3Com Switch 4800G 24-Port Configuration Manual page 223

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Enabling the Output of
Port State Transition
Information
Configuration procedure
Follow these steps to configure the MSTP packet format to be supported by a port
or a group of ports:
To do...
Enter system view
Enter Enter
Ethernet Ethernet
interface interface
view or view
port group
Enter port
view
group view
Configure the mode the
port uses to
recognize/send MSTP
packets
In MSTP mode, if a port is configured to recognize/send MSTP packets in a
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mode other than auto, and if it receives a packet in the format different from
the specified type, that port will become a designated port and remain in the
discarding state to prevent the occurrence of a loop.
If a port receives MSTP packets of different formats frequently, this means that
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the MSTP packet formation configuration contains error. In this case, if the port
is working in MSTP mode, it will be disabled for protection. Those ports closed
thereby can be restored only by the network administers.
Configuration example
# Configure GigabitEthernet 1/0/1 to receive and send standard-format MSTP
packets.
<Sysname> system-view
[Sysname] interface GigabitEthernet 1/0/1
[Sysname-GigabitEthernet1/0/1] stp compliance dot1s
In a large-scale, MSTP-enabled network, there are a large number of MSTP
instances, so ports may frequently transition from one state to another. In this
situation, you can enable the device to output the port state transition information
of all SPT instances or the specified SPT instance so as to monitor the port states in
real time.
Follow these steps to enable output of port state transition information:
To do...
Enter system view
Enable output of port state
transition information of all
instances or a particular instance
Use the command...
system-view
interface interface-type
interface-number
port-group { manual
port-group-name | aggregation
agg-id }
stp compliance { auto | dot1s |
legacy }
Use the command...
system-view
stp port-log { all | instance
instance-id }
Configuring the Root Bridge
Remarks
-
Required
Use either command.
Configurations made in
Ethernet interface view will take
effect on the current port only;
configurations made in port
group view will take effect on
all ports in the port group.
Optional
auto by default
Remarks
-
Optional
Enabled by default
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