526360-001-00 Rev. B
MGBI
13-1
13
Configuring VLAN Tagging
Introduction
The BSR 2000 normally acts as a IP router, forwarding only IP packets at ISO layer 3
between Customer Premises Equipment (CPEs) attached to DOCSIS cable modems
and a network port of the BSR 2000. The VLAN Tagging feature of the BSR
introduces the concept of bridging CPE Ethernet packets at ISO layer 2 onto a
particular Virtual Local Area Network (VLAN) appearing on a BSR Ethernet or
Gigabit Ethernet interface. The VLAN Tagging feature allows cable operators to offer
"Transparent LAN Service (TLS)" or "Layer 2 Virtual Private Network" to their
business enterprise customers while at the same time continuing to offer Internet
access via IP routing to their household subscribers.
The VLAN Tagging feature bridges packets in a point-to-point manner from one cable
modem to one IEEE 802.1Q VLAN. VLAN Tagging allows the BSR to forwards
traffic received from CPEs to a uniquely numbered VLAN using 802.1Q
industry-standard trunking encapsulation. The physical link used to forward traffic is
called a "trunk port". Trunk ports carry the traffic of multiple VLANs over a single
link and can extend a VLAN across an entire network. The BSR 2000 supports
VLAN-tagged bridging and routing IP traffic on the same trunk port. The routed IP
traffic may configured to be tagged or untagged.
Содержание BSR 2000
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