I-D ACTION:draft-raggarwa-ppvpn-tunnel-encap-sig-02.txt

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	Title		: Signaling Tunnel Encapsulation/Deencapsulation Capabilities
	Author(s)	: R. Aggarwal
	Filename	: draft-raggarwa-ppvpn-tunnel-encap-sig-02.txt
	Pages		: 8
	Date		: 2004-2-10
	
This document proposes a 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.

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