Juniper JUNOSE, Configuration Manual

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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 73 on page 572 through Table 76 on page 573 represent the forwarding tables
on PE 1 and PE 2 for the sample VPLS topology illustrated in Figure 128 on page 570.
Table 73: VPLS Forwarding Table on PE 1 for VPLS A
Received Label Outgoing Label MAC Address Interface
– – 1a1a.1a1a.1a1a Fast Ethernet 3/1
324 18 3a3a.3a3a.3a3a VPLS virtual core interface
Table 74: VPLS Forwarding Table on PE 1 for VPLS B
Received Label Outgoing Label MAC Address Interface
– – 2b2b.2b2b.2b2b Bridged Ethernet 2/0.12
526 25 4b4b.4b4b.4b4b VPLS virtual core interface
Table 75: VPLS Forwarding Table on PE 2 for VPLS A
Received Label Outgoing Label MAC Address Interface
– – 3a3a.3a3a.3a3a Fast Ethernet 3/5
107 42 1a1a.1a1a.1a1a VPLS virtual core interface
572 ■
VPLS and Transparent Bridging
JUNOSe 11.0.x BGP and MPLS Configuration Guide