ServerIron ADX Server Load Balancing Guide
Release 12.0.00
June 15, 2009

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Server Load Balancing > PBSLB Pool Failsafe Group

PBSLB Pool Failsafe Group
This feature allows a ServerIron ADX to direct traffic away from a given server pool to a "default pool" in situations where the servers in the server pool become unavailable.
Overview of PBSLB Pool Failsafe Group
When PBSLB is used to filter traffic based on source IP address, a ServerIron ADX looks up a group id for the client to forward the incoming request to. If all the servers in the group fail, the ServerIron ADX sends a TCP reset to the client, causing the request to fail. This feature allows you to configure a failsafe group, which will be used to forward traffic, in case the group designated for a client source-ip address fails. The following section outlines the behavior of this feature in two scenarios.
For IPs present in the PBSLB list:
For IPs not present in the PBSLB list:
Command Line Interface
There are two steps to enable this feature.
1.
2.
3.
4.
Create a PBSLB failsafe group
To create a PBSLB failsafe group, enter a command such as the following:
ServerIron(config)# server pbslb failsafe-group-id 2
Syntax: [no] server pbslb failsafe-group-id <group-id>
Assign Real Server Ports to a Failsafe Group
A failsafe group can contain one or more real servers. If there is more than one real server in a failsafe group, requests are load balanced across all the servers in the group. To assign real servers to the failsafe group, enter commands such as the following:
ServerIron(config)# server real-name rs1 207.95.7.1
ServerIron(config-rs-rs1)# port http group-id 2 2
ServerIron(config-rs-rs1)# exit
Enable PBSLB on a VIP Port
To enable PBSLB on a vip port,enter commands such as the following:
ServerIron(config)# server virtual-name-or-ip mysite 209.157.22.63
ServerIron(config-vs-mysite)# port http
ServerIron(config-vs-mysite)# port http sw-l4-pbslb
ServerIron(config-vs-mysite)# bind http rs1 http
Show Commmands
To view the number of requests forwarded to the failsafe server group, enter the following command:
ServerIron# show pblsb failsafe
Syntax: show pbslb failsafe
To clear PBSLB fail-safe counter, enter the following command:
ServerIron# clear pbslb failsafe
Syntax: clear pbslb failsafe

Server Load Balancing > PBSLB Pool Failsafe Group

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