2-802
Catalyst 3750 Switch Command Reference
OL-8552-07
Chapter 2 Catalyst 3750 Switch Cisco IOS Commands
spanning-tree vlan
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 a standalone switch or a switch in the
stack 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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