H3C Technologies H3C S12500 Series Switches - Manual (Page 10)

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BCB
Backbone core bridges (BCBs) are core nodes of an SPBM network. They are identical to the P devices
in an MPLS VPN network. BCBs forward MAC-in-MAC frames based on the B-MAC and B-VLAN. They
do not learn customer MAC (C-MAC) addresses.
BEB
Backbone edge bridges (BEBs) are edge nodes of the SPBM network. They are identical to PEs in an
MPLS VPN network. BEBs encapsulate customer frames into MAC-in-MAC frames before forwarding
them to the SPBM network. BEBs also decapsulate MAC-in-MAC frames before sending them to a
customer site.
B-MAC, B-VLAN
Backbone MAC addresses (B-MACs) are bridge MAC addresses associated with SPBM bridges.
Backbone VLANs (B-VLANs) are VLANs assigned by the service provider for transmitting customer traffic
on the SPBM network.
For customer frames to be transmitted across an SPBM network, the ingress BEB encapsulates them in
MAC-in-MAC format. In the outer frame header, the source MAC address is a B-MAC of the ingress BEB,
and the destination MAC is a B-MAC of the egress BEB. All devices in the SPBM network forward the
MAC-in-MAC frames based on the destination B-MAC and B-VLAN.
Customer network port, provider network port
On a BEB, a customer network port (CNP) connects to a customer site and a provider network port (PNP)
connects to the SPBM network.
Ethernet service instance
An Ethernet service instance provides forwarding service for a set of C-VLANs. To extend C-VLANs across
customer sites over an SPBM network, you must configure Ethernet service instances on BEBs' customer
edge ports and map them to SPB VSIs.
For more information about Ethernet service instances, see VPLS in MPLS Configuration Guide.
I-SID
A backbone services instance identifier (I-SID) uniquely identifies a MAC-in-MAC service instance (also
called an "SPB VSI") provided by the service provider.
ISIS-SPB
ISIS-SPB is the control protocol for an SPBM network to calculate shortest path trees (SPTs) and maintain
adjacencies between neighbors.