ServerIron ADX Server Load Balancing Guide

Release 12.0.00

June 15, 2009

Auto Download of PBSLB List

Policy Based Load Balancing (PBSLB) Auto Download allows you to automatically download a list of policies to the ServerIron at a scheduled interval or a specific time of day. This automation precludes the need to write scripts and cron jobs. Using PSLB Auto Download, you can regularly upload an updated PBSLB list to the ServerIron on a pre-determined schedule.

NOTE: The server pbslb tftp command must be configured before the server pbslb time-of-day or server pbslb download-interval command, so the ServerIron ADX knows which server and file name to use in the download.

NOTE: The PBSLB time-of-day granularity is in minutes, so seconds are ignored in the configuration. For example, if you enter time as 16:35:30, it is taken as 16:35:00.

Configuring PBSLB Download-Interval

To configure the ServerIron ADX to download a PBSLB list at a periodic interval, use commands similar to the following:

ServerIronADX(config)# server pbslb tftp 10.10.1.101 iplist.txt 2
ServerIronADX(config)# server pbslb download-interval 20

Syntax: server pbslb download-interval <interval in minutes>

In this example, the ServerIron downloads the list in iplist.txt from server 10.10.1.101 once every 20 minutes. If it encounters an error, it retries 2 times.

Configuring PBSLB Time-of-Day

To configure the ServerIron to download a PBSLB list at a specified time, use commands similar to the following:

NOTE: The SNTP clock must be set for this command to work.

ServerIronADX(config)# server pbslb tftp 10.10.1.101 iplist.txt 2
ServerIronADX(config)# server pbslb time-of-day 15:30:00 16:00:00

Syntax: server pbslb time-of-day <time in hh:mm:ss>

In this example, the ServerIron ADX downloads the PBSLB list at 3:30 pm and 4:00 pm every day until the command is reset. You can configure a maximum of 5 time-of-day parameters.

PBSLB Syslog Messages

Messages similar to the following appear whenever autodownload PBSLB is executed.

Aug 15 21:23:59:I:PBSLB config file 5mil-2.txt downloaded from TFTP server 172.20.1.6 -->

this line indicates success

Aug 16 13:30:03:A:FAILED to download PBSLB config file 5mil-2.txt from TFTP server 172.20.1.6 -->

this line indicates failure

Aug 16 14:20:59:W:RETRY download of PBSLB config file 5mil-2.txt from TFTP server 172.20.1.6 -->

this line indicates retry