HP 6120XG ProCurve Series 6120 Blade Switches Management and Configuration Gui - Page 280
Changing the Keepalive Interval, Changing the Keepalive Retries, Configuring UDLD for Tagged Ports
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Port Status and Configuration Uni-Directional Link Detection (UDLD) Changing the Keepalive Interval By default, ports enabled for UDLD send a link health-check packet once every 5 seconds. You can change the interval to a value from 10 - 100 deciseconds, where 10 is 1 second, 11 is 1.1 seconds, and so on. For example, to change the packet interval to seven seconds, enter the following command at the global configuration level: ProCurve(config)# link-keepalive interval 70 Changing the Keepalive Retries By default, a port waits five seconds to receive a health-check reply packet from the port at the other end of the link. If the port does not receive a reply, the port tries four more times by sending up to four more health-check packets. If the port still does not receive a reply after the maximum number of retries, the port goes down. You can change the maximum number of keepalive attempts to a value from 3 - 10. For example, to change the maximum number of attempts to 4, enter the following command at the global configuration level: ProCurve(config)# link-keepalive retries 4 Configuring UDLD for Tagged Ports The default implementation of UDLD sends the UDLD control packets untagged, even across tagged ports. If an untagged UDLD packet is received by a non-ProCurve switch, that switch may reject the packet. To avoid such an occurrence, you can configure ports to send out UDLD control packets that are tagged with a specified VLAN. To enable ports to receive and send UDLD control packets tagged with a specific VLAN ID, enter a command such as the following at the interface configuration level: ProCurve(config)#interface l link-keepalive vlan 22 Notes ■ You must configure the same VLANs that will be used for UDLD on all devices across the network; otherwise, the UDLD link cannot be maintained. ■ If a VLAN ID is not specified, then UDLD control packets are sent out of the port as untagged packets. 10-34
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