KB.15.15

Example 104 Switch ceasing to send BPDUs

With switch 1 ceasing to send BPDUs through port 20 to switch 2, port 20 goes into the

“inconsistent” state and ceases to forward traffic, as displayed in the following show

spanning-tree output for VLAN 20.

HP Switch(config)#: show spanning-tree vlan 20

Spanning Tree Information

STP Enabled [No] : Yes

Mode : RPVST

Extended System ID : Enabled

Ignore PVID Inconsistency : Disabled

Switch MAC Address : 002347-c651c0

VLAN ID : 20

RPVST Enabled : Enabled

Root MAC Address : 0024a8-d13a40

Root Priority : 32,768

Root Path Cost : 20,000

Root Port : 1

Operational Hello Time (secs) : 2

Topology Change Count : 3

Time Since Last Change : 42 hours

Designated

Port Type Cost Priority Role State Bridge

----- ---------- ------ --------- ---------- ---------- ---------------

1 100/1000T 20000 128 Root Forwarding 0024a8-d13a40

20 10/100TX 200000 128 Alternate Inconsi... 002347-587b80

142 Rapid per-VLAN spanning tree (RPVST+) operation