Switch 7700 Configuration Guide

202 CHAPTER 10: RELIABILITY
Figure 2 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, 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 using the IP address of this virtual router,
10.100.10.1. Therefore, hosts within the network communicate with the external
network through this virtual router. If a master switch in the virtual group breaks
down, another backup switch functions as the new master switch to continue
serving the host with routing and to avoid interrupting the communication
between the host and the external networks.
Configuring VRRP VRRP configuration tasks are described in the following sections:
■ Adding and Deleting a Virtual IP Address
■ Configuring the Priority of Switches
■ Configuring Preemption and Delay for a Switch
■ Configuring Authentication Type and Authentication Key
■ Configuring the VRRP Timer
■ Configuring a Switch to Track an Interface
Adding and Deleting a
Virtual IP Address
The virtual-router-ID covers the range from 1 to 255. The virtual-address can be an
unused address in the network segment where the virtual router resides, or the IP
address of an interface in the virtual router. If the IP address is for the switch, it can
also be configured. In this case, the switch is called an IP address owner. When
adding the first IP address to a virtual router, the system creates a new virtual
router accordingly. When adding new address to this backup group thereafter, the
system adds it directly to the virtual IP address list.
After the last virtual IP address is removed from the virtual router, the whole virtual
router is also removed.
Network
Actual IP address 10.100.10.2
Master
Actual IP address 10.100.10.3
Backup
Virtual IP address 10.100.10.1Virtual IP address 10.100.10.1 Ethernet
Host 1 Host 2
Host 3
10.100.10.7
10.100.10.8
10.100.10.9