effect, a VPLS instance is a new or existing bridge group that has additional VPLS
attributes configured.
A bridge group is a collection of bridge interfaces stacked on Ethernet layer 2
interfaces to form a broadcast domain. Similarly, a VPLS instance is a collection of
network interfaces stacked on Ethernet layer 2 interfaces that transmits packets
between the router, or VE device, and the CE device located at the edge of the
customer’s network. In addition, the VPLS virtual core interface enables a VPLS
instance to forward traffic not only between bridge interfaces, like a bridge group,
but also between a bridge (network) interface and the service provider core.
Like a bridge group, each VPLS instance maintains its own set of forwarding tables
and filters that enables it to learn the network topology by examining the media
access control (MAC) source address of every incoming packet. The VPLS instance
then creates an entry in its forwarding table that includes the MAC address and
associated network interface where the packet was received. For traffic on the VPLS
virtual core interface, the VPLS instance captures additional information that includes
an outgoing MPLS label used to reach the remote site and an incoming MPLS label
used to process traffic received from the remote site.
Table 74 on page 578 through Table 77 on page 579 represent the forwarding tables
on PE 1 and PE 2 for the sample VPLS topology illustrated in Figure 128 on page 576.
Table 74: VPLS Forwarding Table on PE 1 for VPLS A
Received LabelOutgoing LabelMAC AddressInterface
––1a1a.1a1a.1a1aFast Ethernet 3/1
324183a3a.3a3a.3a3aVPLS virtual core interface
Table 75: VPLS Forwarding Table on PE 1 for VPLS B
Received LabelOutgoing LabelMAC AddressInterface
––2b2b.2b2b.2b2bBridged Ethernet 2/0.12
526254b4b.4b4b.4b4bVPLS virtual core interface
Table 76: VPLS Forwarding Table on PE 2 for VPLS A
Received LabelOutgoing LabelMAC AddressInterface
––3a3a.3a3a.3a3aFast Ethernet 3/5
107421a1a.1a1a.1a1aVPLS virtual core interface
578 â– VPLS and Transparent Bridging
JUNOSe 11.1.x BGP and MPLS Configuration Guide
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