VPLS Service Configuration Commands
Page 488 7750 SR OS Services Guide
Description This command creates the context to configure MST instance (MSTI) related parameters. Up to 16
instances will be supported by MSTP. The instance 0 is mandatory by protocol and therefore, it
cannot be created by the CLI. The software will maintain this instance automatically.
Default none
Parameters mst-inst-number — Specifies the Multiple Spanning Tree instance.
Values 1 — 4094
mst-priority
Syntax mst-priority bridge-priority
no mst-priority
Context config>service>vpls>stp>mst-instance
Description This command specifies the bridge priority for this specific Multiple Spanning Tree Instance for this
service. The bridge-priority value reflects likelihood that the switch will be chosen as the regional
root switch (65535 represents the least likely). It is used as the highest 4 bits of the Bridge ID
included in the MSTP BPDU's generated by this bridge.
The priority can only take on values that are multiples of 4096 (4k). If a value is specified that is not a
multiple of 4K, then the value will be replaced by the closest multiple of 4K, which is lower than the
value entered.
The no form of this command sets the bridge-priority to its default value.
Default 32768 — All instances created by vlan-range command and not having explicit definition of bridge-
priority will inherit default value.
Parameters bridge-priority — Specifies the priority of this specific Multiple Spanning Tree Instance for this
service.
Values 0 — 65535
vlan-range
Syntax [no] vlan-range [vlan-range]
Context config>service>vpls>stp>mst-instance
Description This command specifies a range of VLANs associated with a certain MST-instance. This range
applies to all SAPs of the mVPLS.
Every VLAN range that is not assigned within any of the created mst-instance is automatically
assigned to mst-instance 0. This instance is automatically maintained by the software and cannot be
modified. Changing the VLAN range value can be performed only when the given mst-instance is
shutdown.
The no form of this command removes the vlan-range from given mst-instance.
Parameters vlan-range — The first VLAN range specifies the left-bound (i.e., minimum value) of a range of
VLANs that are associated with the mVPLS SAP. This value must be smaller than (or equal to)
the second VLAN range value.
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