Figure 34: Basic Vrrp For Ipv4 Family - Juniper ACX1000 Configuration Manual

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ACX Series Universal Access Router Configuration Guide

You can configure VRRP on Integrated Routing and Bridging (IRB)

Routers running VRRP dynamically elect master and backup routers. You can also force

assignment of master and backup routers using priorities from 1 through 255, with 255

being the highest priority. In VRRP operation, the default master router sends

advertisements to backup routers at regular intervals. The default interval is 1 second. If

a backup router does not receive an advertisement for a set period, the backup router

with the next highest priority takes over as master and begins forwarding packets.

To minimize network traffic, VRRP is designed in such a way that only

the router that is acting as the master sends out VRRP advertisements at

any given point in time. The backup routers do not send any advertisement

until they take over mastership.

Figure 34 on page 652

illustrates a basic VRRP topology for IPv4 family. In this example,

Routers A, B, and C are running VRRP and together they make up a virtual router. The IP

address of this virtual router is 10.10.0.1 (the same address as the physical interface of

Figure 34: Basic VRRP for IPv4 Family

Because the virtual router uses the IP address of the physical interface of Router A, Router

A is the master VRRP router, while Routers B and C function as backup VRRP routers.

Clients 1 through 3 are configured with the default gateway IP address of 10.10.0.1. As the

master router, Router A forwards packets sent to its IP address. If the master virtual router

fails, the backup router configured with the higher priority becomes the master virtual

router and provides uninterrupted service for the LAN hosts. When Router A recovers, it

becomes the master virtual router again.

ACX Series routers support VRRP version 3 for IPv6 addresses.

ACX routers can support up to 64 VRRP group entries. These can be a combination of

IPv4 or IPv6 families. If either of the family (IPv4 or IPv6) is solely configured for VRRP,

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