3Com Switch 8800 Configuration Guide Chapter 41 VRRP Configuration
41-2
Ethernet
Master
Host 1 Host 2 Host 3
10.100.10.7 10.100.10.8 10.100.10.9
Virtual IP address10.100.10.1
Network
Backup
Virtual IP address10.100.10.1
Actual IP address10.100.10.2 Actual IP address10.100.10.3
Figure 41-2 Network diagram for virtual router
This virtual router has its own IP address: 10.100.10.1 (which can be the interface
address of a switch within the virtual router). The switches within the virtual router have
their own IP addresses (such as 10.100.10.2 for the Master switch and 10.100.10.3 for
the Backup switch). The host on the LAN only knows the IP address of this virtual router
10.100.10.1 (usually called as virtual IP address of virtual router), but not the specific IP
addresses 10.100.10.2 of the Master switch and 10.100.10.3 of the Backup switch.
They configure their own default routes as the IP address of this virtual router:
10.100.10.1. Therefore, hosts within the network will communicate with the external
network through this virtual router. If a Master switch in the virtual group breaks down,
another Backup switch will function as the new Master switch to continue serving the
host with routing to avoid interrupting the communication between the host and the
external networks.
41.2 Configuring VRRP The following sections describe the VRRP configuration tasks:
z Enabling/Disabling the Function to Ping the Virtual IP Address
z Enabling/Disabling the Check of TTL Value of VRRP Packet
z Setting Correspondence Between Virtual IP Address and MAC Address
z Adding/Deleting a Virtual IP Address
z Configuring the Priority of Switches in the Virtual Router
z Configuring Preemption and Delay for a Switch Within a Virtual Router
z Configuring Authentication Type and Authentication Key
z Configuring Virtual Router Timer
z Configuring Switch to Track a Specified Interface