Parameters

Meaning

Unit

Default Value

wdisp/auto_refresh             

The period of time after which the route information tables of the SAP Web dispatcher (server tables, group tables and URL mapping tables) are periodically updated.

Seconds

120

wdisp/max_servers

This parameter determines the maximum number of entries in the SAP Web dispatcher’s server table.                           

Whole number (between 64 and 4096)

128

wdisp/max_server_name_len      

This parameter specifies the maximum length of an entry in the SAP Web dispatcher’s server table, that is, the maximum length of an instance name (profile parameter rdisp/myname of the individual servers).

Whole number (between 32 and 128)

64

wdisp/max_server_groups        

This parameter determines the maximum number of entries in the SAP Web dispatcher’s group table.

Whole number (between 32 and 4096)

128

wdisp/max_server_group_name_len

This parameter determines the maximum length of an entry in the SAP Web dispatcher’s group table.

You maintain logon groups in transaction SMLG.     

Whole number (between 20 and 64)

20

wdisp/max_url_map_entries      

This parameter determines the maximum number of entries in the SAP Web dispatcher’s URL mapping table.       

Whole number (between 100 and 10000)

300

wdisp/max_url_map_path_len     

This parameter determines the maximum path length in the SAP Web dispatcher’s URL mapping table.                                

Whole number (between 100 and 2048)

256

wdisp/server_info_location

Specifies from where the SAP Web dispatcher obtains information about the SAP Web Application Server, to which it can distribute the Web requests.

The SAP Web Dispatcher gets its information from the Message Server. The parameter indicates the (relative) URL where in the Message Server this information is.

Character string

/msgserver/

text/logon

wdisp/group_info_location

Specifies from where the SAP Web dispatcher obtains information about the server groups, to which it can distribute the Web requests.

The details are indicated in a URL (absolute or relative).

Usually the SAP Web Dispatcher gets its group information from an application server (transaction SMLG). In this case you can specify the ICF service, where the groups are defined.

If there is no message server or application server with ICF (ABAP) available, you can store this information in a file. In this case you can use this parameter to specify the file path by setting the parameter to file://<path>.

Character string

/sap/public/

icf_info/

icr_groups

wdisp/url_map_location

URL under which the SAP Web Dispatcher finds the URL mapping info.

This is usually a path in the HTTP service hierarchy (transaction SICF).

If there is no message server or application server with ICF (ABAP) available, you can store this information in a file. In this case you can use this parameter to specify the file path by setting the parameter to file://<path>.

URL path name

/sap/public/

icf_info/icr/

urlprefix

wdisp/permission_table

Absolute or relative path for URI permission table. Further profile parameters for configuring the URI permission table are described in section SAP Web Dispatcher as URL Filter.

Character string (file path)

Wdisp/HTTPS/dest_logon_group         

This parameter is only relevant when using End-to-End SSL

This parameter determines the logon group for load balancing requests at the SAP Web dispatcher. If a logon group is defined, the requests are passed to the servers in this group only. If no group is defined, the requests can be passed to all of the servers in the system.

You maintain logon groups in transaction SMLG in the system.

Logon group names

wdisp/HTTPS/sticky_mask

This parameter is only relevant when using End-to-End SSL

This parameter describes a bit mask for client IP addresses. The result of the bitwise AND operation on the client’s IP address and the sticky mask is used for load balancing of clients.                   

This way you can summarize groups of client IP addresses.

This functionality is required because large internet providers use several proxies (with different IP addresses) but the clients must be handled in the same way. This is imperative for applications for which the server keeps a status (stateful applications).                                         

Character string

255.255.240.0                                    

The last 12 bits of the client IP address are no longer significant (are not distinguished).                     

wdisp/HTTPS/

max_client_ip_entries

This parameter is only relevant when using End-to-End SSL

This parameter specifies the maximum number of entries in the mapping table between the client IP address and the application server.                                                   

The memory for the mapping table is allocated in the host’s shared memory.                                             

Number of entries (integer value)

50000

wdisp/HTTP/max_pooled_con 

This parameter determines the maximum number of HTTP connections in the connection pool from the SAP Web dispatcher to an SAP Web Application Server.                                                           

You do not normally need to change the default setting.  

Number of connections

32768

wdisp/HTTP/min_pooled_con

Minimum number of HTTP connections that are kept in the SAP Web dispatcher’s connection pool for each application server. This number of connections is kept before the first HTTP request is received.                                       

Number of connections

2

wdisp/HTTPS/max_pooled_con 

This parameter is the same as wdisp/HTTP/max_pooled_con, though for HTTPS connections.

What is important here is the protocol used from the SAP Web dispatcher to the Web AS. See SAP Web Dispatcher and SSL.

You do not normally need to change the default setting.  

Number of connections

32768

wdisp/HTTPS/min_pooled_con

This parameter is the same as wdisp/HTTP/min_pooled_con, though for HTTPS connections.

What is important here is the protocol used from the SAP Web dispatcher to the Web AS. See SAP Web Dispatcher and SSL.

Since for each HTTP connection in the pool on the Web AS, a thread is blocked in the ICM, you should not change the default value of 0!                                                 

Number of connections

0

wdisp/ssl_encrypt

This parameter determines how the SAP Web dispatcher handles inbound HTTP(S) requests. The following values are possible:

0: Forward the request unencrypted.                        

1: Encrypt the request again with SSL, in case the request arrived via HTTPS protocol.                                  

2: Always forward the request encrypted with SSL.        

The parameter corresponds to the SSLENC option of the ICM parameter icm/HTTP/j2ee_<xx> 

You can also configure the SAP Web dispatcher for End-to-End SSL, by specifying the protocol ROUTER when you define the icm/server_port_<xx> parameter.               

Whole number (0, 1 or 2)

0

wdisp/ssl_auth

This parameter determines which X.509 client certificate of the SAP Web dispatcher can be used with which application servers.  

The following values are possible:                                      

0: No certificate

1: Default certificate

2: Use the certificate specified in the wdisp/ssl_cred parameter.                              

The parameter corresponds to the TYPE option of the ICM parameter icm/HTTP/j2ee_<xx> 

Whole number (0, 1 or 2)

0

wdisp/ssl_cred   

Name of the PSE file used for the server authentication. This option is only relevant if wdisp/ssl_auth =2.

The parameter corresponds to the CRED option of the ICM parameter icm/HTTP/j2ee_<xx> 

File name/path name (corresponds to the operating system convention)

wdisp/ssl_certhost

This parameter is only relevant if you have configured the communication with certificates (wdisp/ssl_auth).               

If wdisp/ssl_certhost is not defined, for each application server a server certificate must be set up on the relevant host. In this parameter you can specify a host on which the server certificate is issued. Then you do not have to provide a certificate for each application server.                                  

Your server certificate is issued on the name "www.sap.com". You activate this certificate for all application servers in transaction STRUST. You also set the value of wdisp/ssl_certhost to www.sap.com.

If this parameter is not set, the host names on the message server (transaction SMLG) and the names the certificates are issued with must be the same.                                 

Host name

wdisp/load_balancing_strategy

Load balancing strategy of the SAP Web dispatcher, see Server Selection and Load Balancing Using the SAP Web Dispatcher

Load balancing strategy

Possible values:

weighted_round_robin

simple_weighted_round_robin

weighted_round_robin