Vpls Implementation - HP 10500 Series Configuration Manual

• PE—A provider edge device connects one or more CEs to the service provider network. A PE
implements VPN access by mapping and forwarding packets between private networks and public
network tunnels. A PE can be a UPE or NPE in a hierarchical VPLS.
AC—An attachment circuit, physical or virtual, connects a CE and a PE, such as an Ethernet link or
•
a VLAN. On the HP 10500 series, an AC is a service instance on a Layer 2 Ethernet port.
PW—A pseudowire is a bidirectional virtual connection between two PEs. An MPLS PW consists of
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two unidirectional MPLS LSPs in opposite directions.
Tunnel—A tunnel can be an LSP tunnel, an MPLS TE tunnel, or a GRE tunnel. It carries one or more
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PWs over an IP/MPLS backbone.
VPLS instance—A customer network might include multiple geographically dispersed sites (such as
•
site 1 and site 3 in
single Layer 2 VPN, which is referred to as a "VPLS instance." Sites in different VPLS instances
cannot communicate with each other at Layer 2.
VSI—A virtual switch instance provides Layer 2 switching services for a VPLS instance on a PE. A VSI
•
acts as a virtual switch that has all the functions of a conventional Ethernet switch, including source
MAC address learning, MAC address aging, and flooding. VPLS uses VSIs to forward Layer 2 data
packets in VPLS instances.

VPLS implementation

Creating a PW
To create a PW between PEs in the same VPLS instance, follow these steps:
Manually specify the address of the peer PE.
1.
Configure PW labels manually, or automatically through LDP.
2.
Manual configuration: On each PE, assign an incoming label and an outgoing label to create
the PW.
Automatic configuration: On each PE, configure LDP to assign and advertise the PW label to
the peer PE to establish a unidirectional LSP. The two unidirectional LSPs between the PEs form
a PW.
If the PW is carried on an LSP or MPLS TE tunnel, each packet on the PW contains two labels. The
inner label is the PW label, which identifies the PW of the packet and makes sure the packet is
forwarded to the correct VSI. The outer label is the public LSP or MPLS TE tunnel label, which makes
sure the packet is correctly forwarded between the PEs.
MAC address learning, aging, and withdrawal
VPLS provides reachability through source MAC learning. A PE maintains a MAC address table for each
VSI.
As shown in
• Learning the source MAC addresses of directly connected sites
Figure 71.) The service provider uses VPLS to connect all the sites to create a
Figure 72, a PE learns source MAC addresses in the following ways:
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