Configure
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OmniAccess 5740 Unified Services Gateway Web GUI Users Guide
Alcatel-Lucent
VRRP
Virtual Routing Redundancy Protocol (VRRP) eliminates the single point of failure
inherent in the static default routed environment. VRRP supplies a method of
providing nonstop path redundancy and gateway redundancy for an enterprise
network by sharing protocol and Media Access Control (MAC) addresses between
redundant gateways. The protocol consists of a virtual MAC address and a
protocol address that are shared between two gateway routers.
VRRP specifies an election protocol that dynamically assigns responsibility for a
virtual router to one of the VRRP routers on a LAN. The VRRP router controlling
the IP address(es) associated with the virtual router is called the Master. The
Master router provides default gateway functionality for hosts on the LAN. As the
default gateway, the master router forwards the packets received from the hosts
on the LAN or forwards packets received for the hosts on the LAN. The election
process provides dynamic fail-over in the forwarding responsibility should the
Master become unavailable. Any of the virtual router's IP addresses on a LAN can
then be used as the default first hop router by end-hosts. The advantage gained
from using VRRP is a higher availability default path without requiring
configuration of dynamic routing or router discovery protocols on every end-host.
VRRP is an election protocol that dynamically assigns responsibility for one or
more virtual routers to the VRRP routers on a LAN, allowing several routers on a
multiaccess link to utilize the same virtual IP address. A VRRP router is
configured to run the VRRP protocol in conjunction with one or more other routers
attached to a LAN. In a VRRP configuration, one router is elected as the virtual
router master, with the other routers acting as backup in case of the failure of the
virtual router master.
VRRP is intended for use with IPv4 routers only. VRRP packets are sent
encapsulated in IP packets. They are sent to the IPv4 multicast address assigned
to VRRP.
VRRP is supported on Gigabit Ethernet and VLAN interface on the OmniAccess
5740 USG. Maximum of 8 VRRP groups is configurable on an Interface.
Virtual Router Redundancy Protocol Functionality
VRRP enables a group of routers to form a single virtual router to provide
redundancy. The LAN clients can then be configured with the virtual router as their
default gateway. The virtual router, representing a group of routers, is also known
as a VRRP group.
VRRP Interface Tracking
The VRRP Interface Tracking feature extends the capabilities of the VRRP to
allow tracking of specific interfaces within the router that can alter the priority of a
router.
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