Configuring The Mode A Port Uses To Recognize/Send Mstp Packets - H3C S5500-SI Series Operation Manual

Operation Manual – MSTP
H3C S5500-SI Series Ethernet Switches

1.3.12 Configuring the Mode a Port Uses to Recognize/Send MSTP Packets

A port can send/recognize MSTP packets of two formats:
802.1s-compliant standard format, and
Compatible format
By default, the packet format recognition mode of a port is auto, namely the port
automatically distinguishes the two MSTP packet formats, and determines the format of
packets it will send based on the recognized format. You can configure the MSTP
packet format to be used by a port. After the configuration, when working in MSTP
mode, the port sends and receives only MSTP packets of the format you have
configured to communicate with devices that send the same format of packets.
I. 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
Ethernet
interface
view or
port
group
view
Configure the mode
the port uses to
recognize/send
MSTP packets
Note:
In MSTP mode, if a port is configured to recognize/send MSTP packets in a 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 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.
Use the command...
system-view
Enter
Ethernet
interface interface-type
interface
interface-number
view
port-group { manual
Enter port
port-group-name |
group view
aggregation agg-id }
stp compliance { auto |
dot1s | legacy }
1-33
Chapter 1 MSTP Configuration
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