Command Line Reference Guide

948 | Object Tracking
www.dell.com | support.dell.com
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 see if the next-hop address appears before considering the
route DOWN.
track interface ip routing
c e s
Configure object tracking on the routing status of an IPv4 Layer 3 interface.
Syntax
track object-id interface interface ip routing
To return to the default setting, enter no track object-id.
Parameters
Defaults
None
Command Modes
CONFIGURATION
Command
History
Related
Commands
Usage
Information
Use this command to create an object that tracks the routing state of an IPv4 Layer 2 interface:
• The status of the IPv4 interface is UP only if the Layer 2 status of the interface is UP and the
interface has a valid IP address.
object-id
Enter the ID number of the tracked object. Range: 1 to 65535.
interface
Enter one of the following values:
• For a 1-Gigabit Ethernet interface, enter gigabitethernet slot-number/port-number.
• For a Loopback interface, enter loopback number, where number is from 0 to 16383.
• For a Port Channel interface, enter port-channe
l number, where the valid values are:
C-Series and S-Series: 1 to 128
E-Series: 1 to 255 for TeraScale; 1 to 512 for ExaScale.
• For SONET interfaces, enter the sonet slot-number/port-number.
• For a 10-Gigabit Ethernet interface, enter tengigabitethernet slot-number/port-number
• For a VLAN interface, enter vlan number, where number is from 1 to 4094.
Version 8.4.1.0 Introduced
show track Display information about tracked objects, including configuration, current state,
and clients which track the object.
track interface line-protocol Configure object tracking on the line-protocol state of a Layer 2 interface.