SLB Backup Policy

slb real http "server1" 192.168.1.1 80 1000 tcp 3 3
slb real http "server2" 192.168.1.2 80 1000 tcp 3 3
slb real http "server3" 192.168.1.3 80 1000 tcp 3 3

slb group method "group1" rr
slb group member "group1" "server1" 1
slb group member "group1" "server2" 1
slb group member "group1" "server3" 1

slb virtual https "vip1" 10.1.150.100 443
slb policy default "vip1" "group1"

ssl host virtual "www.website1.com" "vip1"

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To create a backup SLB group for the vip1:
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slb real http "s1_backup" 192.168.1.21 1000 tcp 3 3

slb group method "g1_backup" rr
slb group member "g1_backup" "s1_backup"

slb policy backup "vip1" "g1_backup"