Brocade Virtual ADX Global Server Load Balancing Guide (Supporting ADX v03.1.00) - Manual (Page 76)

66 Brocade Virtual ADX Global Server Load Balancing Guide
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DNS cache proxy
1
If the GSLB Brocade Virtual ADX cannot respond directly to the client for the requested domain (for
example, because the domain is not configured on the GSLB Brocade Virtual ADX), the Brocade
Virtual ADX sends the request through to the DNS server. This is the same behavior as when the
DNS cache proxy feature is disabled.
NOTE
You can combine the DNS cache proxy feature with the DNS override feature to completely eliminate
the separate DNS server. In this case, the Brocade Virtual ADX contains all the required DNS
information. Refer to
“Combining the DNS cache proxy and DNS override features” on page 67.
Enabling DNS cache proxy
To enable DNS cache proxy, enter the following commands.
Virtual ADX(config)#gslb policy
Virtual ADX(config-gslb-policy)#dns cache-proxy
Syntax: [no] dns cache-proxy
Displaying DNS cache proxy state
To display the current GSLB policy settings, which include the DNS cache proxy state, enter the
following command at any level of the CLI.
Syntax: show gslb policy
The command output shown in bold type in the example indicates the DNS cache proxy state. The
state can be one of the following:
• DISABLE (the default)
• ENABLE
Displaying DNS cache proxy statistics
The GSLB Brocade Virtual ADX maintains statistics for the transparent DNS as well as DNS proxy
mode query intercept and DNS cache proxy features.
The following statistics are displayed for DNS cache proxy:
Virtual ADX(config)#show gslb policy
Default metric order: ENABLE
Metric processing order:
1-Server health check
2-Remote SI's session capacity threshold
3-Round trip time between remote SI and client
4-Geographic location
5-Remote SI's available session capacity
6-Least response selection
DNS active-only: DISABLE DNS best-only: DISABLE DNS override: DISABLE
DNS cache-proxy: ENABLE Cache proxy-DNS override respond-active-only: DISABLE
DNS transparent-intercept: DISABLE
remaining rows omitted for brevity...