H3C Technologies H3C S12500-X Series Switches - Manual (Page 296)

285
Multicast and broadcast traffic forwarding and flooding:
After a PE receives a multicast or broadcast packet from an AC, the PE floods the packet to all other ACs
and the PWs in the VSI bound to the AC.
After a PE receives a multicast or broadcast packet from a PW, the PE floods the packet to all ACs in the
VSI bound to the PW.
PW full mesh and split horizon
A loop prevention protocol such as STP is required in a Layer 2 network to avoid loops. However,
deploying a loop prevention protocol on PEs brings management and maintenance difficulties. Therefore,
VPLS uses the following methods to prevent loops:
• Full mesh—Every two PEs in a VPLS instance must establish a PW to create a full mesh of PWs
among PEs in the VPLS instance.
• Split horizon—A PE does not forward packets received from a PW to any other PW in the same VSI
but only forwards those packets to ACs.
Configuration task list
To configure a VPLS network, complete the following tasks:
• Configure an IGP to ensure IP connectivity within the backbone network.
• Configure basic MPLS, LDP, or MPLS TE to establish public tunnels on the backbone network.
• Configure VPLS on PEs. For example, configure a VSI, establish a PW, and associate an AC and a
VSI.
This chapter describes only VPLS configurations on a PE. For more information about other configurations,
see relevant configuration guides.
To configure VPLS on a PE, perform the following tasks:
Tasks at a glance Remarks
(Required.) Enabling L2VPN N/A
(Required.) Configuring an AC N/A
(Required.) Configuring a VSI N/A
Configuring a PW :
• (Optional.) Configuring a PW class
• (Required.) Choose either of the following tasks to configure a PW:
{
Configuring a static PW
{
Configuring an LDP PW
Choose a PW configuration
method depending on the VPLS
implementation.
(Required.) Binding an AC to a VSI N/A
(Required.) Configuring MAC address learning N/A
Enabling L2VPN
Perform this task to enable L2VPN on the PE.