Dell PowerSwitch S4820T Configuration Guide for the S4820T System 9.100.0 - Page 566

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. To configure object tracking on the status of a Layer 2 interface, use the following commands. 1 Configure object tracking on the line-protocol state of a Layer 2 interface. CONFIGURATION mode 566 Object Tracking