Deployment Guide

Usage Information
Use this command to congure the UP and/or DOWN threshold for the scaled metric of a tracked IPv4 or IPv6
route.
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.
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 10-Gigabit Ethernet interface, enter the keyword TenGigabitEthernet then
the slot/port information.
• For a 40-Gigabit Ethernet interface, enter the keyword fortyGigE 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
292 Object Tracking