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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Proxy for DNS server

By default, the Brocade Virtual ADX applies the GSLB policy only to zone and application names
that are configured on the Brocade Virtual ADX. Thus, if the Brocade Virtual ADX receives a DNS
reply that contains CNAME records for the requested zone and application, the Brocade Virtual ADX
does not apply the GSLB policy to the CNAME records.

You can enable the Brocade Virtual ADX to search its GSLB database for the zone and application
names in CNAME records. For example, if the Brocade Virtual ADX receives a DNS reply that
contains the CNAME record www.brocade.com, and the zone and application name
"www.brocade.com" have been configured on the Brocade Virtual ADX, the Brocade Virtual ADX will
apply the GSLB policy to the CNAME record.

To enable the Brocade Virtual ADX to apply GSLB to CNAME records, enter the following commands.

Virtual ADX(config)#gslb policy

Virtual ADX(config-gslb-policy)#dns cname-detect

Syntax: [no] dns cname-detect

NOTE

This feature does not apply to cache proxy GSLB or transparent intercept GSLB.

To display the status of CNAME, enter the following command.

The CNAME status is shown in bold type.

Syntax: show gslb policy

Virtual ADX(config-gslb-policy)#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: DISABLE Cache proxy-DNS override respond-active-only: DISABL

E DNS transparent-intercept: DISABLE

DNS cname-detect: ENABLE Modify DNS response TTL: ENABLE

DNS TTL: 10 (sec), DNS check interval: 30 (sec)

Remote SI status update period: 30 (sec)

Remote SI health-status update period: 5 (sec)

Session capacity threshold: 90% Session availability tolerance: 10%

Round trip time tolerance: 10%, round trip time explore percentage: 5%

Round trip time cache prefix: 20, round trip time cache interval: 120 (sec)

Round trip time cache age refresh: DISABLE

Round trip time algorithm selection: USE PASSIVE ONLY

Connection load: DISABLE

Weighted Site Metric: DISABLE Weighted IP Metric: DISABLE

Active Bindings Metric: DISABLE

Weighted selection: DISABLE

persistent hashing rehash disabled: DISABLE

sticky: DISABLE

Order Metric: DISABLE