Kontron AT8904 CLI - Manual (Page 247)

AT8904M Utility Commands
Page 5 - 47 AT8904M CLI Reference Manual
5.11.3 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.
Default
disabled
Format
debug spanning-tree bpdu transmit
Mode
Privileged EXEC
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:
TX
A packet transmitted by the device.
Intf
The interface that the packet went out on. Format used is
port/slot (internal interface number).
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.
5.11.3.1 no debug spanning-tree bpdu transmit
This command disables tracing of transmitted spanning tree BPDUs.
Format
no debug spanning-tree bpdu transmit
Mode
Privileged EXEC
5.11.4 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.
Default
disabled
Format
debug spanning-tree bpdu receive
Mode
Privileged EXEC
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: