Slow Convergence - HP ProCurve 7000dl Series Basic Management And Configuration Manual

Bridging—Transmitting Non-IP Traffic or Merging Two Networks
Troubleshooting Spanning Tree
10-28
--------------------------------------------------------------------
STP 0
Bridge Group 1
Spanning Tree enabled protocol ieee 802.1w (Rapid Spanning-Tree)
Root ID Priority
Address
Cost
Port
Hello Time
Bridge ID Priority
Address
Aging Time
Interface Role Sts Cost
---------------- ---- --- --------- -------- -----------------------
fr 1.1 Desg LIS 651
--------------------------------------------------------------------
Exit - 'Ctrl-C', Freeze - 'f', Resume - 'r'
Return to the command line
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
32768
00:12:79:05:25:b0
651
2 (fr 1.1)
2 sec Max Age 20 sec
32768
00:12:79:05:25:d4
300
Prio.Nbr Type
128.2 P2p
Stop and start the refresh
Forward Delay 15 sec