Deployment Guide

● The Layer 3 status of an IPv6 interface goes DOWN when its Layer 2 status goes down or the IPv6 address is removed from
the routing table. For a Layer 3 VLAN, all VLAN ports must be down.
To remove object tracking on a Layer 3 IPv4 or IPv6 interface, use the no track object-id command.
To configure object tracking on the routing status of a Layer 3 interface, use the following commands.
1. Configure object tracking on the routing status of an IPv4 or IPv6 interface.
CONFIGURATION mode
track object-id interface interface {ip routing | ipv6 routing}
Valid object IDs are from 1 to 65535.
2. (Optional) Configure the time delay used before communicating a change in the status of a tracked interface.
OBJECT TRACKING mode
delay {[up seconds] [down seconds]}
Valid delay times are from 0 to 180 seconds.
The default is 0.
3. (Optional) Identify the tracked object with a text description.
OBJECT TRACKING mode
description text
The text string can be up to 80 characters.
4. (Optional) Display the tracking configuration and the tracked object’s status.
EXEC Privilege mode
show track object-id
Example of configuring object tracking for an IPv4 interface.
Dell(conf)#track 101 interface tengigabitethernet 7/2/1 ip routing
Dell(conf-track-101)#delay up 20
Dell(conf-track-101)#description NYC metro
Dell(conf-track-101)#end
Dell#show track 101
Track 101
Interface TenGigabitEthernet 7/2/1 ip routing
Description: NYC metro
Example of configuring object tracking for an IPv6 interface.
Dell(conf)#track 103 interface tengigabitethernet 7/11/1 ipv6
routing
Dell(conf-track-103)#description Austin access point
Dell(conf-track-103)#end
Dell#show track 103
Track 103
Interface TenGigabitEthernet 7/11/1 ipv6 routing
Description: Austin access point
Configuring track reachability refresh interval
If there is no entry in ARP table or 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 to see if the next-hop address
appear in the ARP cache before considering it as DOWN.
You can change the refresh interval for which the next-hop address is checked. The default refresh interval is 60 seconds. The
object tracking is done after the default refresh interval everytime and whenever there is a change in reachability state, the
next-hop will be considered as DOWN. The default interval is changed using the track reachability refresh command.
You can disable the track reachability feature by setting the refresh interval to 0.
To change the refresh interval for tracking an IPv4 or IPv6 route, use the following command.
Change the reachability refresh interval for tracking of an IPv4 or IPv6 route.
Object Tracking
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