Managed Switch CLI Manual, Release 8.0.3
Utility Commands 9-81
v1.0, July 2010
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:
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.
Source_Mac Source MAC address of the packet.
Version Spanning tree protocol version (0-3). 0 refers to STP, 2 RSTP and 3 MSTP.
Root_Mac MAC address of the CIST root bridge.
Root_Priority Priority of the CIST root bridge. The value is between 0 and 61440. It is displayed in hex in
multiples of 4096.
Path_Cost External root path cost component of the BPDU.
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