Cisco Systems EA6500 Manual De Usuario

To configure a Catalyst 6500 series switch as the secondary root bridge, perform this task: 

This example shows how to configure the Catalyst 6500 series switch as the secondary root bridge for 
VLAN 10, with a network diameter of 4:

Router# configure terminal 

Router(config)# spanning-tree vlan 10 root secondary diameter 4 

Router(config)# end 

Router#

If a loop occurs, STP considers port priority when selecting a LAN port to put into the forwarding state. 
You can assign higher priority values to LAN ports that you want STP to select first and lower priority 
values to LAN ports that you want STP to select last. If all LAN ports have the same priority value, STP 
puts the LAN port with the lowest LAN port number in the forwarding state and blocks other LAN ports. 
The possible priority range is 0 through 240 (default 128), configurable in increments of 16. 

Cisco IOS uses the port priority value when the LAN port is configured as an access port and uses VLAN 
port priority values when the LAN port is configured as a trunk port. 

To configure the STP port priority of a Layer 2 LAN interface, perform this task: 

Router(config)# [no] spanning-tree vlan vlan_ID 

 [diameter hops [hello-time 

seconds]] 

Configures a Catalyst  6500 series switch as the secondary 
root bridge. The vlan_ID value can be 1 through 4094, 
except reserved VLANs (see 

Router(config)# no spanning-tree vlan vlan_ID 

 

Clears the root bridge configuring.

Router(config)# end 

Exits configuration mode.

Router(config)# interface {{type

1

 slot/port} | 

{port-channel port_channel_number}}

Selects an interface to configure. 

Router(config-if)# spanning-tree port-priority 

port_priority 

Configures the port priority for the LAN interface. The 
port_priority value can be from 1 to 252 in increments 
of 4. 

Router(config-if)# no spanning-tree port-priority 

Reverts to the default port priority value.

Router(config-if)# spanning-tree vlan vlan_ID 

 port_priority 

Configures the VLAN port priority for the LAN interface. 
The port_priority value can be from 1 to 252 in 
increments of 4. The vlan_ID value can be 1 through 
4094, except reserved VLANs (see 

Router(config-if)# [no] spanning-tree vlan 

vlan_ID port-priority 

Reverts to the default VLAN port priority value.

Router(config-if)# end 

Exits configuration mode.