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Chapter 5
Configuring VRRP
VRRP Overview
VRRP Terms
This chapter describes how to configure the Virtual Router Redundancy Protocol
(VRRP) on your E Series router.
VRRP Overview on page 105
Platform Considerations on page 106
References on page 106
How VRRP Works on page 107
How VRRP Is Implemented in E Series Routers on page 110
Configuring VRRP on page 112
Changing Object Priority on page 117
Monitoring VRRP on page 117
VRRP can prevent loss of network connectivity to end hosts if the static default IP
gateway fails. By implementing VRRP, you can designate a number of routers as
backup routers in the event that the default master router fails. VRRP fully supports
Virtual Local Area Networks (VLANs) and stacked VLANs (S-VLANs).
NOTE: The term virtual router as defined in Configuring Virtual Routers in the JUNOSe
System Basics Configuration Guide, is different from what is implied by VRRP. In this
chapter, the term virtual router always refers to a VRRP router; that is, a router that
has enabled VRRP.
In case of a failure, VRRP dynamically shifts the packet-forwarding responsibility to
a backup router. VRRP creates a redundancy scheme that enables hosts to keep a
single IP address for the default gateway but maps the IP address to a well-known
virtual MAC address. VRRP provides this redundancy without user intervention or
additional configuration at the end hosts.
Table 18 on page 106 provides definitions for the basic VRRP terms used in this
chapter.
105
VRRP Overview
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