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

 

53-1002437-01

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Image 88
Brocade Communications Systems 12.4.00 manual Weighted distribution of sites with hash-based persistence