Design Reference

Glossary
Backbone Core
Bridge (BCB)
Backbone Core Bridges (BCBs) form the core of the SPBM network. The
BCBs are SPBM nodes that do not terminate the VSN services. BCBs
forward encapsulated VSN traffic based on the Backbone MAC Destination
Address (B-MAC-DA). A BCB can access information to send that traffic to
any Backbone Edge Bridges (BEBs) in the SPBM backbone.
Backbone Edge
Bridge (BEB)
Backbone Edge Bridges (BEBs) are SPBM nodes where Virtual Services
Networks (VSNs) terminate. BEBs handle the boundary between the core
MAC-in-MAC Shortest Bath Bridging MAC (SPBM) domain and the edge
customer 802.1Q domain. A BEB node performs 802.1ah MAC-in-MAC
encapsulation and decapsulation for the Virtual Services Network (VSN).
Backbone MAC (B-
MAC)
Provider Backbone Bridging (PBB) MAC-in-MAC encapsulation
encapsulates customer MAC addresses in Backbone MAC (B-MAC)
addresses. MAC-in-MAC encapsulation defines a BMAC-DA and BMAC-SA
to identify the backbone source and destination addresses. The originating
node creates a MAC header that SPBM uses for delivery from end to end.
As the MAC header stays the same across the network, no need exists to
swap a label or perform a route lookup at each node, allowing the frame to
follow the most efficient forwarding path end to end. In Shortest Path
Bridging MAC (SPBM), each node has a System ID, which is used in the
topology announcement. This same System ID also serves as the switch
Backbone MAC address (B-MAC), which is used as the source and
destination MAC address in the SPBM network.
Backbone VLAN
identifier (B-VID)
The Backbone VLAN identifier (B-VID) indicates the Shortest Path Bridging
MAC (SPBM) B-VLAN associated with the SPBM instance.
bit error rate (BER) The ratio of the number of bit errors to the total number of bits transmitted
in a specific time interval.
coarse wavelength
division multiplexing
(CWDM)
A technology that uses multiple optical signals with different wavelengths to
simultaneously transmit in the same direction over one fiber, and then
separates by wavelength at the distant end.
Connectivity Fault
Management (CFM)
Connectivity Fault Management is a mechanism to debug connectivity
issues and to isolate faults within the Shortest Path Bridging MAC (SPBM)
network. CFM operates at Layer 2 and provides the equivalent of ping and
traceroute. IEEE 802.1ag Connectivity Fault Management (CFM) divides or
December 2014 Network Design Reference for Avaya VSP 4000 Series 151
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