Users Guide

Defaults None

Command Modes CONFIGURATION

Command History

This guide is platform-specific. For command information about other platforms, see

the relevant Dell Networking OS Command Line Reference Guide.

Version Description

9.10(0.1) Introduced on the S6010-ON and S4048T-ON.

9.8(1.0) Introduced on the Z9100-ON.

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 reachability of an IPv4 route. In

order for a route’s reachability to be tracked, the route must appear as an entry in the

routing table.

A tracked IPv4 route is considered to match an entry in the routing table only if the

exact IPv4 address and prefix length match a table entry. For example, when configured

as a tracked route, 10.0.0.0/24 does not match the routing table entry 10.0.0.0/8. If no

route-table entry has the exact IPv4 address and prefix length, the status of the tracked

route is considered to be DOWN.

When you configure IPv4 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.

Commands

• show track – display information about tracked objects, including configuration,

current state, and clients which track the object.

• track ip route metric threshold – configure object tracking on the threshold of an

IPv4 route metric.

Object Tracking 1353