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3-75

Multiple Instance Spanning-Tree Operation

Loop Protection

Loop Protection in Port Mode

To enable loop protection in port mode, follow these steps.

1. Configure port mode with this command:

HP Switch(config)# loop-protect mode port

2. Enter the loop-protect command and specify the port(s) on which loop

protection should be enabled. For example:

HP Switch(config)# loop-protect 1-2

3. You can optionally specify a receiver-action of send-disable to shut down

the port in the event of a loop. For example:

HP Switch(config)# loop-protect 1-2 receiver-action

send-disable

Loop Protection in VLAN Mode

You can only configure VLANs for loop protection when operating in VLAN

mode. When loop-protect is enabled for a VLAN and a loop-protect enabled

interface is a member of that VLAN, loop protect packets are sent on that VLAN

to detect loops.

To enable loop protection in VLAN mode, follow these steps.

1. Configure VLAN mode with this command:

HP Switch(config)# loop-protect mode vlan

2. Enter the loop-protect command and specify the VLANs on which loop

protection should be enabled. For example:

HP Switch(config)# loop-protect vlan 20,30

Changing Modes

When changing from VLAN mode to port mode, you are prompted with a

message, as shown in Figure 3-35. The VLANs will no longer be configured for

loop-protection.

Configure the VLANs on which loop-protect is enabled.

Maximum number of loop-protected VLANS is 32.

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