Introduction To Vrrp - 3Com Switch 4800G 24-Port Configuration Manual

87

Introduction to VRRP

VRRP Overview
VRRP C
When configuring VRRP, go to these sections for information you are interested in:
"Introduction to VRRP" on page 1073
■
"Configuring VRRP for IPv4" on page 1081
■
"Configuring VRRP for IPv6" on page 1084
■
"IPv4-Based VRRP Configuration Examples" on page 1088
■
"IPv6-Based VRRP Configuration Examples" on page 1096
■
"Troubleshooting VRRP" on page 1105
■
n
At present, the interfaces that VRRP involves can only be VLAN interfaces unless
otherwise specified.
Normally, as shown in Figure 318, you can configure a default route with the
gateway as the next hop for every host on a network segment, allowing all
packets destined to the other network segments to be sent over the default route
to the gateway and then be forwarded by the gateway. This enables hosts on a
network segment to communicate with external networks. However, when the
gateway fails, all the hosts using the gateway as the default next-hop switch fail to
communicate with the external network.
Figure 318 LAN networking
Host A
Host B
Host C
ONFIGURATION
Network
Gateway