Brocade Communications Systems 12.4.00 Weighted distribution of sites with hash-based persistence

1 Weighted distribution of sites with hash-based persistence

SLB-ServerIronADX#show gslb dns detail
ZONE: gslb.com
HOST: www:
(Global GSLB policy)
					Flashback		DNS resp.
					delay		selection
					(x100us)		counters
	SLB-ServerIronADX#show gslb dns detail					APP	Count (%)
					TCP
*	100.1.1.163: dns v-ip		ACTIVE N-AM		0	0	7 (100%)
	ZONE: gslb.com
		Active Bindings: 1
	HOST: www:
		site: local, weight: 0, SI: 100.1.1.2
	(Global GSLB policy)
		session util: 0%, avail. sessions: 5999865							DNS resp
		preference: 128				Flashback
						delay			selectio
		Metric counter (count [selection-metric]):							counters
		Not selected yet				(x100us)
						TCP	APP		Count (%
	*	persistent hash selection count = 7					0	0	7 (100%)
		100.1.1.163: dns v-ip		ACTIVE N-AM

Active Bindings: 1

site: local, weight: 0, SI: 100.1.1.2

In the previous screen shot, the field "persistent hash selection count =7" means IP 100.1.1.163 had been selected 7 times in result of a match in the hash persistent policy.

To display the hash table for a domain for which hash-based persistence is enabled, enter the following command on the BP.

SLB-ServerIronADX2/2# show gslb phash table zone-name gslb.com host-name www

It displays the hash index, associated domain IP, and hit count for each hash entry.

Syntax: show gslb phash table zone-name <name> host-name <name>

Weighted distribution of sites with hash-based persistence

This section contains the following subsections:

•“Overview of distribution of sites with hash-based persistence” on page 76

•“Configuring distribution of sites with hash-based persistence” on page 79

Overview of distribution of sites with hash-based persistence

This section contains the following sub-sections:

•“GSLB hash-based persistence” on page 77

•“GSLB weighted hash-based persistence” on page 77

•“Hashing scheme” on page 77

•“IP address allocation” on page 77

•“IP address failure or removal from domain” on page 78

•“Rehashing for new IP address for a domain or state change from down to up” on page 78

•“Rehash: change in hash weight” on page 79

•“Disabling rehash on introduction of new IP addresses or state change from down to healthy” on page 79

76	ServerIron ADX Global Server Load Balancing Guide
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