Mpls L2Vpn Frame Format - 3Com 3C13636 Configuration Manual

3Com Router 3000 Ethernet Family
Configuration Guide
VPN A VPN A
CE CE
VPN B VPN B
Figure 4-1 L2VPN
MPLS L2VPN offers the following benefits:
Support multiple link-layer protocols to provide L2VPN services based on different
media on the MPLS network, including ATM (ATM ALL5 and ATM cell relay), FR,
VLAN, Ethernet, PPP, HDLC etc.
Support multiple network layer protocols, such as IP, IPv6, IPX and SNA.
It provides multiple services, including L3VPN, traffic engineering, QoS etc.
Excellent scalability. MPLS L2VPN only establishes L2 connections for users and
does not redistribute and manage the routing information of users. Thus, the load
on PE and the entire SP network can be significantly reduced. Thereby, the SP
can support more VPNs and provide the access service for more subscribers.
Guaranteed reliability and privacy of subscriber route. As MPLS L2VPN is not
required to redistribute routing information of subscribers, it has neither needs nor
means to obtain and process routes of subscribers. Thus, it guarantees the
privacy of subscribers' routes.

4.1.2 MPLS L2VPN Frame Format

MPLS L2VPN frames are in such format:
Control word
Figure 4-2 MPLS L2VPN frame format
PE PE
VC VC
LSP LSP
P P
CE CE
Tunnel label
Label stack
3Com Corporation
Chapter 4 MPLS L2VPN Configuration
VC VC
PE PE
P P
PE PE
CE CE
VC label
L2 PDU
4-2
CE CE
VPN A VPN A
VPN B VPN B