MPLS is also useful as a VPN provisioning tool in
the Metro space,
especially to allow the provisioning of end-to-end PVCs regardless
2 transport. For example, a service provider could use MPLS-VPNs
sites on its Ethernet MAN to sites on its DSL or Frame Relay services.
Also, you may wish to check out Riverstone's collection of papers on
Etherent, MANs and MPLS available at:
and the MPLS Resource Center -
From: srihari varada [mailto:email@example.com]
Sent: Thursday, November 15, 2001 11:12 AM
Subject: MPLS in metro access networks
I have heard some stressing the role of MPLS in metro access networks.
It is difficult for me to visualize the need for it in them while it
is not so difficult to understand the utility (load balancing and fault
restoration etc.) of it in the metro backbone networks.
To characterize metro access networks in the context, the following
-- aggregates traffic from residential (arriving via broadband access
links such as xDSL, Cable) and business consumers (arriving
broadband access links such as
xDSL and high speed links such as Ethernet or SONET)
-- funnels aggregated traffic to metro backbone networks for destination
hosts in the local metro region or remote regions
and backbone networks. Majority of such access networks
based (I didn't come
across any case of Gig Ethernet. However, I do not preculde
Thus, there are two questions:
-- Are there known RBOCs/ILECs and CLECs entrenching MPLS in the said
network scope? (I do not see many major ILECs in the un-official
providers list being circulated but it may mean little)
-- If so, what motivates them to do so? Any analysis of the driving
forces is appreciated.