11.4 Spanning Tree Configuration

Question 1

Switch(config)#spanning-tree mode {pvst|rapid-pvst|mst}

Answer 1

Sets the spanning tree mode.

Question 2

Switch(config)#spanning-tree vlan [1-4094] root primary

Answer 2

Forces the switch to be the root of the spanning tree.

Question 3

Switch(config)#spanning-tree vlan [1-4094] cost [1 - 200000000]

Answer 3

Sets the cost manually. The cost range value depends on the path-cost calculation method:

Question 4

Switch(config)#spanning-tree vlan [1-4094] priority [0-61440]

Answer 4

Sets the bridge priority number manually:

Question 5

Switch(config-if)#spanning-tree portfast

Answer 5

Enables PortFast on the interface. When the PortFast feature is enabled, the interface changes directly from a blocking state to a forwarding state without making the intermediate spanning-tree state changes.

Question 6

Switch(config)#spanning-tree uplinkfast

Answer 6

Enables UplinkFast to accelerate the choice of a new root port when a link or switch fails or when the spanning tree reconfigures itself.

Question 7

Switch(config)#no spanning-tree vlan [1-4094]

Answer 7

Disables spanning tree on the selected VLAN

Question 8

Switch#show spanning-tree

Answer 8

Shows spanning tree configuration information

Question 9

Switch#show spanning-tree vlan [1-4094] root

Answer 9

Shows information about the root bridge for a specific VLAN.

Question 10

Switch#show spanning-tree vlan [1-4094] root

Answer 10

Shows information about the root bridge for a specific VLAN. Information shown

Question 11

Switch#show spanning-tree vlan [1-4094] bridge

Answer 11

Shows spanning tree configuration information about the local switch for the specified VLAN. Information includes the local bridge ID, including the priority and MAC address.