HP 3500 Series

3-62
Multiple Instance Spanning-Tree Operation
Troubleshooting an MSTP Configuration
Figure 3-27. Example of show spanning-tree root-history cst Command Output
Figure 3-28. Example of show spanning-tree root-history ist Command Output
Figure 3-29. Example of show spanning-tree root-history msti Command Output
HP Switch(config)# show spanning-tree root-history cst
Status and Counters - CST Root Changes History
MST Instance ID : 0
Root Changes Counter : 2
Current Root Bridge ID : 32768:000883-024500
Root Bridge ID Date Time
------------------- -------- --------
32768:000883-024500 02/09/07 17:40:59
36864:001279-886300 02/09/07 17:40:22
Identifies the root bridge of the common
spanning tree in a bridged network that
connects different MST regions and STP
or RSTP devices.
HP Switch(config)# show spanning-tree root-history ist
Status and Counters - IST Regional Root Changes History
MST Instance ID : 0
Root Changes Counter : 2
Current Root Bridge ID : 32768:000883-024500
Root Bridge ID Date Time
------------------- -------- --------
32768:000883-024500 02/09/07 17:40:59
36864:001279-886300 02/09/07 17:40:22
Identifies the root bridge of the internal
spanning tree in an MST region.
HP Switch(config)# show spanning-tree root-history mst 2
Status and Counters - MST Instance Regional Root Changes History
MST Instance ID : 2
Root Changes Counter : 2
Current Root Bridge ID : 32770:000883-024500
Root Bridge ID Date Time
------------------- -------- --------
32770:000883-024500 02/09/07 17:40:59
32770:001279-886300 02/09/07 17:40:22
Identifies the root bridge of an MST
instance in an MST region.