Dell S4048T-ON, Configuration Manual

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Set Tracking Delays
You can configure 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 configured 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
notified. If the timer expires and an object’s state has changed, a notification 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 notified of the event.
If you do not configure a delay, a notification is sent when a change in the state of a tracked object is detected. The time delay in
communicating a state change is specified 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 fixed at 255 and changes in the state of a tracked object have no effect.
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 Configuration
You can configure three types of object tracking for a client.
• Track Layer 2 Interfaces
• Track Layer 3 Interfaces
• Track an IPv4/IPv6 Route
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 .
• VLAN: Enter
vlan vlan-id
, where valid VLAN IDs are from 1 to 4094
A line-protocol object only tracks the link-level (UP/DOWN) status of a specified interface. When the link-level status goes down, the
tracked object status is DOWN; if the link-level status is up, the tracked object status is UP.
To remove object tracking on a Layer 2 interface, use the
no track object-id
command.
612 Object Tracking