HP 6125XLG R2306-HP 6125XLG Blade Switch High Availability Configuration Guide - Page 111
Configuring BFD for a VRRP backup to monitor the master, Network requirements, Configuration procedure
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Configuring BFD for a VRRP backup to monitor the master Network requirements • As shown in Figure 28, 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 correctly, 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 the master in a VRRP group fails and BFD is not configured, the backup cannot become the master until the configured timeout timer expires. The timeout is usually 3 to 4 seconds, which is a long delay for most applications. 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 28 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 them. Configure the IP address of each VLAN interface as shown in Figure 28. (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. [SwitchA-Vlan-interface2] vrrp vrid 1 virtual-ip 192.168.0.10 [SwitchA-Vlan-interface2] vrrp vrid 1 priority 110 [SwitchA-Vlan-interface2] return 106
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