Users Guide

Determine the UP/DOWN state of a tracked route by the threshold for the current value of the route metric
in the routing table. To provide a common tracking interface for dierent clients, route metrics are scaled in
the range 0 to 255, where 0 is connected and 255 is inaccessible. The scaled metric value communicated to
a client always considers a lower value to have priority over a higher value.
The resulting scaled value is compared against the congured 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.
Congure the UP and DOWN thresholds for each tracked route with the threshold metric command.
The default UP threshold is 254; the default DOWN threshold is 255. The notication of a change in the
state of a tracked object is sent when a metric value crosses a congured threshold.
The tracking process uses a protocol-specic resolution value to convert the actual metric in the routing
table to a scaled metric in the range 0 to 255. You can congure the resolution value used to scale route
metrics for supported protocols with the track resolution ip route and track resolution
ipv6 route
commands.
Related Commands
• track ip route metric threshold – congures object tracking on the threshold of an IPv4 route metric.
• track resolution ip route – congures the protocol-specic resolution value used to scale an IPv4 route
metric.
track interface ip routing
Congure object tracking on the routing status of an IPv4 Layer 3 interface.
Syntax
track object-id interface interface ip routing
To return to the default setting, use the no track object-id command.
Parameters
object-id Enter the ID number of the tracked object. The range is 1 to 500.
interface Enter one of the following values:
• For a 1-Gigabit Ethernet interface, enter the keyword GigabitEthernet
then the slot/port information.
• For a 10-Gigabit Ethernet interface, enter the keyword
TenGigabitEthernet then the slot/port information.
•
For a Loopback interface, enter the keyword loopback then a number from 0
to 16383.
• For a port channel interface, enter the keywords port-channel then a
number.
• For a tunnel interface, enter the keyword tunnel.
• For a VLAN interface, enter the keyword vlan then a number from 1 to 4094.
Defaults none
Command Modes CONFIGURATION
1016
Object Tracking