Chapter 4: Utility Commands 259
debug spanning-
tree bpdu
This command enables tracing of spanning tree BPDUs received and transmitted
by the switch.
no debug spanning-
tree bpdu
This command disables tracing of spanning tree BPDUs.
debug spanning-
tree bpdu receive
This command enables tracing of spanning tree BPDUs received by the switch.
Spanning tree should be enabled on the device and on the interface in order to
monitor packets for a particular interface.
A sample output of the trace message is shown below.
<15> JAN 01 01:02:04 192.168.17.29-1 DOT1S[191096896]:
dot1s_debug.c(1249) 101 % Pkt RX - Intf: 1/0/9(9), Source_Mac:
00:11:88:4e:c2:10 Version: 3, Root Mac: 00:11:88:4e:c2:00, Root
Priority: 0x8000 Path Cost: 0
The following parameters are displayed in the trace message:
Default disabled
Format
debug spanning-tree bpdu
Mode Privileged EXEC
Format
no debug spanning-tree bpdu
Mode Privileged EXEC
Default disabled
Format
debug spanning-tree bpdu receive
Mode Privileged EXEC
Parameter Definition
RX A packet received by the device.
Intf The interface that the packet came in on. Format
used is unit/port/slot (internal interface number).
Unit is always shown as 1 for interfaces on a non-
stacking device.
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