Configuring A Secondary Root Switch - Cisco NCS 4200 Series Configuration Manual
Lan switching
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Also See for NCS 4200 Series:
- Configuration manual (87 pages) ,
- Configuration manuals (30 pages) ,
- Configuration manual (36 pages)
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Configuring a Secondary Root Switch
SUMMARY STEPS
1. configure terminal
2. spanning-tree vlan vlan-id root primary [diameter net-diameter [hello-time seconds ]]
3. end
4. show spanning-tree detail
5. copy running-config startup-config
DETAILED STEPS
Command or Action
Step 1
configure terminal
Step 2
spanning-tree vlan vlan-id root
primary [diameter net-diameter
[hello-time seconds ]]
Step 3
end
Step 4
show spanning-tree detail
Step 5
copy running-config startup-config
To return to the default setting, use the no spanning-tree vlan vlan-id root global configuration command.
Configuring a Secondary Root Switch
When you configure a switch as the secondary root, the switch priority is modified from the default value
(32768) to 28672. The switch is then likely to become the root switch for the specified VLAN if the primary
root switch fails. This is assuming that the other network switches use the default switch priority of 32768
and therefore are unlikely to become the root switch.
You can execute this command on more than one switch to configure multiple backup root switches. Use the
same network diameter and hello-time values that you used when you configured the primary root switch
with the spanning-tree vlan vlan-id root primary global configuration command .
Beginning in privileged EXEC mode, follow these steps to configure a switch to become the secondary root
for the specified VLAN. This procedure is optional.
LAN Switching Configuration Guide, Cisco IOS XE Everest 16.6.1 (Cisco NCS 4200 Series)
52
Purpose
Enter global configuration mode.
Configure a switch to become the root for the specified VLAN.
• For vlan-id , you can specify a single VLAN identified by VLAN ID
number, a range of VLANs separated by a hyphen, or a series of
VLANs separated by a comma. The range is 1 to 4094.
• (Optional) For diameter net-diameter , specify the maximum number
of switches between any two end stations. The range is 2 to 7.
• (Optional) For hello-time seconds , specify the interval in seconds
between the generation of configuration messages by the root switch.
The range is 1 to 10; the default is 2.
Return to privileged EXEC mode.
Verify your entries.
(Optional) Save your entries in the configuration file.
Configuring PVST+ and RPVST+
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