HP 6125G HP 6125G & 6125G/XG Blade Switches High Availability Configur - Page 200

The output shows that when a fault is on the link between Switch A and Switch C, the priority of Switch A decreases to 80. Switch A becomes the backup, and Switch B becomes the master. Packets from Host A to Host B are forwarded through Switch B. Configuring BFD for a VRRP backup to monitor the master Network requirements • As shown in Figure 50, Switch A and Switch B belong to VRRP group 1, whose virtual IP address is 192.168.0.10. • The default gateway of the hosts in the LAN is 192.168.0.10. When Switch A operates properly, the hosts in the LAN access the external network through Switch A. When Switch A fails, the hosts in the LAN access the external network through Switch B. • If BFD is not configured, when the master in a VRRP group fails, the backup cannot become the master until the configured timeout timer expires. The timeout is generally three to four seconds, which makes the switchover slow. To solve this problem, VRRP uses BFD to probe the state of the master. Once the master fails, the backup can become the new master in milliseconds. Figure 50 Network diagram Internet Switch A Master Vlan-int2 192.168.0.101/24 Virtual router Virtual IP address: 192.168.0.10 Switch B Backup Vlan-int2 192.168.0.102/24 L2 switch BFD probe packets VRRP packets Configuration procedure 1. Create VLANs, and assign corresponding ports to the VLANs. Configure the IP address of each VLAN interface as shown in Figure 50. (Details not shown.) 2. Configure VRRP on Switch A: system-view [SwitchA] interface vlan-interface 2 # Create VRRP group 1, and configure the virtual IP address 192.168.0.10 for the group. Set the priority of Switch A in VRRP group 1 to 110. 193