222 CHAPTER 23: MSTP CONFIGURATION
Configuration procedure
Follow these steps to configure whether a port or a group of ports connect to
point-to-point links:
n
■ In the case of link aggregation, every port in the aggregation group can be
configured to connect to a point-to-point link. If a port works in
auto-negotiation mode and the negotiation result is full duplex, this port can
be configured as connecting to a point-to-point link.
■ If a port is configured as connecting to a point-to-point link, the setting takes
effect for the port in all MST instances. If the physical link to which the port
connects is not a point-to-point link and you force it to be a point-to-point link
by configuration, the configuration may incur a temporary loop.
Configuration example
# Configure port GigabitEthernet 1/0/1 as connecting to a point-to-point link.
<Sysname> system-view
[Sysname] interface GigabitEthernet 1/0/1
[Sysname-GigabitEthernet1/0/1] stp point-to-point force-true
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.
To do… Use the command… Remarks
Enter system view system-view -
Enter Ethernet
interface view
or port group
view
Enter Ethernet
interface view
interface interface-type
interface-number
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.
Enter port
group view
port-group { manual
port-group-name |
aggregation agg-id }
Configure whether the port(s)
connect to point-to-point links
stp point-to-point { auto |
force-false | force-true }
Optional
The default setting is auto;
namely the device
automatically detects
whether an Ethernet port
connects to a point-to-point
link.
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