Examples Of Vrrp Topologies - Juniper JUNOS OS 10.3 - SOFTWARE Manual

Complete Software Guide for Junos

Examples of VRRP Topologies

1672
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OS for EX Series Ethernet Switches, Release 10.3
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 42 on page 1673.
Switches running VRRP dynamically elect master and backup routing platforms. You
can also force assignment of master and backup routing platforms using priorities from
through , with being the highest priority. In VRRP operation, the default master
1 255 255
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 41 on page 1672 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 41: Basic VRRP on EX Series Switches
Figure 42 on page 1673 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.
10.10.0.1 (the same
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