![]() ![]() Following is a sample output of the information that is printed by this command: Cat-3550-1# show spanning-tree detail This information includes information on STP timers and port states, among other information. ![]() The detail keyword prints detailed STP information on a per-VLAN basis. Number of blocked ports (segments) in the system : 4 The following output illustrates the information that is printed by this command: Cat-3550-1# show spanning-tree blockedports If you know which ports should be in a Blocking state, then you can use this command to verify that they are indeed blocking. The blockedports keyword prints blocked ports on a per-VLAN basis. Hello Time 2 sec Max Age 20 sec Forward Delay 15 secīridge ID Priority 1 (priority 0 sys-id-ext 1)īridge ID Priority 32778 (priority 32768 sys-id-ext 10) The output of this command is illustrated below: Cat-3550-1# show spanning-tree active This includes the STP timers, priority of the root bridge, active interfaces or ports, and their states. The active keyword prints information on active VLANs in the STP domain. Uplinkfast Show spanning tree uplinkfast status Root Status and configuration of the root bridge Interface Spanning Tree interface status and configuration Inconsistentports Show inconsistent ports WORD bridge group list, example 1,3-5,7,9īackbonefast Show spanning tree backbonefast statusīridge Status and configuration of this bridge The following output displays the keywords that can be used in conjunction with this command: Cat-3550-1# show spanning-tree ? We will also discuss the relevant output that is printed by this command and how to interpret this information when validating or troubleshooting Spanning Tree Protocol. In this post, we will explore the Cisco IOS show spanning-tree command, as well as the keywords that can be used in conjunction with this command. ![]() This command is also tested in the Cisco CCNA certification course. You can learn advanced spanning tree protocol in our Cisco CCNP ENCOR primer course. ![]()
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