3Com WX3000 Configuring Digest Snooping, Configuring Bpdu Dropping, Interface interface-name

# Set the maximum times for the device to remove the MAC address table within 10 seconds to 5.

<device> system-view

[device] stp tc-protection threshold 5

Configuring BPDU Dropping

Follow these steps to configure BPDU dropping:

To do…	Use the command…	Remarks
Enter system view	system-view	—
Enter Ethernet port view	interface interface-name	—
		Required
Enable BPDU dropping	bpdu-drop any	BPDU dropping is disabled by
		default.

# Enable BPDU dropping on GigabitEthernet 1/0/1.

<device>system-view

[device] interface GigabitEthernet1/0/1

[device-GigabitEthernet1/0/1] bpdu-drop any

Configuring Digest Snooping

Introduction

According to IEEE802.1s, two interconnected devices can communicate with each other through MSTIs in an MST region only when the two devices have the same MST region-related configuration. Interconnected MSTP-enabled devices determine whether or not they are in the same MST region by checking the configuration IDs of the BPDUs between them. (A configuration ID contains information such as region ID and configuration digest.)

As some other vendors' devices adopt proprietary spanning tree protocols, they cannot communicate with the other devices in an MST region even if they are configured with the same MST region-related settings as the other devices in the MST region.

This problem can be solved by implementing the digest snooping feature. If a port on a device is connected to another vendor's device that has the same MST region-related configuration as its own but adopts a proprietary spanning tree protocol, you can enable digest snooping on the port. Then the device regards devices of another manufacturer as in the same region; it records the configuration digests carried in the BPDUs received from the devices of another vendor, and put them in the BPDUs to be sent to these devices. In this way, the device can communicate with the devices of another vendor in the same MST region.

The digest snooping function is not applicable to edge ports.

1-39