FUJITSU PSWITCH User’s Guide
84 December/2018
B-domain interface that faces the backbone network. It also disables both MAC
learning and Spanning Tree Protocol. For users to enable this feature, SPBM must
be disabled.
This equipment can not operate as a BCB in the traffic engineering network. Only
point-to-point BEB connection is supported.
3.1.2.16. Shortest Path Bridging MAC (IEEE 802.1aq)
The shortest path bridging MAC (SPBM) allows multiple shortest path transfers in
mesh Ethernet network context using multiple equal cost paths. It is designed to
replace STP in the backbone network. SPBM does not put the port in the discard
state, it uses all available ports and uses the same filtering database as the Layer 3
protocol update routing table.
The SPBM needs to be deployed in the provider backbone bridge network. The
results calculated by IS-IS apply to B-VLAN filtering database. Broadcast, unknown
unicast and multicast are not allowed on this network. In order to enable this
function, PBB-TE must be disabled.
Since multicasting within the SPBM network is not supported, the SPBM network
can not have more than two BEBs that use the same I-SID.
3.1.2.16.1. IS-IS (Intermediate System to Intermediate System)
Intermediate System to Intermediate System (IS-IS) is a link-state routing protocol
used for SPB. IS-IS has been extended to carry the necessary Ethernet address,
VLAN, and service membership information introduced by the SPB.
When used for SPB, there is no IP dependency on IS-IS. IS-IS also supports
multi-topology (MT) and logical instances for easy virtualization of link-state
protocols.
3.1.2.16.2. SPB extension
The IS-IS extended for SPB is called ISIS-SPB. SPB extensions are additional to IS-IS
and do not preclude other IS-IS protocols that are used at the same time. ISIS-SPB
supports only point-to-point links.
ISIS-SPB updates the link-state database using the regular IS-IS procedure. IS-IS
communicates between ISIS-SPB switches using SPB Hello PDUs and link state
PDUs (LSPs).
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