Setup Guide

Track 103
Interface TenGigabitEthernet 7/11/1 ipv6 routing
Description: Austin access point
Conguring 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.
Displaying Tracked Objects
To display the currently congured objects used to track Layer 2 and Layer 3 interfaces, and IPv4 and IPv6 routes, use the following show
commands.
To display the conguration and status of currently tracked Layer 2 or Layer 3 interfaces, IPv4 or IPv6 routes, or a VRF instance, use the
show track command. You can also display the currently congured per-protocol resolution values used to scale route metrics when
tracking metric thresholds.
• Display the conguration and status of currently tracked Layer 2 or Layer 3 interfaces, IPv4 or IPv6 routes, and a VRF instance.
show track [object-id [brief] | interface [brief] [vrf vrf-name] | ip route [brief] [vrf vrf-
name] | resolution | vrf vrf-name [brief] | brief]
• Display the tracking conguration of a specied object or all objects that are currently congured on the router.
show running-config track [object-id]
Example of the show track command.
Dell#show track
Track 1
IP route 23.0.0.0/8 reachability
Reachability is Down (route not in route table)
2 changes, last change 00:16:08
Tracked by:
680
Object Tracking