H3C Technologies H3C S12500-X Series Switches - Manual (Page 97)

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Configuring the port link type
A point-to-point link directly connects two devices. If two root ports or designated ports are connected
over a point-to-point link, they can rapidly transit to the forwarding state after a proposal-agreement
handshake process.
Configuration restrictions and guidelines
• You can configure the link type as point-to-point for a Layer 2 aggregate interface or a port that
operates in full duplex mode. H3C recommends using the default setting and letting the device
automatically detect the port link type.
• The stp point-to-point force-false or stp point-to-point force-true command configured on a port in
MSTP mode is effective on all MSTIs.
• If you configure a non-point-to-point link as a point-to-point link, the configuration might cause a
temporary loop.
Configuration procedure
To configure the link type of a port:
Step Command Remarks
1. Enter system view. system-view N/A
2. Enter Layer 2 Ethernet or
aggregate interface view.
interface interface-type
interface-number
N/A
3. Configure the port link type.
stp point-to-point { auto | force-false
| force-true }
By default, the link type is auto
where the port automatically
detects the link type.
Configuring the mode a port uses to recognize and
send MSTP packets
A port can receive and send MSTP packets in the following formats:
• dot1s—802.1s-compliant standard format
• legacy—Compatible format
When the number of existing MSTIs exceeds 48, the port can send only 802.1s MSTP packets.
By default, the packet format recognition mode of a port is auto. The port automatically distinguishes the
two MSTP packet formats, and determines the format of packets that it will send based on the recognized
format.
You can configure the MSTP packet format on a port. When operating in MSTP mode after the
configuration, the port sends only MSTP packets of the format that you have configured to communicate
with devices that send packets of the same format.