> >Hi there
> >Pls tell me, How MPLS works with Frame relay and ATM
> >in Provide core network, or how we integrate MPLS with
> >FR and ATM
> >
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