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MPLS L2VPN Overview
615
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.
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.
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.
MPLS L2VPN services are provided through statically configured VC labels. An
example of this is CCC, which implement MPLS L2VPNs through static
configuration.
Table 563 describes the features and implementation ways of the above three
types of MPLS L2VPNs.
types of MPLS L2VPNs.
Table 563 Features and implementation ways of the three types of MPLS L2VPNs
VPN type Implementation
Feature
CCC
Configures static LSPs to implement
MPLS L2VPN.
MPLS L2VPN.
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.
(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.
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.
Layer 2 VPN information. Only MPLS
forwarding is required. In this way, CEs
of different SPs can be interconnected
easily.
Martini
Uses extended LDP as the signaling to
transmit the VC information.
transmit the VC information.
Uses VC-TYPE and VC-ID to identify
VCs. VC-TYPE indicates the
encapsulation type of data link layer,
and VC-ID uniquely identifies a VC.
VCs. VC-TYPE indicates the
encapsulation type of data link layer,
and VC-ID uniquely identifies a VC.
PEs connecting CEs exchange VC labels
through LDPs. They bind the
corresponding CEs through VC-IDs.
through LDPs. They bind the
corresponding CEs through VC-IDs.
Local switching like CCC is not
available.
available.
An LSP can be shared by multiple VCs.