November 2006
Beginner
672 pages
15h 30m
English
Content preview from MPLS Fundamentals
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The Need for VPLS
VPLS is a service that emulates an Ethernet LAN. The need for VPLS arose because MPLS VPN is a service that is IP centric. No other Layer 3 traffic can be carried across the MPLS backbone with this service. Any Transport over MPLS (AToM) allows you to carry all Layer 3 protocols as AToM carries the Layer 2 frames across the MPLS backbone; thus, AToM is not limited to carrying IP. The disadvantage of AToM is that it is point-to-point. Between each pair of PE routers is a pseudowire (two LSPs, one for each direction) that carries the Layer 2 frames. Metro Ethernet networks have seen a tremendous rise in popularity in the past few years because Ethernet is cheap, flexible, omnipresent, and easy to provision.
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