Users Guide

Examples of IPv4 and IPv6 Tracking Route Reachability
The following example congures 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 congures 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 congure 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 congured 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
notied. If the timer expires and an object’s state has changed, a notication 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 notied of the event.
If you do not congure a delay, a notication is sent when a change in the state of a tracked object is detected. The time delay in
communicating a state change is specied 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 xed at 255 and changes in the state of a tracked object have no eect.
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.
670 Object Tracking