Implementation - H3C S9500 Series Operation Manual

Operation Manual – MPLS VLL
H3C S9500 Series Routing Switches

1.1.4 Implementation

At present, the official standard for MPLS VLL 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 VLL 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 VLLs is known as Martini MPLS VLLs.
Kompella draft defines how to establish MPLS VLLs 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. Such MPLS VLLs are known as Kompella MPLS VLLs.
Also, you can establish MPLS VLLs without signaling protocols. In this case, MPLS VLL
services are provided through statically configured VC labels. An example of this is
CCC, which implement MPLS VLLs through static configuration.
Table 1-2
MPLS VLLs.
Table 1-2 Features and implementation ways of the three types of MPLS VLLs
VPN type
CCC
describes the features and implementation ways of the above three types of
Implementation
Configures static LSPs to
implement MPLS VLL.
You must manually configure two
LSPs (for sending and receiving
packets respectively) for each
CCC connection node by node
(including PEs and Ps). The
configured LSPs can only be used
to transmit packets of the
corresponding CCC connections.
Data is transmitted through
packets with single-layer
labels. LSPs are used
exclusively.
No signaling is needed to
transmit the Layer 2 VPN
information. Only MPLS
forwarding is required. In this
way, CEs of different SPs can
be interconnected easily.
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Chapter 1 MPLS VLL
Feature