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Utility Commands
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ProSafe M4100 and M7100 Managed Switches
debug spanning-tree bpdu
This command enables tracing of spanning tree BPDUs received and transmitted by the
switch.
Default
Format debug spanning-tree bpdu
Mode
no debug spanning-tree bpdu
This command disables tracing of spanning tree BPDUs.
Format no debug spanning-tree bpdu
Mode
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
Format debug spanning-tree bpdu receive
Mode
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: 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:
RX
Intf
Source_Mac
Version
Root_Mac
Root_Priority
Path_Cost
disabled
Privileged EXEC
Privileged EXEC
disabled
Privileged EXEC
Parameter Definition
A packet received by the device.
The interface that the packet came in on. Format used is slot/port (internal interface
number). Unit is always shown as 1 for interfaces on a non-stacking device.
Source MAC address of the packet.
Spanning tree protocol version (0-3). 0 refers to STP, 2 RSTP and 3 MSTP.
MAC address of the CIST root bridge.
Priority of the CIST root bridge. The value is between 0 and 61440. It is displayed in hex
in multiples of 4096.
External root path cost component of the BPDU.