Brocade Communications Systems 12.4.00 manual Enabling dynamic detection

1 GSLB affinity for high availability

Syntax: [no] gslb ha-group<ServerIron ADX-IP-address-1> <ServerIron ADX-IP-address-2>

Enter the IP address of the two Site ServerIron ADXs in a HA group for <ServerIron ADX-IP-address-1>and <ServerIron ADX-IP-address-2>.Currently, you can specify only two Site ServerIron ADXs in a HA group. You can configure as many HA groups as needed, but a Site ServerIron ADX can only be in one HA group at a time.

You can associate the affinity definition for a client (or client LDNS prefix) with either of the ServerIron ADXs in the HA group. GSLB ServerIron ADX automatically uses the affinity definition for both ServerIron ADXs in the HA group.

NOTE

When running a ServerIron ADX with a switch image, the management IP address must be configured before configuring a local site. This is true for configuring for a fresh box or changing an IP address.

ServerIronADX# configure terminal

ServerIronADX(config)# gslb site local

ServerIronADX(config-gslb-site-local)# si 1.1.1.102

ServerIronADX(config-gslb-site-local)# exit

ServerIronADX(config)# gslb site test

ServerIronADX(config-gslb-site-test)# si 1.1.1.9

ServerIronADX(config-gslb-site-test)# exit

ServerIronADX(config)# gslb ha-group 1.1.1.102 1.1.1.9

ServerIronADX(config)# gslb affinity

ServerIronADX(config-gslb-affinity)# prefer 1.1.1.9 for 1.1.1.0/24

ServerIronADX(config-gslb-affinity)# end

In this example, the configured affinity definition is used for ServerIron ADX 1.1.1.102 and ServerIron ADX 1.1.1.9 since they belong to the same GSLB HA group.

Enabling dynamic detection

You can also enable dynamic detection of HA Site ServerIron ADXs on the GSLB ServerIron ADX. If Site ServerIron ADX-1 and Site ServerIron ADX-2 are in high availability configuration and distributed health-checking is enabled between the Site ServerIron ADX and the GSLB ServerIron ADX, then the GSLB ServerIron ADX will be able to dynamically determine that they are an HA pair. However it will be not be able to dynamically detect these ServerIron ADXs as an HA pair, if one of the following occurs:

•One of the Site ServerIron ADXs loses connection to the GSLB ServerIron ADX and does not re-establish connection to the GSLB ServerIron ADX.

•Distributed health checking is not supported or not enabled between the GSLB ServerIron ADX and these Site ServerIron ADXs.

HA groups should be configured and dynamic detection should be configured only as a backup mechanism.

NOTE

Dynamic detection is an optional configuration and is not needed when HA groups are configured.

To enable dynamic detection of HA pairs, complete the following tasks.

158	ServerIron ADX Global Server Load Balancing Guide
	53-1002437-01