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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 – configures object tracking on the threshold of
an IPv4 route metric.
• track resolution ip route – configures 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 information.
• For a 40-Gigabit Ethernet interface, enter the keyword
fortyGigE then the slot/port information.
Object Tracking
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