Users Guide

Related Commands
• show track ipv6 route – displays information about tracked IPv6 routes, including conguration, current state,
and clients which track the route.
• track interface ip routing – congures object tracking on the routing status of an IPv4 Layer 3 interface.
track ipv6 route metric threshold
Congure 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/
prex-len
Enter an IPv6 address in X:X:X:X::X format. The valid IPv6 prex 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 prex
length match a table entry. For example, when congured 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 prex
length, the status of the tracked route is considered to be DOWN.
When you congure 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 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.
You congure 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 notication of a change in
the state of a tracked object is sent when a metric value crosses a congured threshold.
Related Commands
• show track ipv6 route – displays information about tracked IPv6 routes, including conguration, current state,
and clients which track the route.
300 Object Tracking