Raisecom
ISCOM2600G-HI (A) Series Configuration Guide
2 Ethernet
Raisecom Proprietary and Confidential
Copyright © Raisecom Technology Co., Ltd.
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the configuration message whose number of hops is 0. The device exceeding the maximum
number of hops cannot join spanning tree calculation, so the MST region scale is restricted.
Configure MSTP region and its maximum number of hops for the ISCOM2600G-HI series
switch as below.
Step
Command
Description
1
Raisecom#config
Enter global configuration mode.
2
Raisecom(config)#spanning-tree
region-configuration
Enter MST region configuration mode.
3
Raisecom(config-region)#name
name
Configure the MST region name.
4
Raisecom(config-
region)#revision-level
level-
value
Configure the revision level for the
MST region.
5
Raisecom(config-
region)#instance
instance-id
vlan
vlan-list
Raisecom(config-region)#exit
Configure mapping from MST region
VLAN to instance.
6
Raisecom(config)#spanning-tree
max-hops
hops-value
Configure the maximum number of
hops for MST region.
Only when the configured device is the region root can the configured maximum
number of hops be used as the maximum number of hops for MST region; other non-
region root cannot be configured this item.
2.7.6 Configuring root/backup bridge
Two methods for MSTP root selection are as below:
To configure device priority and calculated by STP to confirm STP root bridge or backup
bridge
To assign MSTP root directly by a command
When the root bridge has a fault or is powered off, the backup bridge can replace the root
bridge of related instance. In this case, if a new root bridge is assigned, the backup bridge will
not become the root bridge. If several backup bridges for a spanning tree are configured, once
the root bridge stops working, MSTP will choose the backup root with the lowest MAC
address as the new root bridge.
We do not recommend modifying the priority of any device on the network if you
directly assign the root bridge. Otherwise, the assigned root bridge or backup bridge
may be invalid.
Configure the root bridge or backup bridge for the ISCOM2600G-HI series switch as below.