H3C Technologies H3C S7500E Series Switches - Manual (Page 182)

13-30
Configuring the Link Type of Ports
A point-to-point link is a link directly connecting two devices. If the two ports across a point-to-point link
are root ports or designated ports, the ports can rapidly transition to the forwarding state after a
proposal-agreement handshake process.
Make this configuration on the root bridge and on the leaf nodes separately.
Follow these steps to configure the link type of a port or a group of ports:
To do... Use the command... Remarks
Enter system view system-view —
Enter Ethernet
interface view, or
Layer 2 aggregate
interface view
interface interface-type
interface-number
Enter interface
view or port
group view
Enter port group
view
port-group manual port-group-name
Required
Use either command.
Configure the link type of ports
stp point-to-point { auto |
force-false | force-true }
Optional
auto by default, namely, the
port automatically detects
whether its link is
point-to-point.
A Layer 2 aggregate interface 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 MSTIs. 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.
Configuring the Mode a Port Uses to Recognize/Send MSTP Packets
A port can receive/send MSTP packets of two formats:
dot1s : 802.1s-compliant standard format, and
legacy : 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.