A10E/A28E/A28F Configuration Guide
Alpha-A28E(config-region)#name
name
Configure MST domain name.
Alpha-A28E(config-
region)#revision-level
level-
value
Set revision level for MST domain.
Alpha-A28E(config-
region)#instance
instance-id
vlan
vlan-list
Alpha-A28E(config-region)#exit
Set mapping relationship from MST
domain VLAN to instance.
Alpha-A28E(config)#spanning-
tree max-hops
hops-value
Configure the maximum hop count for
MST domain.
The maximum hop count is MST domain maximum hop count if and only if the
configured device is root of the domain; other roots cannot configure this item
effectively.
7.5.6 Configuring root bridge/backup bridge
Two methods for MSTP root selection: one is to configure device priority and calculated by
STP to confirm the STP root bridge or backup bridge; the other is to assign MSTP root
directly by this command. When the root bridge has fault or power off, the backup bridge can
take the place of the root bridge for related instance. In this cast, if user has set new root
bridge, the backup bridge will not become the root bridge. If user has configured several
backup bridges for a spanning tree, once the root bridge stops working, MSTP will choose the
backup root with the smallest MAC address as new root bridge.
It is recommended that you not modify the priority of any device in the network if
adopting direct assigning root bridge method, otherwise, the assigned root bridge or
backup bridge may be invalid.
Configure root bridge or backup bridge for the A10E/A28E as below.
Enter global configuration mode.
Alpha-A28E(config)#spanning-tree
[ instance
instance-id
] root
{ primary | secondary }
Set the A10E/A28E as root bridge
or backup bridge for a STP
instance.
You can confirm the effective instance of the root bridge or backup bridge through
the parameter instance instance-id. The current device will be assigned as the
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