Host-level policies for site selection, Global vs host-level policy, Configuring host-level policies – Brocade Virtual ADX Global Server Load Balancing Guide (Supporting ADX v03.1.00) User Manual
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Brocade Virtual ADX Global Server Load Balancing Guide
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Host-level policies for site selection
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Host-level policies for site selection
Brocade Virtual ADX provides the following support for configuring GSLB policies for specified GSLB
hosts:
•
Configuring GSLB policies and apply them to hosts within GSLB domains
•
Applying the global GSLB policy to all hosts
•
Applying a host-level GSLB policy to one or more hosts
•
Applying the global GSLB policy to some hosts and host-level GSLB policies to other hosts
Global vs host-level policy
The parameters for a host-level GSLB policy are similar to the parameters for the global GSLB
policy. However, not all global GSLB parameters are available at the host level.
You can configure the following GSLB parameters under the global GSLB policy only:
•
Geographic prefix (geo-prefix command) (see
“Geographic region for a prefix”
•
Static prefix (static-prefix command)
•
Health-status reporting interval (health-status-interval command)
•
GSLB protocol update interval (protocol status-interval command)
Some of the DNS parameters are not configurable in the host-level GSLB policy. These parameters
include:
•
dns cache-proxy – Enables the Brocade Virtual ADX to act as a proxy for a DNS server, by
responding directly to the client queries without forwarding them to the DNS server
•
dns check-interval – Changes the refresh interval for DNS queries to refresh verify zone and
host information. The GSLB Brocade Virtual ADX sends the queries to the DNS for which it is
configured to be a proxy.
•
dns cname-detect – Enables the Brocade Virtual ADX to apply GSLB to CNAME records.
•
dns override – Replaces the IP address in the DNS reply with the IP address you configure for
the proxy server.
•
dns transparent-intercept – Enables the DNS transparent intercept feature.
The GSLB Brocade Virtual ADX will use these DNS parameters from the global GSLB policy for the
host-level GSLB policy.
Configuring host-level policies
Host-level GSLB policies provide finer granularity in specifying the GSLB metrics, related
parameters, and the metric order, by applying them at the host level.
To configure a host-level GSLB policy, complete the following tasks.
1. Define a name for the host-level GSLB policy. Refer to
“Defining a name for a host-level GSLB
2. Configure the parameters for the policy. Refer to
“Configuring the parameters for the host-level
3. Apply the policy to a host or multiple hosts. Refer to