Cisco Catalyst 2950

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Catalyst 2950 and Catalyst 2955 Switch Command Reference
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Chapter 2 Catalyst 2950 and 2955 Cisco IOS Commands
show spanning-tree
Related Commands Command Description
clear spanning-tree counters Clears the spanning-tree counters.
clear spanning-tree detected-protocols Restarts the protocol migration process.
spanning-tree backbonefast Enables the BackboneFast feature.
spanning-tree bpdufilter Prevents a port from sending or receiving bridge protocol
data units (BPDUs).
spanning-tree bpduguard Puts a port in the error-disabled state when it receives a
BPDU.
spanning-tree cost Sets the path cost for spanning-tree calculations.
spanning-tree extend system-id Enables the extended system ID feature.
spanning-tree guard Enables the root guard or the loop guard feature for all the
VLANs associated with the selected interface.
spanning-tree link-type Overrides the default link-type setting for rapid
spanning-tree transitions to the forwarding state.
spanning-tree loopguard default Prevents alternate or root ports from becoming the
designated port because of a failure that leads to a
unidirectional link.
spanning-tree mst configuration Enters multiple spanning-tree (MST) configuration mode
through which the MST region configuration occurs.
spanning-tree mst cost Sets the path cost for MST calculations.
spanning-tree mst forward-time Sets the forward-delay time for all MST instances.
spanning-tree mst hello-time Sets the interval between hello BPDUs sent by root switch
configuration messages.
spanning-tree mst max-age Sets the interval between messages that the spanning tree
receives from the root switch.
spanning-tree mst max-hops Sets the number of hops in an MST region before the
BPDU is discarded and the information held for a port is
aged.
spanning-tree mst port-priority Configures an interface priority.
spanning-tree mst priority Configures the switch priority for the specified
spanning-tree instance.
spanning-tree mst root Configures the MST root switch priority and timers based
on the network diameter.
spanning-tree port-priority Configures an interface priority.
spanning-tree portfast (global
configuration)
Globally enables the BPDU filtering or the BPDU guard
feature on Port Fast-enabled ports or enables the Port Fast
feature on all nontrunking ports.
spanning-tree portfast (interface
configuration)
Enables the Port Fast feature on an interface and all its
associated VLANs.
spanning-tree uplinkfast Accelerates the choice of a new root port when a link or
switch fails or when the spanning tree reconfigures itself.
spanning-tree vlan Configures spanning tree on a per-VLAN basis.