Administrator Guide

priority over a higher value. The resulting scaled value is compared against the configured threshold values to determine the
state of a tracked route as follows:
○ If the scaled metric for a route entry is less than or equal to the UP threshold, the state of a route is UP.
○ If the scaled metric for a route is greater than or equal to the DOWN threshold or the route is not entered in the routing
table, the state of a route is DOWN.
The UP and DOWN thresholds are user-configurable for each tracked route. The default UP threshold is 254; the default
DOWN threshold is 255. The notification of a change in the state of a tracked object is sent when a metric value crosses a
configured threshold.
The tracking process uses a protocol-specific resolution value to convert the actual metric in the routing table to a scaled
metric in the range from 0 to 255. The resolution value is user-configurable and calculates the scaled metric by dividing a
route’s cost by the resolution value set for the route type:
○ For ISIS, you can set the resolution in the range from 1 to 1000, where the default is 10.
○ For OSPF, you can set the resolution in the range from 1 to 1592, where the default is 1.
○ The resolution value used to map static routes is not configurable. By default, Dell EMC Networking OS assigns a metric
of 0 to static routes.
○ The resolution value used to map RIP routes is not configurable. The RIP hop-count is automatically multiplied by 16 to
scale it. For example, a RIP metric of 16 (unreachable) scales to 256, which considers a route to be DOWN.
Tracking Route Reachability
Use the following commands to configure object tracking on the reachability of an IPv4 or IPv6 route.
To remove object tracking, use the no track object-id command.
1. Configure object tracking on the reachability of an IPv4 or IPv6 route.
CONFIGURATION mode
track object-id {ip route ip-address/prefix-len | ipv6 route ipv6-address/prefix-len}
reachability [vrf vrf-name]
Valid object IDs are from 1 to 500.
Enter an IPv4 address in dotted decimal format; valid IPv4 prefix lengths are from / 0 to /32.
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:
DellEMC(conf)#track 104 ip route 10.0.0.0/8 reachability
DellEMC(conf-track-104)#delay up 20 down 10
DellEMC(conf-track-104)#end
DellEMC#show track 104
Track 104
IP route 10.0.0.0/8 reachability
Reachability is Down (route not in route table)
Object Tracking
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