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Posted by stephen on March 14, 2007, 4:46 pm
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> What are the advantage of using MPLS Vs. Point to Point circuits?
you are really comparing apples with oranges.
MPLS access links would normally use a point to point circuit anyway.
MPLS proper is the "cloud" bit operated by the carrier
in most setups the label switching bit is only within the carrier core
network, and will not go as far as a customer site - so they could be
plugging all those access links into a central router instead....
I
> know MPLS offers a Mesh.
some services do - it sounds like you are referring to a L3 VPN over MPLS.
But some MPLS services across are point to point - Ethernet L2 circuit
emulation is common.
>
> Is QoS better on a MPLS vs Point to Point? It appears to be no
> difference to me because QoS would just be configured on the router
> interfaces of a point to point circuit.
The access links to / from a customer site run IP, so no difference.
The MPLS core QoS field inside a label is only 3 bits, so the "native" per
packet QoS is less rich than say DSCP.
Since the backbone tends to be much faster than customer access links that
may not matter (as if you never have packets building up in a Q there is not
much QoS can do to re-order traffic).
Some MPLS backbones dont do any QoS handling in the core, but just at the PE
router where customer links meet the high bandwidth bit, since it is
sometimes simpler and easier for the carrier to throw bandwidth at the
problem
>
>
> All responses are greatly appreciated. Thank You
>
--
Regards
stephen_hope@xyzworld.com - replace xyz with ntl
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