User's Manual

Figure 64 Monitoring RSTP
Troubleshooting RSTP
The following points give some troubleshooting tips.
l The show spantree command displays the root and the bridge information; verify that they are correct.
Also displayed is the port/interface information (for example, state, role, and so on); make sure that the
state and role information correspond to each other.
(host) (config) #show spantree
Designated Root MAC 00:0b:86:50:3c:20
Designated Root Priority 32768
Root Max Age 20 sec Hello Time 2 sec Forward Delay 15 sec
Bridge MAC 00:0b:86:50:3c:20
Bridge Priority 32768
Configured Max Age 20 sec Hello Time 2 sec Forward Delay 15 sec
Rapid Spanning-Tree port configuration
--------------------------------
Port State Cost Prio PortFast P-to-P Role
---- ----- ---- ---- -------- ------ ----
FE 1/0 Discarding 0 128 Disable Enable Disabled
FE 1/1 Forwarding 0 128 Disable Enable Designated
FE 1/2 Forwarding 0 128 Disable Enable Root
FE 1/3 Discarding 0 128 Disable Disable Disabled
FE 1/4 Discarding 0 128 Disable Enable Alternate
l The show spanning-tree interface command (config-if mode) displays Tx/Rx BPDU counters. Validate
those values. For example, if a port’s role is “designated,” it only transmit BPDUs and does not receive any.
Dell Networking W-Series ArubaOS 6.4.x | User Guide RSTP | 591