Examples Of Vrrp Topologies - Juniper JUNOS OS 10.4 - FOR EX REV 1 Manual

Examples of VRRP Topologies

Copyright © 2010, Juniper Networks, Inc.
NOTE: Do not confuse the VRRP master and backup routing platforms with
the master and backup member switches of a Virtual Chassis configuration.
The master and backup members of a Virtual Chassis configuration compose
a single host. In a VRRP topology, one host operates as the master routing
platform and another operates as the backup routing platform, as shown in
Figure 29 on page 1174.
Switches running VRRP dynamically elect master and backup routing platforms. You
can also force assignment of master and backup routing platforms using priorities from
1 through 255 , with 255 being the highest priority. In VRRP operation, the default master
routing platform sends advertisements to backup routing platforms at regular intervals.
The default interval is 1 second. If the backup routing platforms do not receive an
advertisement for a set period, the backup routing platform with the highest priority takes
over as master and begins forwarding packets.
NOTE: Priority 255 cannot be set for routed VLAN interfaces (RVIs).
VRRP is defined in RFC 3768, Virtual Router Redundancy Protocol.
Figure 28 on page 1173 illustrates a basic VRRP topology with EX Series switches. In this
example, Switches A, B, and C are running VRRP and together they make up a virtual
routing platform. The IP address of this virtual routing platform is
address as the physical interface of Switch A).
Figure 28: Basic VRRP on EX Series Switches
Figure 29 on page 1174 illustrates a basic VRRP topology using Virtual Chassis configurations.
Switch A, Switch B, and Switch C are each composed of multiple interconnected Juniper
Networks EX4200 Ethernet Switches. Each Virtual Chassis configuration operates as a
single switch, which is running VRRP, and together they make up a virtual routing platform.
Chapter 50: High Availability—Overview
10.10.0.1 (the same
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