Virtual Router Overview - H3C S7500 Series Operation Manual

Operation Manual – VRRP-HA
H3C S7500 Series Ethernet Switches
VRRP combines a group of LAN switches, including a master switch and several
backup switches, into a virtual router, or a backup group.
Virtual IP address
10.100.10.1
Figure 1-2 Virtual route
The switches in a backup group have the following features:
This virtual router has its own IP address: 10.100.10.1 (which can be the interface
address of a switch within the backup group).
The switches within the backup group have their own IP addresses (such as
10.100.10.2 for the master switch and 10.100.10.3 for the backup switch).
Hosts on the LAN only know the IP address of this virtual router, that is,
10.100.10.1, but not the specific IP addresses 10.100.10.2 of the master switch
and 10.100.10.3 of the backup switch.
Hosts in the LAN use the IP address of the virtual router (that is, 10.100.10.1) as
their default next-hop IP addresses.
Therefore, hosts within the network will communicate with the other networks through
this virtual router.
If the master switch in the backup group goes down, the backup switch with the highest
priority functions as the new master switch to guarantee normal communication
between the hosts and the external networks. This ensures the communications
between the hosts and the external networks.

1.1.1 Virtual Router Overview

After you enable VRRP on the switches of a backup group, a virtual router is formed.
You can perform related configuration on the virtual router.
Network
Actual IP address
10.100.10.2
Master
Ethernet
10.100.10.7
Host 1
r
Actual IP address
10.100.10.3
Ba ckup
Virtual IP address
10.100.10.1
10.100.10.8
Host 2 Host 3
1-2
Chapter 1 VRRP Configuration
10.100.10.9