Users Guide

Related Commands
• show track ipv6 route – displays information about tracked IPv6 routes, including configuration, current state,
and clients which track the route.
• track interface ip routing – configures object tracking on the routing status of an IPv4 Layer 3 interface.
track ipv6 route metric threshold
Configure object tracking on the threshold of an IPv4 route metric.
Syntax
track object-id ipv6 route ipv6-address/prefix-len metric threshold
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 M I/O Aggregator.
Usage Information
Use this command to create an object that tracks the UP and/or DOWN threshold of an IPv6 route metric. In
order for a route’s metric to be tracked, the route must appear as an entry in the routing table.
A tracked IPv6 route is considered to match an entry in the routing table only if the exact IPv6 address and prefix
length match a table entry. For example, when configured as a tracked route, 3333:100:200:300:400::/80 does
not match routing table entry 3333:100:200:300::/64. If no route-table entry has the exact IPv6 address and
prefix length, the status of the tracked route is considered to be DOWN.
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.
Object Tracking 297