Layer 2 Tunneling Protocol Version 3 is a draft version of
L2TPthat is proposed as an alternative protocol to MPLSfor encapsulation of multiprotocol Layer 2communications traffic over IP networks. Like L2TP, L2TPv3 provides a ‘ pseudo-wire’ service, but scaled to fit carrier requirements.
L2TPv3 can be regarded as being to
Multiprotocol Label Switching(MPLS) what IP is to ATM: a simplified version of the same concept, with much of the goodness achieved with a fraction of the effort, at the cost of losing some technical features considered less important in the market. In the case of L2TPv3, the features lost are teletraffic engineeringfeatures considered important in MPLS. The protocol overheadof L2TPv3 is also significantly bigger than MPLS. However, there is no reason why these features could not be re-engineered in or on top of L2TPv3 in later products.
* [http://www.ietf.org/html.charters/l2tpext-charter.html IETF L2TPEXT working group]
* [http://www.ripe.net/ripe/meetings/ripe-42/presentations/ripe42-eof-pseudowires2/index.html RIPE presentation about L2TPv3]
* [http://tools.ietf.org/html/rfc3931 L2TPv3 RFC]
* [http://tools.ietf.org/html/rfc2661 L2TP RFC]
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