Users Guide

Version Description
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.
Related
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.
track reachability refresh
Change the refresh interval for tracking the reachability of the next-hop. If the next-hop address in the ARP cache ages out
for a route tracked for its reachability, an attempt is made to check if the next-hop address is reachable after a certain refresh
interval before considering the route DOWN.
Syntax
track reachability refresh interval
Parameters
interval Enter the refresh interval, in seconds, for object tracking reachability. The range is
from 0 to 60 seconds. The default is 60.
Defaults Enabled
Command Modes CONFIGURATION
Command
History
This guide is platform-specific. For command information about other platforms, see the relevant Dell
EMC Networking OS Command Line Reference Guide.
Version Description
9.10(0.1) Introduced on the S6010-ON and S4048T-ON.
9.10(0.0) Introduced on the S3148.
9.10(0.0) Introduced on the S6100-ON.
9.8(2.0) Introduced on the S3100 series.
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
To disable the attempt to track the reachability of next-hop after the configured refresh interval, set the
refresh interval as 0.
Related
Commands
● show track – display information about tracked objects, including configuration, current state, and
clients which track the object.
Object Tracking 1095