H3C Technologies H3C SecPath F1000-E - Manual (Page 120)

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NOTE:
•
You can configure the link type as point-to-point for a Layer 2 aggregate interface or a port that works
in full duplex mode. H3C recommends you to use the default setting and let the device to 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 for all MSTIs or VLANs.
• If the physical link to which the port connects is not a point-to-point link but you set it to be one, the
configuration may bring a temporary loop.
Configuring the mode a port uses to recognize/send MSTP
packets
A port can receive/send MSTP packets in the following formats:
• dot1s—802.1s-compliant standard format
• legacy—Compatible format
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 it will send based on the recognized
format.
You can configure the MSTP packet format on a port. When working in MSTP mode after the
configuration, the port sends and receives only MSTP packets of the format you have configured to
communicate with devices that send packets of the same format.
To configure the MSTP packet format to be supported on a port or a group of ports:
Step Command Remarks
1. Enter system view. system-view N/A
2. Enter Ethernet interface view or Layer
2 aggregate interface view.
interface interface-type
interface-number
N/A
3. Configure the mode the port uses to
recognize/send MSTP packets. stp compliance { auto | dot1s |
legacy }
auto by default.
NOTE:
•
MSTP provides MSTP packet format incompatibility guard. In MSTP mode, if a port is configured to
recognize/send MSTP packets in a mode other than auto, and receives a packet in a format different
from the specified type, the port will become a designated port and remain in the discarding state to
prevent the occurrence of a loop.
• MSTP provides MSTP packet format frequent change guard. If a port receives MSTP packets of different
formats frequently, the MSTP packet format configuration contains errors. If the port is working in MSTP
mode, it will be shut down for protection. Ports disabled in this way can be re-activated after a detection
interval. For more information about the detection interval, see Getting Started Guide.