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Dell Configuration Guide for the S4048–ON System 9.14.2.6

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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.

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