Deployment Guide

Track IPv4 and IPv6 Routes
You can create an object that tracks an IPv4 or IPv6 route entry in the routing table.
Specify a tracked route by its IPv4 or IPv6 address and prex-length. Optionally specify a tracked route by a virtual routing and forwarding
(VRF) instance name if the route to be tracked is part of a VRF. The next-hop address is not part of the denition of the tracked object.
A tracked route matches a route in the routing table only if the exact address and prex length match an entry in the routing table. For
example, when congured as a tracked route, 10.0.0.0/24 does not match the routing table entry 10.0.0.0/8. If no route-table entry has the
exact address and prex length, the tracked route is considered to be DOWN.
In addition to the entry of a route in the routing table, you can congure how the status of a route is tracked in either the following ways:
• By the reachability of the route's next-hop router.
• By comparing the UP or DOWN threshold for a route’s metric with current entries in the route table.
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.
Object Tracking Conguration
You can congure three types of object tracking for a client.
• Track Layer 2 Interfaces
• Track Layer 3 Interfaces
• Track an IPv4/IPv6 Route
For a complete listing of all commands related to object tracking, refer to the Dell Networking OS Command Line Interface Reference
Guide.
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Object Tracking