Brocade Network OS Administrator’s Guide v4.1.1 - Manual (Page 597)

Configuring VRRP
● VRRP overview............................................................................................................. 597
● Configuring VRRP.........................................................................................................602
VRRP overview
A virtual router is a collection of physical routers that can use the Virtual Router Redundancy Protocol
(VRRP) to provide redundancy to routers within a LAN. Two or more VRRP-configured routers can
create a virtual router.
VRRP eliminates a single point of failure in a static, default-route environment by dynamically assigning
virtual IP routers to participating hosts. The interfaces of all routers in a virtual router must belong to the
same IP subnet. There is no restriction against reusing a virtual router ID (VRID) with a different
address mapping on different LANs.
Basic VRRP topology
The figure below shows a basic VRRP topology to illustrate some basic VRRP concepts. Router 1 and
Router 2 are two physical routers that can be configured to compose one virtual router. This virtual
router provides redundant network access for Host1. If Router 1 were to fail, Router 2 would provide the
default gateway out of the subnet.
FIGURE 66 Basic VRRP topology
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