Cabletron Systems SSIM-R8-02 Specifikace stáhnout pdf (Strana 277)

Enterasys Xpedition User Reference Manual 257

Load Balancing

You can change the handshake intervals and the number of retries by entering the

following Configure mode commands:

Verifying Extended Content

You can also have the XP verify the content of an application on one or more load

balancing servers. For this type of verification, you specify the following:

• A string that the XP sends to a single server or to the group of load balancing servers.

The string can be a simple HTTP command to get a specific HTML page. Or, it can be

a command to execute a user-defined CGI script that tests the operation of the

application.

• The reply that the application on each server sends back that the XP will use to validate

the content. In the case where a specific HTML page is retrieved, the reply can be a

string that appears on the page, such as “OK.” If a CGI script is executed on the server,

it should return a specific response (for example, “OK”) that the XP can verify.

Note that you can specify this type of verification for a group of load balancing servers or

for a specific server.

Application verification, whether a simple TCP handshake or a user-defined action-

response check, involves opening and closing a connection to a load balancing server.

Some applications require specific commands for proper closure of the connection. For

example, a connection to an SMTP server application should be closed with the “quit”

command. You can configure the XP to send a specific string to close a connection on a

server.

Set handshake interval for all

servers in specified group.

load-balance set group-options <group name> app-int

Set handshake interval for

specified server.

load-balance set server-options <group name> app-int

Set number of handshake retries

for all servers in specified group.

load-balance set group-options <group name> app-tries

Set number of verification retries

for specified server.

load-balance set server-options <group name> app-tries

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Cabletron Systems SSIM-R8-02 Specifikace Strana 277