Brocade Communications Systems 12.4.00 manual Secure Gslb, Enabling default geographic location

1 Secure GSLB

The <ip-addr>specifies the address of the cache entry. This is not necessarily the address of a remote site. The address you specify here is combined with the prefix length to result in a network prefix (network portion of an IP address). The prefix length can be from 1-31.

NOTE

The prefix length 0 is not applicable to this feature and is ignored by the software.

You can enter more than one prefix on the same command line. Separate each prefix with a space. You can configure up to 250 static prefixes on a ServerIron ADX.

The command in this example configures an entry for address 61.1.1.1 with a prefix of 20 bits. (Due to the prefix length, the value actually stored in the cache is 61.1.0.0.20.) When the GSLB ServerIron ADX receives RTT information for an address within the specified prefix, the GSLB ServerIron ADX stores the information in the static prefix entry configured above, instead of creating a dynamic entry.

Enabling default geographic location

The use-default-locationcommand enables you to ensure that the geographic policy metric is used to load balance client requests even if the client prefix cache maintained by the GSLB ServerIron ADX is full.

By default, the GSLB ServerIron ADX ignores the default location of new client requests if its client prefix cache if full. Whenever the GSLB ServerIron ADX cannot create a new entry in the client prefix cache because it has already exceeded the limit, it ignores the geographic policy metric and falls to the next metric in the GSLB policy.

If the use-default-locationcommand is configured for either the global GSLB policy or the host-level GSLB policy, the ServerIron ADX uses the default location of the client and the geographic policy metric when determining how to distribute the client’s request.

To ensure that the geographic policy metric is used, enter commands such as the following:

ServerIronADX(config)# gslb policy

ServerIronADX(config-gslb-policy)# use-default-location

The default location of the client corresponds to the default location configured on the GSLB controller. If no default location is configured on the GSLB controller, then n-america is assigned by default. For more information, see “Specifying GSLB controller locations” on page 21

Secure GSLB

Secure GSLB uses industry standard algorithms and mechanisms to authenticate and encrypt Global Server Load Balancing (GSLB) protocol communication between the GSLB controller and site ServerIron ADXs.

GSLB controllers and site ServerIron ADXs communicate and exchange information using the GSLB protocol. This protocol comprises a set of messages for exchanging information, and each message type has a unique format.

Secure GSLB communication provides the following benefits:

56	ServerIron ADX Global Server Load Balancing Guide
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