Product and Software: This article applies to all Aruba controllers running ArubaOS 3.3 and later.
VRRP interface tracking changes the VRRP instance priority then change the VRRP mastership based on the status of the monitored interface(s). These changes are necessary to avoid traffic blackholing if the upstream interface on the controller goes down.
Layer 2 interfaces (physical interfaces) and Layer 3 interfaces (VLAN interfaces) can be tracked.
To track VLAN interface:
tracking vlan <vlanid> add <value> **
tracking vlan <vlanid> sub <value>
To track physical interface:
tracking interface fastethernet/gigabitethernet <slot/port> add <value> **
tracking interface fastethernet/gigabitethernet <slot/port> sub <value>
You will need the "tracking <interface> add <value>" command and the "sub" command if you want to increase the VRRP instance priority after the monitored interface comes back up.
Note: Since ArubaOS 18.104.22.168, tracking interface with add has been removed. The behavior is only subtracting the priority when the monitored VLAN/interface goes down. It will automatically revert back to the configured priority when the monitored VLAN /interface becomes active again.