Users Guide

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 reachability of an IPv6 route. In order for a route’s
reachability to be tracked, the route must appear as an entry in the routing table.
A tracked 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 tracked route is considered to be DOWN.
When you congure IPv6 route reachability as a tracked object, the UP/DOWN state of the tracked route is
also determined by the entry of the next-hop address in the ARP cache. A tracked route is considered to be
reachable if there is an ARP cache entry for the route's next-hop address.
If the next-hop address in the ARP cache ages out for a route tracked for its reachability, an attempt is
made to regenerate the ARP cache entry to if the next-hop address appears before considering the route
DOWN.
Related Commands
• show track ipv6 route – displays information about tracked IPv6 routes, including conguration, current
state, and clients which track the route.
track resolution ipv6 route
Congure the protocol-specic resolution value used to scale an IPv6 route metric.
Syntax
track resolution ipv6 route {isis resolution-value | ospf resolution-value}
To return to the default setting, use the no track object-id command.
Parameters
object-id Enter the ID number of the tracked object. Use the range to 1 to 500.
isis resolution-value Enter the resolution used to convert the metric in the routing table for ISIS routes
to a scaled metric.
ospf resolution-
value
Enter the resolution used to convert the metric in the routing table for OSPF
routes to a scaled metric.
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 congure the protocol-specic resolution value that converts the actual metric of an
IPv6 route in the routing table to a scaled metric in the range 0 to 255.
The UP/DOWN state of a tracked IPv6 route is determined by the user-congurable threshold (the
threshold metric command) for a route’s metric 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.
Object Tracking
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