Commands

Modules: | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | All |

Module 3: Spanning-Tree Protocol

3.6.2

Enabling and disabling Spanning-Tree Protocol

> Switch(config)#spanning-tree vlan vlan-id

3.6.3

Modifying the root bridge

> Pre 12.1(9)EA1
> Switch(config)#spanning-tree vlan vlan-id root
> 12.1(9)EA1 +
> Switch(config)#spanning-tree vlan vlan-id root primary

3.6.4

Setting the priority for ports and VLANs

> Switch#show spanning-tree interface

3.6.5

Setting the port cost

> Switch#show spanning-tree interface

3.6.7

Modifying default timers

> Switch(config)#show spanning-tree interface spanning-tree vlan vlan-id hello-time
> Switch(config)#spanning-tree vlan vlan-id forward-time
> Switch(config)#Spanning-tree vlan vlan-id max-age

3.7.1

Configuring PortFast

> Switch(config)#spanning-tree portfast default
> Switch(config-if)#spanning-tree portfast disable

3.7.2

Configuring UplinkFast

> Switch(config)#no spanning-tree vlan vlan-id priority
> Switch(config)#no spanning-tree uplinkfast max-update-rate
> Switch(config)#no spanning-tree uplinkfast

3.7.3

Configuring BackboneFast

> Switch(config)#no spanning-tree backbonefast

3.7.4

Configuring BPDU guard

> Switch(config-if)#spanning-tree bpduguard enable
> Switch(config)#no spanning-tree portfast bpduguard default

3.7.5

Configuring root guard

> Switch(config)#no spanning-tree guard

3.7.7

Verifying STP, RSTP and MST configuration

> Switch#show spanning-tree

3.8.3

Enabling RSTP and MSTP

> Switch(config-mst)#no instance instance-id [vlan vlan-range]
> Switch(config)#no spanning-tree mode
> Switch(config)#spanning-tree mode pvst
> Switch(config)#spanning-tree mst configuration
> Switch(config-mst)#name mst-instance-name
> Switch(config-mst)#revision number
> Switch(config-mst)#show pending

3.8.4

Configuring the MST Root switch

> Switch(config)#spanning-tree mst instance-id root

3.8.7

Configuring MST port priority

> Switch#show spanning-tree mst interface interface-id
> Switch#show running-config interface
> Switch(config-if)#no spanning-tree mst instance-id port-priority

3.8.6

Configuring MST path cost

> Switch#show spanning-tree mst interface Switch#show running-config Switch(config-if)#no spanning-tree mst instance-id cost

3.8.8

Configuring MSTP timers

> Note: Exercise care when using this command. For most situations, we recommend that you use the spanning-tree mst instance-id root primary and the spanning-tree mst instance-id root secondary global configuration commands to modify the hello time.

> Switch(config)#no spanning-tree mst hello-time
> Switch(config)#no spanning-tree mst forward-time
> Switch(config)#no spanning-tree mst max-age

3.8.9

Configuring Maximum hop count

> Switch(config)#no spanning-tree mst max-hops

3.9.8

Configuring Fast EtherChannel

> Switch(config-if)#channel-group channel-group-number mode{auto [non-silent] | desirable [non-silent] | on}
> Switch(config-if)#no channel-group.
> Switch#show etherchannel [channel-group-number] {brief | detail | load-balance| port | port-channel | summary}
> Switch(config-if)#port-channel load-balance {dst-mac | src-mac},
> Switch(config)#show etherchannel load-balance
> Switch(config)#show pagp [channel-group-number] {counters | internal | neighbor}

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