Dell PowerSwitch S4820T Configuration Guide for the S4820T System 9.14.1.0 - Page 624
track reachability refresh interval, Tracking a Metric Threshold
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The following example configures object tracking on the reachability of an IPv6 route: DellEMC(conf)#track 105 ipv6 route 1234::/64 reachability DellEMC(conf-track-105)#delay down 5 DellEMC(conf-track-105)#description Headquarters DellEMC(conf-track-105)#end DellEMC#show track 105 Track 105 IPv6 route 1234::/64 reachability Description: Headquarters Reachability is Down (route not in route table) 2 changes, last change 00:03:03 Configuring track reachability refresh interval If there is no entry in ARP table or if the next-hop address in the ARP cache ages out for a route tracked for its reachability, an attempt is made to check if the next-hop address is reachable after a certain refresh interval to see if the next-hop address appear in the ARP cache before considering it as DOWN. You can change the refresh interval for which the next-hop address is checked. The default refresh interval is 60 seconds. The object tracking is done after the default refresh interval everytime and whenever there is a change in reachability state, the next-hop will be considered as DOWN. The default interval is changed using the track reachability refresh command. You can disable the track reachability feature by setting the refresh interval to 0. To change the refresh interval for tracking an IPv4 or IPv6 route, use the following command. Change the reachability refresh interval for tracking of an IPv4 or IPv6 route. CONFIGURATION mode track reachability refresh interval The refresh interval range is from 0 to 60 seconds. The default is 60 seconds. Examples of IPv4 and IPv6 Tracking Route Reachability The following example shows how to change the refresh interval for tracking the reachability of the next-hop: DellEMC#configure DellEMC(conf)#track reachability refresh 20 For example, consider that the next-hop address is changed and the track reachability is checked after the set refresh interval (20 seconds). If the reachability to the next-hop address is failed, the system displays the following log stating that the track object state is changed from UP to DOWN. Sep 28 11:08:57 %STKUNIT1-M:CP %OTM-6-STATE: Object 2 state transition from Up to Down. Tracking a Metric Threshold Use the following commands to configure object tracking on the metric threshold of an IPv4 or IPv6 route. To remove object tracking, use the no track object-id command. 1 (Optional) Reconfigure the default resolution value used by the specified protocol to scale the metric for IPv4 or IPv6 routes. CONFIGURATION mode track resolution {ip route | ipv6 route} {isis resolution-value | ospf resolution-value} The range of resolution values is: • ISIS routes - 1 to 1000. The default is 1. 624 Object Tracking
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