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Catalyst 2950 and Catalyst 2955 Switch Command Reference

0L-10102-02

Chapter 2 Catalyst 2950 and 2955 Cisco IOS Commands

spanning-tree vlan

Command History

Usage Guidelines Disabling the STP causes the VLAN to stop participating in the spanning-tree topology. Interfaces that

are administratively down remain down. Received BPDUs are forwarded like other multicast frames.

The switch does not detect and prevent loops in a VLAN if STP is disabled for that VLAN.

You can disable the STP on a VLAN that is not currently active and verify the change by using the show

running-config or the show spanning-tree vlan vlan-id privileged EXEC command. The setting takes

effect when the VLAN is activated.

When disabling or re-enabling the STP, you can specify a range of VLANs that you want to disable or

enable.

When the STP is disabled and then enabled, all assigned VLANs continue to be its members. However,

all spanning-tree bridge parameters are returned to their previous settings (the last setting before the

VLAN was disabled).

You can enable spanning-tree options on a VLAN that has no interfaces assigned to it. The setting takes

effect when you assign interfaces to it.

When setting the max-age seconds, if a switch does not receive BPDUs from the root switch within the

specified interval, it recomputes the spanning-tree topology. The max-age setting must be greater than

the hello-time setting.

The spanning-tree vlan vlan-id root command should be used only on backbone switches.

When you enter the spanning-tree vlan vlan-id root command, the software checks the switch priority

of the current root switch for each VLAN. Because of the extended system ID support, the switch sets

the switch priority for the specified VLAN to 24576 if this value will cause this switch to become the

root for the specified VLAN. If any root switch for the specified VLAN has a switch priority lower than

24576, the switch sets its own priority for the specified VLAN to

4096 less than the lowest switch

priority. (4096 is the value of the least-significant bit of a 4-bit switch priority value.)

When you enter the spanning-tree vlan vlan-id root primary command, the switch recalculates the

forward-time, hello-time, max-age, and priority settings. If you previously configured these

parameters, the switch overrides and recalculates them.

When you enter the spanning-tree vlan vlan-id root secondary command, because of support for the

extended system ID, the software changes the switch priority from the default value (32768) to 28672.

If the root switch should fail, this switch becomes the next root switch (if the other switches in the

network use the default switch priority of

32768, and therefore, are unlikely to become the root switch).

Examples This example shows how to disable the STP on VLAN 5:

Switch(config)# no spanning-tree vlan 5

You can verify your setting by entering the show spanning-tree privileged EXEC command. In this

instance, VLAN 5 does not appear in the list.

This example shows how to set the spanning-tree forwarding time to 18 seconds for VLANs 20 and 25:

Switch(config)# spanning-tree vlan 20,25 forward-time 18

Release Modification

12.0(5.2)WC(1) This command was introduced.

12.1(9)EA1 The priority priority range changed from 1 to 65535 to 1 to 61440 (in

increments of 4096).

1 2 ... 496 497 498 499 500 501 502 503 504 505 506 ... 673 674

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