Dell C9000 Series Networking Configuration Manual page 1227

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NOTE:
When you reload a node that contains VRRP configuration and is enabled for VLT, Dell Networking
recommends that you configure the reload timer by using the vrrp delay reload command to ensure
that VRRP is functional. Otherwise, when you reload a VLT node configured for VRRP, the local
destination address is not seen on the reloaded node causing suboptimal routing.
Set the delay timer on individual interfaces. The delay timer is supported on all physical interfaces, VLANs, and
LAGs.
When you configure both CLIs, the later timer rules VRRP enabling. For example, if you set vrrp delay
reload 600 and vrrp delay minimum 300, the following behavior occurs:
When the system reloads, VRRP waits 600 seconds (10 minutes) to bring up VRRP on all interfaces that
are up and configured for VRRP.
When an interface comes up and becomes operational, the system waits 300 seconds (5 minutes) to
bring up VRRP on that interface.
To set the delay time for VRRP initialization, use the following commands.
Set the delay time for VRRP initialization on an individual interface.
INTERFACE mode
vrrp delay minimum seconds
This time is the gap between an interface coming up and being operational, and VRRP enabling.
The seconds range is from 0 to 900.
The default is 0.
Set the delay time for VRRP initialization on all the interfaces in the system configured for VRRP.
INTERFACE mode
vrrp delay reload seconds
This time is the gap between system boot up completion and VRRP enabling.
The seconds range is from 0 to 900.
The default is 0.
Track an Interface or Object
You can set Dell Networking OS to monitor the state of any interface according to the virtual group.
Each VRRP group can track up to 12 interfaces and up to 20 additional objects, which may affect the priority
of the VRRP group. If the tracked interface goes down, the VRRP group's priority decreases by a default value
of 10 (also known as cost). If the tracked interface's state goes up, the VRRP group's priority increases by 10.
The lowered priority of the VRRP group may trigger an election. As the Master/Backup VRRP routers are
selected based on the VRRP group's priority, tracking features ensure that the best VRRP router is the Master
for that group. The sum of all the costs of all the tracked interfaces must be less than the configured priority
on the VRRP group. If the VRRP group is configured as Owner router (priority 255), tracking for that group is
disabled, irrespective of the state of the tracked interfaces. The priority of the owner group always remains at
255.
Virtual Router Redundancy Protocol (VRRP)
1227

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