Cisco WS-C3560E-48PD-SF Command Reference - Page 636

spanning-tree vlan Chapter 2 Catalyst 3560 Switch 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 vlan-id forward-time seconds hello-time seconds max-age seconds priority priority root primary root secondary diameter net-diameter 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 specifies 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. 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. 2-604 Catalyst 3560 Switch Command Reference 78-16405-05