HP 6120XG HP ProCurve Series 6120 Blade Switches Advanced Traffic Management G - Page 170

Multiple Instance Spanning-Tree Operation Loop Protection Configuring Loop Protection Loop protection provides protection against loops by transmitting loop protocol packets out of ports on which loop protection has been enabled. When the switch sends out a loop protocol packet and then receives the same packet on a port that has a receiver-action of send-disable configured, it shuts down the port from which the packet was sent. To enable loop protection: 1. Enter the loop-protect command and specify the port(s) on which loop protection should be enabled. For example: ProCurve(config)# loop-protect 1-4 2. Specify a receiver-action of send-disable to shut down the port in the event of a loop. For example: ProCurve(config)# loop-protect 1 receiver-action senddisable Syntax: [no] loop-protect [receiver-action ] | [transmit-interval ] | [disable-timer ] | [trap loop-detected] Allows you to configure per-port loop protection on the switch. [receiver-action ] Sets the action to be taken when a loop is detected on the specified port or ports. The port that receives the loop protection packet determines what action is taken. If send-disable is configured, the port that transmitted the packet is disabled. If no-disable is configured, the port is not disabled when a loop is detected. Default: send-disable [trap loop-detected] Allows you to configure loop protection traps for SNMP indicating when a loop has been detected on a port. [disable-timer ] How long (in seconds) a port is disabled when a loop has been detected. A value of zero disables the auto re-enable function. Default: Timer is disabled [transmit-interval ] Allows you to configure the time in seconds between the transmission of loop protection packets. Default: 5 seconds 4-71