Service Manual
Version Description
9.8(0.0P5) Introduced on the S4048-ON.
9.8(0.0P2) Introduced on the S3048-ON.
9.7(0.0) Introduced on the S6000-ON.
8.3.12.0 Introduced on the S4810.
8.4.1.0 Introduced.
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 prex
length match a table entry. For example, when congured 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 prex
length, the status of the tracked route is considered to be DOWN.
When you congure 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 dierent 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 congured 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 congure 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 notication of a change in
the state of a tracked object is sent when a metric value crosses a congured threshold.
Related Commands
• show track ipv6 route – display information about tracked IPv6 routes, including conguration, current state,
and clients which track the route.
• threshold metric – congure the metric threshold used to determine the UP and/or DOWN state of a tracked
route.
• track resolution ipv6 route – congure the protocol-specic resolution value used to scale an IPv6 route metric.
track ipv6 route reachability
Congure 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/
prex-len
Enter an IPv6 address in X:X:X:X::X format. The valid IPv6 prex lengths are from /0 to /
128.
Defaults None
Object Tracking 1083