Brocade Communications Systems 12.4.00 manual DNS cache proxy, Show gslb dns detail

							DNS cache proxy		1
*	1.1.1.16: cfg	real-ip ACTIVE		TCP	5	APP	Count (%)
				N-AM		17	0	(0%)
*	1.1.1.108: cfg	v-ip	ACTIVE	N-AM	0	0	5	(100%)

show gslb dns detail

Use this command to display the affinity group associated with the domain and the number of selections based on affinity.

Syntax: show gslb dns detail [<zone-name>]

ServerIronADX# show gslb dns detail

ZONE: foo.com
HOST: www:
(Global GSLB policy)
GSLB affinity group: 7			Flashback		DNS resp.
			delay		selection
			(x100us)		counters
*	1.1.1.16: cfg real-ip ACTIVE N-AM		TCP	APP	Count (%)
			5	15	0 (0%)
*	1.1.1.108: cfg v-ip	ACTIVE N-AM	0	0	5 (100%)

Active Bindings: 1

site: local, weight: 0, SI: 1.1.1.102

session util: 0%, avail. sessions: 1999996

preference: 128

Metric counter (count [selection-metric]): No metric count yet

Affinity selection count = 5

Debug command

Use the following command to enable debugging for domain-level affinity.

ServerIronADX(config)# gslb trace 10

Syntax: gslb trace [<decimal> <help>]

DNS cache proxy

The DNS cache proxy feature allows the ServerIron ADX to act as a proxy for a DNS server by responding directly to the client queries without forwarding them to the DNS server. Just as in the GSLB DNS proxy mode, the ServerIron ADX periodically queries the authoritative DNS server for IP addresses corresponding to the domains configured for GSLB and caches them. However, unlike GSLB DNS proxy, the ServerIron ADX does not forward every client query to the authoritative DNS server, it responds directly to the client using the cached address list for the requested domain.

When you enable DNS cache proxy, the ServerIron ADX applies the GSLB policy to the IP addresses it has cached for the requested domain, and responds to the client with the best address. The ServerIron ADX refreshes the address cache by periodically querying the authoritative DNS server. The default update interval is 30 seconds and is configurable.

The DNS cache proxy feature is useful in network environments where the traffic between the ServerIron ADX and the authoritative DNS server introduces noticeable latency in the response to client requests. For example, if the ServerIron ADX and the authoritative DNS server are connected over the Internet, this feature can eliminate the delays caused by that connection.

ServerIron ADX Global Server Load Balancing Guide	91
53-1002437-01