Implementation - H3C S9500 Series Operation Manual

Routing switches

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Operation Manual – MPLS

H3C S9500 Series Routing Switches

L2 PDU: Data link layer packet

T: Tunnel label

Figure 4-3 Label stack processing of MPLS L2VPN

4.1.3 Implementation

At present, the official standard for MPLS L2VPN has not been established yet.

However, the PPVPN (Provider-provisioned Virtual Private Network) group of IETF

(Internet Engineering Task Force) defines multiple framework drafts, two of which are

commonly used. They are known as Martini draft and Kompella draft. Till May, 2005,

they are depicted in the following documents respectively:

draft-martini-l2circuit-trans-mpls-09.txt

draft-kompella-ppvpn-l2vpn-02.txt

Martini draft defines the way to implement MPLS L2VPN by establishing point-to-point

links. Here, LDP (Label Distribution Protocol) is used as the signaling protocol to

exchange VC labels. This kind of MPLS L2VPNs is known as Martini MPLS L2VPNs.

Kompella draft defines how to establish MPLS L2VPNs in MPLS networks through

end-to-end (CE-to-CE) connections. At present, BGP (border gateway protocol) is used

as the signaling protocol to propagate the information about Layer 2 reachability and

VC labels. This kind of MPLS L2VPNs is known as Kompella MPLS L2VPN.

Also, you can establish MPLS L2VPNs without signaling protocols. In this case, MPLS

L2VPN services are provided through statically configured VC labels. An example of

this is CCC, which implement MPLS L2VPNs through static configuration.

Table 4-1 describes the features and implementation ways of the above three types of

MPLS L2VPNs.

Chapter 4 MPLS L2VPN

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S9505 S9508 S9512