Service Manual

Usage Information
Use this command to configure 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
different 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 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.
Configure 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 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 0 to 255. You can configure
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 – configure object tracking on the threshold of an
IPv4 route metric.
• track resolution ip route – configure the protocol-specific resolution value used
to scale an IPv4 route metric.
track interface ip routing
Configure 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[/subport]
information.
• For a 40-Gigabit Ethernet interface, enter the keyword
fortyGigE then the slot/port information.
Object Tracking 1327