Concept Guide

Enter an IPv6 address in X:X:X:X::X format; valid IPv6 prefix lengths are from / 0 to /128.
(Optional) E-Series only: For an IPv4 route, you can enter a VRF name to specify the virtual routing table to which the
tracked route belongs.
2. (Optional) Configure the time delay used before communicating a change in the status of a tracked route.
OBJECT TRACKING mode
delay {[up seconds] [down seconds]}
Valid delay times are from 0 to 180 seconds.
The default is 0.
3. (Optional) Identify the tracked object with a text description.
OBJECT TRACKING mode
description text
The text string can be up to 80 characters.
4. (Optional) Display the tracking configuration and the tracked object’s status.
EXEC Privilege mode
show track object-id
The following example configures object tracking on the reachability of an IPv4 route.
Dell(conf)#track 104 ip route 10.0.0.0/8 reachability
Dell(conf-track-104)#delay up 20 down 10
Dell(conf-track-104)#end
Dell#show track 104
Track 104
IP route 10.0.0.0/8 reachability
Reachability is Down (route not in route table)
2 changes, last change 00:02:49
Tracked by:
Dell#configure
Dell(conf)#track 4 ip route 3.1.1.0/24 reachability vrf
vrf1
The following example configures object tracking on the reachability of an IPv6 route.
Dell(conf)#track 105 ipv6 route 1234::/64 reachability
Dell(conf-track-105)#delay down 5
Dell(conf-track-105)#description Headquarters
Dell(conf-track-105)#end
Dell#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
628
Object Tracking