10-28
Bridging—Transmitting Non-IP Traffic or Merging Two Networks
Troubleshooting Spanning Tree
Figure 10-7. Viewing Real-Time Spanning Tree
Slow Convergence
The best way to solve slow convergence is to update all network devices from
STP to RSTP.
When a router running RSTP connects to an STP device, it automatically runs
STP on that interface. If you have recently updated network devices to RSTP,
you may need to force connecting router interfaces to stop running STP. Use
this enable mode command:
Syntax: clear spanning-tree detected-protocol [interface ethernet <slot>/<port>]
You can force the entire router to return to RSTP by simply entering clear
spanning-tree detected-protocol. Or you can force the single interface that
connects to the updated device. For example:
ProCurve# clear spanning-tree detected-protocol interface eth 0/1
--------------------------------------------------------------------
STP 0
Bridge Group 1
Spanning Tree enabled protocol ieee 802.1w (Rapid Spanning-Tree)
Root ID Priority 32768
Address 00:12:79:05:25:b0
Cost 651
Port 2 (fr 1.1)
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Bridge ID Priority 32768
Address 00:12:79:05:25:d4
Aging Time 300
Interface Role Sts Cost Prio.Nbr Type
---------------- ---- --- --------- -------- -----------------------
fr 1.1 Desg LIS 651 128.2 P2p
--------------------------------------------------------------------
Exit - 'Ctrl-C', Freeze - 'f', Resume - 'r'
Return to the command line
Stop and start the refresh
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