Configuring VRRP-E load-balancing using short-path forwarding

VRRP-E traffic can be load-balanced using short-path forwarding on the backup devices.

Before you begin

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

About this task

Perform this task on all backup VRRP-E Layer 3 devices to allow load sharing within a VRRP extended group.

Procedure

From privileged EXEC mode, enter global configuration mode.
```
device# configure terminal
```
Globally enable VRRP-E.
```
device(config)# 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 IP address for the interface using the ip address command.
```
device(config-ve-2019)# ip address 192.168.4.1/24
```
Enter the vrrp-extended-group command with a number to assign a VRRP-E group to the device.
```
device(config-ve-2018)# vrrp-extended-group 19
```
In this example, VRRP-E 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.

Example

In the following example, short-path forwarding is configured on a backup VRRP-E 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)# protocol vrrp-extended
device(config)# interface ve 2019
device(config-ve-2019)# ip address 192.168.4.1/24
device(config-ve-2019)# vrrp-extended-group 19
device(config-vrrp-extended-group-19)# short-path-forwarding revert-priority 50