Users Guide

Examples of IPv4 and IPv6 Tracking Route Reachability
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
Set Tracking Delays
You can configure an optional UP and/or DOWN timer for each tracked object to set the time delay before a change in the
state of a tracked object is communicated to clients. The configured time delay starts when the state changes from UP to
DOWN or the opposite way.
If the state of an object changes back to its former UP/DOWN state before the timer expires, the timer is cancelled and the
client is not notified. If the timer expires and an object’s state has changed, a notification is sent to the client. For example, if the
DOWN timer is running when an interface goes down and comes back up, the DOWN timer is cancelled and the client is not
notified of the event.
If you do not configure a delay, a notification is sent when a change in the state of a tracked object is detected. The time delay
in communicating a state change is specified in seconds.
VRRP Object Tracking
As a client, VRRP can track up to 20 objects (including route entries, and Layer 2 and Layer 3 interfaces) in addition to the 12
tracked interfaces supported for each VRRP group.
You can assign a unique priority-cost value from 1 to 254 to each tracked VRRP object or group interface. The priority cost is
subtracted from the VRRP group priority if a tracked VRRP object is in a DOWN state. If a VRRP group router acts as owner-
master, the run-time VRRP group priority remains fixed at 255 and changes in the state of a tracked object have no effect.
NOTE: In VRRP object tracking, the sum of the priority costs for all tracked objects and interfaces cannot equal or exceed
the priority of the VRRP group.
Object Tracking 615