Mac Address Learning And Flooding - HP 10500 SERIES Configuration Manual

PW signaling—The PW signaling protocol is the fundament of VPLS. It is used for creating and
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maintaining PWs and automatically discovering VSI peer PEs. Two PW signaling protocols are
available: LDP and BGP.
Figure 38 VPLS network diagram
Site 2
VPN 1
VPN 2
Site 3

MAC address learning and flooding

VPLS provides reachability by MAC address learning. Each PE maintains a MAC address table.
Source MAC address learning
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MAC address learning includes the following parts:
Remote MAC address learning associated with PWs
A PW consists of two unidirectional VC LSPs. A PW is up only when both of the VC LSPs are
up. When the inbound VC LSP learns a new MAC address, the PW must map the MAC
address to the outbound VC LSP.
Local MAC address learning of interfaces directly connected to users
This refers to learning source MAC addresses from Layer 2 packets originated by CEs. This
occurs on the corresponding VSI interfaces.
Figure 39 shows the procedure of MAC address learning and flooding on PEs.
Tunnel
PW
AC
Forwarder
CE 3
CE 4
CE 1
MPLS backbone
P
PE 1
PE 2
PWSignaling
164
Site 1
VPN 1
VPN 2
CE 2