HP 6120XG ProCurve Series 6120 Blade Switches Management and Configuration Gui - Page 248
Enabling UDLD, ProCurveconfig#interface al link-keepalive
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Note Port Status and Configuration Uni-Directional Link Detection (UDLD) Syntax: link-keepalive interval Determines the time interval to send UDLD control packets. The parameter specifies how often the ports send a UDLD packet. You can specify from 10 - 100, in 100 ms increments, where 10 is 1 second, 11 is 1.1 seconds, and so on. Default: 50 (5 seconds) Syntax: link-keepalive retries Determines the maximum number of retries to send UDLD control packets. The parameter specifies the maximum number of times the port will try the health check. You can specify a value from 3 - 10. Default: 5 Syntax: [no] interface link-keepalive vlan Assigns a VLAN ID to a UDLD-enabled port for sending of tagged UDLD control packets.Under default settings, untagged UDLD packets can still be transmitted and received on tagged only ports-however, a warning message will be logged. The no form of the command disables UDLD on the specified port(s). Default: UDLD packets are untagged; tagged only ports will transmit and receive untagged UDLD control packets Enabling UDLD UDLD is enabled on a per port basis. For example, to enable UDLD on port a1, enter: ProCurve(config)#interface al link-keepalive To enable the feature on a trunk group, enter the appropriate port range. For example: ProCurve(config)#interface al-a4 link-keepalive When at least one port is UDLD-enabled, the switch will forward out UDLD packets that arrive on non-UDLD-configured ports out of all other non-UDLDconfigured ports in the same vlan. That is, UDLD control packets will "pass through" a port that is not configured for UDLD. However, UDLD packets will be dropped on any blocked ports that are not configured for UDLD. 10-33