Motorola BSR 2000 Configuration And Management Manual page 586

BSR 2000 Configuration and Management Guide
With the VLAN Tagging feature, only one bridging CM can be configured for each
VLAN. All downstream packets received on the "trunk mode" Ethernet port of the
BSR are examined for VLAN tags. If a VLAN tag is present, the packet may be
bridged or routed depending on the tag value. If a VLAN tag is not present, the packet
will always be routed.
The BSR 2000 supports bridging of traffic received from CPEs behind a PacketCable
Embedded Multimedia Terminal Adapter (E-MTA) which is registered as a bridging
modem. Network traffic originating from the E-MTA will be routed while traffic from
the CPE will be bridged from the same E-MTA device. The BSR identifies the traffic
originating from an E-MTA device based on the source MAC address of Ethernet
frames received from it. The MAC address is extracted from the E-MTA's DHCP
packets. To distinguish DHCP packets recevied from an E-MTA device, Option 60
must be enabled with the Vendor Class ID set to "pktc1.0".
Note: Baseline Privacy Interface (BPI) should be configured for all CMs
enabled for bridging. Otherwise, downstream bridged multicasts and
broadcasts will be received by all subscriber CMs, not just the bridging CM.
13-6 MGBI
Release 1.0
526360-001-00 Rev. B