Configuring Root/Backup Bridge - Raisecom ISCOM2600G-HI (A) Series Configuration Manual

Raisecom
ISCOM2600G-HI (A) Series Configuration Guide
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
1
2
3
4
5
6
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:


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.
Command
Raisecom#config
Raisecom(config)#spanning-tree
region-configuration
Raisecom(config-region)#name
name
Raisecom(config-
region)#revision-level
value
Raisecom(config-
region)#instance
vlan-list
vlan
Raisecom(config-region)#exit
Raisecom(config)#spanning-tree
max-hops hops-value
To configure device priority and calculated by STP to confirm STP root bridge or backup
bridge
To assign MSTP root directly by a command
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Enter global configuration mode.
Enter MST region configuration mode.
Configure the MST region name.
Configure the revision level for the
level-
MST region.
Configure mapping from MST region
instance-id
VLAN to instance.
Configure the maximum number of
hops for MST region.
2 Ethernet
Description
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