Cisco Catalyst 2960-X Command Reference Manual page 120
Layer 2
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Also See for Catalyst 2960-X:
- Security configuration manual (498 pages) ,
- Hardware installation manual (34 pages) ,
- Getting started manual (25 pages)
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spanning-tree vlan
Command History
Release
Cisco IOS 15.0(2)EX
Usage Guidelines
If the switch does not hear BPDUs within the time specified by the max-age seconds- value, it recomputes
the spanning-tree topology.
Use the spanning-tree vlan vlan-id root only on backbone switches.
The spanning-tree vlan vlan-id root secondary command alters this switch's priority from 32768 to 28672.
If the root switch should fail, this switch becomes the next root switch.
We do not recommend disabling spanning tree, even in a topology that is free of physical loops. Spanning
Caution
tree is a safeguard against misconfigurations and cabling errors. Do not disable spanning tree in a VLAN
without ensuring that there are no physical loops present in the VLAN.
Examples
The following example shows how to enable spanning tree on VLAN 200:
Switch(config)# spanning-tree vlan 200
The following example shows how to configure the switch as the root switch for VLAN 10 with a network
diameter of 4:
Switch(config)# spanning-tree vlan 10 root primary diameter 4
The following example shows how to configure the switch as the secondary root switch for VLAN 10 with
a network diameter of 4:
Switch(config)# spanning-tree vlan 10 root secondary diameter 4
Related Commands
Command
show spanning-tree
Catalyst 2960-X Switch Layer 2 Command Reference, Cisco IOS Release 15.0(2)EX
114
Modification
This command was introduced.
Description
Displays spanning-tree information.
Layer 2 Commands
OL-29043 -01
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