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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DNS cache proxy
1
•
Number of DNS queries the GSLB Brocade Virtual ADX has responded to using the DNS cache
proxy feature instead of forwarding the queries to the DNS server. (See the Direct response
field under “DNS cache proxy stat:” in the output.)
The following statistics are displayed for transparent DNS query intercept:
•
Number of queries the Brocade Virtual ADX has redirected to a proxy DNS server or another
ADX device. (See the Redirect field under “DNS query intercept stat:” in the output.)
•
Number of queries to which the Brocade Virtual ADX has directly responded using a
transparent DNS query intercept IP address configured on the Brocade Virtual ADX itself. (See
the Direct response field under “DNS query intercept stat:” in the output.)
NOTE
The counter displayed from the show gslb global-stat command are maintained differently on the
Management and BP consoles. On the Management console the counts are aggregated from all
BPs. On the BP console, the count displayed is only for the BP being accessed.
To display DNS cache proxy statistics, enter the following command at any level of the CLI.
Syntax: show gslb global-stat
The Direct response field, under “DNS cache proxy stat”, lists how many DNS queries the GSLB
Brocade Virtual ADX has responded to using the DNS cache proxy feature instead of forwarding the
queries to the DNS server. In this example, the GSLB Brocade Virtual ADX has responded directly to
client queries ten times with the best site address among those cached on the Brocade Virtual ADX
itself, instead of forwarding the request to the DNS server.
For information about the statistics in the DNS query intercept stat section, refer to
transparent DNS query intercept statistics”
Combining the DNS cache proxy and DNS override features
When the DNS cache proxy feature is enabled, the GSLB Brocade Virtual ADX has to query the
authoritative DNS server at regular intervals, to refresh the IP address list for each domain
configured for GSLB. You can eliminate the need for a backend DNS server, by combining the cache
proxy feature with the DNS override feature.
Virtual ADX#show gslb global-stat
DNS proxy statistics:
TCP response = 0 UDP response = 0
Query type A = 0 Query type ANY = 0
DNSSEC response = 0
DNS cache proxy stat:
Direct response = 0 Query type ANY = 0
Query type A = 0 Query type AAAA = 0
DNS query intercept stat:
Redirect = 0 Direct response = 0
Unsupported query types stat:
Error handling cnt = 0