Brocade Virtual ADX Server Load Balancing Guide (Supporting ADX v03.1.00) - Manual (Page 113)

Brocade Virtual ADX Server Load Balancing Guide 97
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Policy-based SLB
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• When a request from a different address is received, because it does not have an entry in the
policy list, it is forwarded to one of the load-balanced real servers in the default server group,
which is specified as group 3.
NOTES:
• Policy-based SLB is enabled for individual ports on virtual servers.
• Because policy-based SLB is enabled on a per-VIP basis, some VIPs configured on the
Brocade Virtual ADX can have policy-based SLB enabled, while others do not.
• Policy-based SLB can exist on a standalone device or in a Hot Standby high-availability
configuration.
• Policy-based SLB cannot coexist on the same VIP with Layer 7 switching features,
including URL switching and cookie switching.
Configuring a policy list
A policy list can be created in two ways depending on the number of policies being defined:
• If the number of policies is small, you can create the policy list file using the CLI. Refer to
“Creating the policy list using the CLI.”
• If the number of policies is large, you can download the policy list file from a TFTP server. Refer
to
“Creating the policy list file to dynamically download from a TFTP server.”
Creating the policy list using the CLI
The following command can be used to add policies.
Virtual ADX(config)#server pbslb add 10.10.10.10 1
Syntax: server pbslb add ipv4-addr {prefix | netmask [server-group-id]
The ipv4-addr variable can be a complete host address, or a network address followed by IPv4
mask bits. You must specify either a prefix or a netmask.
The server-group-id variable is alphanumeric and refers to one of the real server groups configured
on the Brocade Virtual ADX.
For the example shown in “Policy-based SLB configuration” on page 96, the policies can be added
as shown in the following.
Virtual ADX(config)#server pbslb add 10.10.10.10 1
Virtual ADX(config)#server pbslb add 20.20.0.0/16 2
Creating the policy list file to dynamically download from a TFTP server
To dynamically download a policy list file from a TFTP server, it must be a flat ASCII text file that
consists of one or more policy-based SLB entries configured in the following format.
ip-addr [network-mask] [server-group-id]
The ip-addr variable can be a complete host address, or a network address followed by IP mask
bits.
The server-group-id variable is alphanumeric and refers to one of the real server groups configured
on the Brocade Virtual ADX.