Mpls L2Vpn Implementation - HP 12500 Series Configuration Manual
Mpls, routing switch series
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Also See for 12500 Series:
- Configuration manual (338 pages) ,
- Network management and monitoring command reference (320 pages) ,
- Command reference manual (157 pages)
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Figure 44
illustrates how the label stack changes in the MPLS L2VPN forwarding process.
Figure 44 MPLS L2VPN label stack processing
1) L2 PDU: Layer 2 protocol data unit
2) T represents tunnel label. V represents VC label. T' represents swapped tunnel label.
MPLS L2VPN implementation
MPLS L2VPN can be implemented in one of the following methods:
Circuit Cross Connect (CCC) and Static Virtual Circuit (SVC)—Two methods of implementing MPLS
•
L2VPN by configuring VC labels statically.
Martini—A method for establishing point-to-point links to implement MPLS L2VPN. It uses Label
•
Distribution Protocol (LDP) as a signaling protocol to transfer VC labels.
Kompella—A CE-to-CE mode for implementing MPLS L2VPN on the MPLS network. It uses
•
multiprotocol BGP as the signaling protocol to advertise Layer 2 reachability information and VC
labels.
The switch supports only Martini MPLS L2VPN. The following section describes the characteristics of
Martini MPLS L2VPN.
Martini MPLS L2VPN
The key of the Martini method is to set up VCs between CEs.
Martini MPLS L2VPN employs VC type and VC ID to identify a VC. The VC type indicates the
encapsulation type of the VC, which can be ATM, VLAN, or PPP. The VC ID uniquely identifies the VC
among the VCs of the same VC type on a PE.
The PEs connecting the two CEs of a VC exchange VC labels through LDP, and bind their respective CE
by the VC ID.
Once LDP establishes an LSP between the two PEs and the label exchange and the binding to CE are
finished, a VC is set up and ready to transfer Layer 2 data.
To allow the exchange of VC labels between PEs, the Martini method extended LDP by adding the
forwarding equivalence class (FEC) type of VC FEC. Moreover, as the two PEs exchanging VC labels may
not be connected directly, a remote LDP session must be set up to transfer the VC FEC and VC labels.
With Martini MPLS L2VPN, only PEs need to maintain a small amount of VC labels and LSP mappings
and no P device contains Layer 2 VPN information. Therefore, it has high scalability. In addition, to add
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