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track ipv6 route metric threshold
c e s
Syntax
Parameters
Defaults
Command Modes
Command
History
Related
Commands
Usage
Information
1002
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Object Tracking
Configure object tracking on the threshold of an IPv4 route metric.
track object-id ipv6 route ipv6-address/prefix-len metric threshold
To return to the default setting, enter no track object-id.
object-id
Enter the ID number of the tracked object. Range: 1 to 65535.
ipv6-address/
Enter an IPv6 address in X:X:X:X::X format. Valid IPv6 prefix lengths are from /0 to /
128.
prefix-len
None
CONFIGURATION
Version 8.4.1.0
Introduced
show track ipv6
Display information about tracked IPv6 routes, including configuration, current state, and
route
clients which track the route.
threshold metric
Configure the metric threshold used to determine the UP and/or DOWN state of a tracked
route.
track resolution
Configure the protocol-specific resolution value used to scale an IPv6 route metric.
ipv6 route
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
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.
threshold metric
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