3Com WX3000 Stp interface interface-type, Interface-number compliance, Auto dot1s legacy

Configuration example

# Set the bridge priority of the current device to 4,096 in spanning tree instance 1.

<device> system-view

[device] stp instance 1 priority 4096

Configuring the Mode a Port Recognizes and Sends MSTP Packets

A port can be configured to recognize and send MSTP packets in the following modes.

z

z

z

Automatic mode. Ports in this mode determine the format of the MSTP packets to be sent according to the format of the received packets.

Legacy mode. Ports in this mode recognize/send packets in legacy format.

802.1s mode. Ports in this mode recognize/send packets in dot1s format.

A port acts as follows according to the format of MSTP packets forwarded by a peer device or router.

When a port operates in the automatic mode:

z

z

The port automatically determines the format (legacy or dot1s) of received MSTP packets and then determines the format of the packets to be sent accordingly, thus communicating with the peer devices.

If the format of the received packets changes repeatedly, MSTP will shut down the corresponding port to prevent network storm. A port shut down in this way can only be brought up by the network administrator.

When a port operates in the legacy mode:

z

z

The port only recognizes and sends MSTP packets in legacy format. In this case, the port can only communicate with the peer through packets in legacy format.

If packets in dot1s format are received, the port turns to discarding state to prevent network storm.

When a port operates in the 802.1s mode:

z

z

The port only recognizes and sends MSTP packets in dot1s format. In this case, the port can only communicate with the peer through packets in dot1s format.

If packets in legacy format are received, the port turns to discarding state to prevent network storm.

Configuration procedure

Follow these steps to configure the mode a port recognizes and sends MSTP packets (in system view):

To do…	Use the command…	Remarks
Enter system view	system-view	—
		Required
		By default, a port recognizes
Configure the mode a port	stp interface interface-type	and sends MSTP packets in the
		automatic mode. That is, it
recognizes and sends MSTP	interface-number compliance
		determines the format of
packets	{ auto dot1s legacy }
		packets to be sent according to
		the format of the packets
		received.

Follow these steps to configure the mode a port recognizes and sends MSTP packets (in Ethernet port view):

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