Administrator Guide

A tracked 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 tracked route is considered to be DOWN.
When you configure 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 configuration,
current state, and clients which track the route.
● track ipv6 route reachability – configures object tracking on the reachability of an IPv4 route.
track resolution ipv6 route
Configure the protocol-specific 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 S6000-ON.
8.3.12.0 Introduced on the S4810.
8.4.1.0 Introduced.
Usage
Information
Use this command to configure the protocol-specific 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-configurable threshold (the
threshold metric command) for a route’s metric 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 protocol-specific resolution value calculates the scaled metric by dividing a route's cost by the
resolution value set for the route protocol:
● For ISIS, you can set the resolution in the range 1 to 1000, where the default is 10.
● For OSPF, you can set the resolution in the range 1 to 1592, where the default is 1.
● The resolution value used to map static routes is not configurable. By default, Dell Networking OS
assigns a metric of 0 to static routes.
● The resolution value used to map RIP routes is not configurable. The RIP hop-count is automatically
multiplied by 16 to scale it. For example, a RIP metric of 16 (unreachable) scales to 256, which
considers the route to be DOWN.
Related
Commands
● threshold metric – configures the metric threshold used to determine the UP and/or DOWN state of a
tracked route.
Object Tracking 843