Spanning-Tree Vlan - Cisco Catalyst 3750 Metro Command Reference Manual
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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.
Syntax Description
vlan-id
forward-time seconds
hello-time seconds
max-age seconds
priority priority
root primary
root secondary
diameter net-diameter
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.
Catalyst 3750 Metro Switch Command Reference
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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]
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.
(Optional) Set the forward-delay time for the specified spanning-tree
instance. The forwarding time controls how long each of the listening and
learning states last before the interface begins forwarding. The range is 4 to
30 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.
(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.
(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.
(Optional) Force this switch to be the root switch.
(Optional) Set this switch to be the root switch should the primary root
switch fail.
(Optional) Set the maximum number of switches between any two end
stations. The range is 2 to 7.
Chapter 2 Catalyst 3750 Metro Switch Cisco IOS Commands
OL-9645-10
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