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Posted by Albert Manfredi on August 28, 2006, 3:38 pm
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>I am trying to understand why the current access networks are going
> towards ethernet based systems. We already have MPLS on the core
> network side. Now we have ethernet on the access side.
>
> We use VLAN and 802.1q tags for QOS in the ethernet. Why cant we have
> MPLS everywhere and dont have to worry anything else. MPLS already
> does
> the QOS for us.
Because MPLS establishes paths among layer 3 boxes, routers, and not
inside a layer 2 network.
You could use MPLS in small geographic areas, in principle, but that
would mean setting up a lot of small IP subnets first. Most nets are not
set up that way, but there's no reason to think they can't be. Make
every Ethernet switch a router, for example.
As to "current access networks," they have traditionally been Ethernet
for a good many years. I mean, leaving aside the other old standby,
which was modem over a POTS line.
Bert
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