Administrator Guide

ip-address/
prefix-len
Enter an IPv4 address in dotted decimal format. The valid IPv4 prefix lengths are from /0
to /32.
Defaults none
Command Modes CONFIGURATION
Command History
This guide is platform-specific. For command information about other platforms, refer to the relevant Dell
Networking OS Command Line Reference Guide.
The following is a list of the Dell Networking OS version history for this command.
Version Description
9.9(0.0) Introduced on the C9010.
9.8(0.0) Introduced on the S3048-ON and S4048-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 address resolution protocol (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 if the next-hop address appears before considering the route DOWN.
Related
Commands
• show track – displays information about tracked objects, including configuration, current state, and clients
which track the object.
• track ip route metric threshold – configures 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.
Object Tracking 1099