Concept Guide

For example, consider that the next-hop address is changed and the track reachability is checked after the set refresh interval (20
seconds). If the reachability to the next-hop address is failed, the system displays the following log stating that the track object state is
changed from UP to DOWN.
Sep 28 11:08:57 %STKUNIT1-M:CP %OTM-6-STATE: Object 2 state transition from Up to Down.
Set Tracking Delays
You can congure an optional UP and/or DOWN timer for each tracked object to set the time delay before a change in the state of a
tracked object is communicated to clients. The congured time delay starts when the state changes from UP to DOWN or the opposite
way.
If the state of an object changes back to its former UP/DOWN state before the timer expires, the timer is cancelled and the client is not
notied. If the timer expires and an object’s state has changed, a notication is sent to the client. For example, if the DOWN timer is
running when an interface goes down and comes back up, the DOWN timer is cancelled and the client is not notied of the event.
If you do not congure a delay, a notication is sent when a change in the state of a tracked object is detected. The time delay in
communicating a state change is specied in seconds.
VRRP Object Tracking
As a client, VRRP can track up to 20 objects (including route entries, and Layer 2 and Layer 3 interfaces) in addition to the 12 tracked
interfaces supported for each VRRP group.
You can assign a unique priority-cost value from 1 to 254 to each tracked VRRP object or group interface. The priority cost is subtracted
from the VRRP group priority if a tracked VRRP object is in a DOWN state. If a VRRP group router acts as owner-master, the run-time
VRRP group priority remains xed at 255 and changes in the state of a tracked object have no eect.
NOTE
: In VRRP object tracking, the sum of the priority costs for all tracked objects and interfaces cannot equal or exceed the
priority of the VRRP group.
Object Tracking Conguration
You can congure three types of object tracking for a client.
• Track Layer 2 Interfaces
• Track Layer 3 Interfaces
• Track IPv4 and IPv6 Routes
For a complete listing of all commands related to object tracking, refer to the Dell Networking OS Command Line Interface Reference
Guide.
Tracking a Layer 2 Interface
You can create an object that tracks the line-protocol state of a Layer 2 interface and monitors its operational status (UP or DOWN).
You can track the status of any of the following Layer 2 interfaces:
• 1 Gigabit Ethernet: Enter gigabitethernet slot/port in the track interface interface command (see Step 1).
• 10 Gigabit Ethernet: Enter tengigabitethernet slot/port.
• Port channel: Enter port-channel number, where valid port-channel numbers are from 1 to 128:
• SONET: Enter sonet slot/port.
• VLAN: Enter vlan vlan-id, where valid VLAN IDs are from 1 to 4094
Object Tracking
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