- L2TPv3
Layer 2 Tunneling Protocol Version 3 is a draft version of
L2TP that is proposed as an alternative protocol toMPLS for encapsulation of multiprotocolLayer 2 communications 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 areteletraffic engineering features considered important in MPLS. The protocoloverhead of 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.External links
* [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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