Configuring VRRP-Ev3 load-balancing

Before configuring VRRP-Ev3 load-balancing, VRRP-Ev3 must be configured on all devices in the VRRP-Ev3 session.

Perform this task on all backup VRRP-Ev3 Layer 3 devices to allow load sharing within an IPv6 VRRP extended group.

Use the configure terminal command to enter global configuration mode.
```
device# configure terminal
```

Globally enable VRRP-Ev3.

device(config)# ipv6 protocol vrrp-extended

Enter the interface ve command with an associated VLAN number.
```
device(config)# interface ve 2019
```
In this example, virtual Ethernet (ve) configuration mode is entered and the interface is assigned with a VLAN number of 2019.
Enter an IPv6 address for the interface using the ipv6 address command.
```
device(config-ve-2019)# ipv6 address 2001:2019:8192::122/64
```
Enter the ipv6 vrrp-extended-group command with a number to assign a VRRP-E group to the device.
```
device(config-ve-2018)# ipv6 vrrp-extended-group 19
```
In this example, VRRP-Ev3 group configuration mode is entered.
Enter the short-path-forwarding command with a revert-priority value to configure the backup VRRP-E as an alternate path with a specified priority.
```
device(config-vrrp-extended-group-19)# short-path-forwarding revert-priority 50
```
When the backup device priority is higher than the configured revert-priority value, the backup router is able to perform short-path forwarding. If the backup priority is lower than the revert priority, short-path forwarding is disabled.

In the following example, short-path forwarding is configured on a backup VRRP-Ev3 device and a revert priority threshold is configured. If the backup device priority falls below this threshold, short-path forwarding is disabled.

device# configure
device(config)# ipv6 protocol vrrp-extended
device(config)# interface ve 2019
device(config-ve-2019)# ipv6 address 2001:2019:8192::122/64
device(config-ve-2019)# ipv6 vrrp-extended-group 19
device(config-vrrp-extended-group-19)# short-path-forwarding revert-priority 50