Vrrp Introduction; Vrrp Overview; Vrrp Features Supported By The Ne80E/40E - Huawei NetEngine80E Configuration Manual - Reliability

HUAWEI NetEngine80E/40E Router
Configuration Guide - Reliability

4.1 VRRP Introduction

VRRP, a fault-tolerant technology, implements routing among multiple egress gateways by
separating physical devices from logical devices.

4.1.1 VRRP Overview

The Virtual Router Redundancy Protocol (VRRP) groups multiple routers into one virtual router,
and sets the default gateway address as the IP address of the virtual router.
All hosts on a network are configured with the same default route to an egress gateway. These
hosts send all packets whose destination addresses are not on the local network segment to the
default egress gateway, such as Router A in
hosts and external networks to communicate. If the egress gateway is Down, all hosts using this
gateway fail to communicate with external networks.
Figure 4-1 LAN default gateway
IP Address:10.0.0.2/24
IP Address:10.0.0.3/24
IP Address:10.0.0.4/24
A common method to improve the system reliability is to deploy multiple egress gateways. In
addition, a mechanism for selecting one of routes to these gateways is required.
VRRP is a fault-tolerant protocol defined in RFC 3768. VRRP allows the hosts to select one of
routes to multiple egress gateways by separating logical devices from physical devices.
On a LAN (for example, an Ethernet) with multicast and broadcast capabilities, VRRP uses
logical gateways to provide high availability for transmission links, preventing a gateway failure
from interrupting services, without changing the configuration of routing protocols.

4.1.2 VRRP Features Supported by the NE80E/40E

VRRP features include the VRRP backup group in master/backup mode, VRRP backup group
in load balancing mode, tracking of the interface status, fast VRRP switchover, ping of the virtual
IP address, VRRP security authentication, smooth VRRP switching, and Management Virtual
Router Redundancy Protocol (mVRRP).
Master/Backup Mode
In VRRP, it is the basic mode for the backup of IP addresses. In the master/backup mode, a
VRRP backup group consists of a master router and multiple backup routers. Different routers
Issue 02 (2011-09-10)
Gateway:10.0.0.1
Gateway:10.0.0.1
Gateway:10.0.0.1
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Figure 4-1. The default egress gateway allows the
10.0.0.1/24
RouterA
Ethernet
4 VRRP Configuration
Network
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