VRRP(Virtual Router Redundancy Protocol)

HOST1のGatewayを 192.168.5.1 にしておけば、

switch1(vyatta-A)が落ちても問題無く通信できる。

# set interfaces ethernet eth1 vrrp vrrp-group 99
# set interfaces ethernet eth1 vrrp virtual-address 192.168.5.1
# set interfaces ethernet eth1 vrrp preempt true
# set interfaces ethernet eth1 vrrp priority 255

# set interfaces ethernet eth1 vrrp vrrp-group 99
# set interfaces ethernet eth1 vrrp virtual-address 192.168.5.1
# set interfaces ethernet eth1 vrrp preempt true
# set interfaces ethernet eth1 vrrp priority 150

確認

$ sh vrrp summary 
                VRRP    Addr                    Interface Address  VRRP         
Interface       Group   Type    Address         State     Owner    State        
---------       -----   ----    -------         -----     -----    -----           
eth1            99      vip     192.168.5.1     up        no       master