When you configure the threshold of an IPv6 route metric as a tracked object, the
UP/DOWN state of the tracked route is also determined by the current metric for
the route 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.
You configure the UP and DOWN thresholds for each tracked IPv6 route by using
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.
Related
Commands •show track ipv6 route – displays information about tracked IPv6 routes,
including configuration, current state, and clients which track the route.
•threshold metric – configures the metric threshold used to determine the UP
and/or DOWN state of a tracked route.
•track resolution ipv6 route – configures the protocol-specific resolution value
used to scale an IPv6 route metric.
track ipv6 route reachability
Configure object tracking on the reachability of an IPv6 route.
Syntax track object-id ipv6 route ip-address/prefix-len reachability
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.
ipv6-address/
prefix-len
Enter an IPv6 address in X:X:X:X::X format. The valid IPv6
prefix lengths are from /0 to / 128.
Defaults none
Command
Modes
CONFIGURATION
Command
History Version Description
9.7(0.0) Introduced on the S6000-ON.
8.3.12.0 Introduced on the S4810.
1056 Object Tracking