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I-D ACTION:draft-raggarwa-ppvpn-tunnel-encap-sig-00.txt

A New Internet-Draft is available from the on-line Internet-Drafts directories.

	Title		: Signaling Tunnel Encapsulation/Deencapsulation 
	Author(s)	: R. Aggarwal et al.
	Filename	: draft-raggarwa-ppvpn-tunnel-encap-sig-00.txt
	Pages		: 9
	Date		: 2003-2-24
This document proposes a lightweight mechanism for signaling a PE 
router's tunnel encapsulation capabilities. One example is its 
capability to encapsulate MPLS using dynamic GRE and/or IP. This is 
applicable when a MPLS packet is tunneled using dynamic GRE and/or 
IP encapsulation [MPLS-IP-GRE] between PE routers. For instance the 
MPLS packet may be a 2547 based MPLS VPN packet [2547bis], a layer 2
packet transported using MPLS [MARTINI], a MPLS tunneled IPv6 packet 
or a MPLS IPv6 VPN packet [BGP-VPN-IPv6]. Adding such a mechanism has 
several benefits. It helps in blackhole avoidance and eases 
transitioning from MPLS tunneling based Layer 3/Layer 2 VPNs to GRE/IP 
tunneling based Layer 3/Layer 2 VPNs (and vice versa). Such a mechanism 
is needed where a network may be using MPLS and GRE (or IP) for 
tunneling, simultaneously in different parts of the network. It can 
help in encapsulation selection when multiple tunneling technologies
are supported. It can also be used to facilitate the use of security 
mechanisms in the network backbone.

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