260 Serviceability Packet Tracing Commands
no debug spanning-
tree bpdu receive
This command disables tracing of received spanning tree BPDUs.
debug spanning-
tree bpdu transmit
This command enables tracing of spanning tree BPDUs transmitted by the
switch. Spanning tree should be enabled on the device and on the interface in
order to monitor packets on 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 TX - Intf: 1/0/7(7), Source_Mac:
00:11:88:4e:c2:00 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:
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.
Parameter Definition
Format
no debug spanning-tree bpdu receive
Mode Privileged EXEC
Default disabled
Format
debug spanning-tree bpdu transmit
Mode Privileged EXEC
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