Cisco 3020 - Cisco Catalyst Blade Switch Specifications download pdf (Page 505)

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Cisco Catalyst Blade Switch for HP Command Reference

OL-8916-01

Chapter 2 Cisco Catalyst Blade Switch 3020 for HP Cisco IOS Commands

spanning-tree vlan

Use the spanning-tree vlan global configuration command to configure spanning tree on a per-VLAN

basis. Use the no form of this command to return to the default setting.

spanning-tree vlan vlan-id [forward-time seconds | hello-time seconds | max-age seconds |

priority priority | root {primary | secondary} [diameter net-diameter

[hello-time seconds]]]

no spanning-tree vlan vlan-id [forward-time | hello-time | max-age | priority | root]

Syntax Description

Defaults Spanning tree is enabled on all VLANs.

The forward-delay time is 15 seconds.

The hello time is 2 seconds.

The max-age is 20 seconds.

The primary root switch priority is 24576.

The secondary root switch priority is 28672.

vlan-id VLAN range associated with a spanning-tree instance. 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.

forward-time seconds (Optional) Set the forward-delay time for the specified spanning-tree

instance. The forwarding time specifies how long each of the listening and

learning states last before the interface begins forwarding. The range is 4 to

30 seconds.

hello-time seconds (Optional) Set the interval between hello bridge protocol data units

(BPDUs) sent by the root switch configuration messages. The range is 1 to 10

seconds.

max-age seconds (Optional) Set the interval between messages the spanning tree receives

from the root switch. If a switch does not receive a BPDU message from the

root switch within this interval, it recomputes the spanning-tree topology.

The range is 6 to 40 seconds.

priority priority (Optional) Set the switch priority for the specified spanning-tree instance.

This setting affects the likelihood that this switch is selected as the root

switch. A lower value increases the probability that the switch is selected

as the root switch.

The range is 0 to 61440 in increments of 4096. Valid priority values are

4096, 8192, 12288, 16384, 20480, 24576, 28672, 32768, 36864, 40960,

45056, 49152, 53248, 57344, and 61440. All other values are rejected.

root primary (Optional) Force this switch to be the root switch.

root secondary (Optional) Set this switch to be the root switch should the primary root

switch fail.

diameter net-diameter (Optional) Set the maximum number of switches between any two end

stations. The range is 2 to 7.

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Cisco 3020 - Cisco Catalyst Blade Switch Specifications Page 505

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