Real Server Group Configuration Page Options

  1. Select Configure>SLB>Real Server Group.

    The Real Server Group configuration page appears. Table 38 explains the contents of this page.

  2. Click one:
    • Add—Adds a new or duplicate real server group configuration. Enter information as specified in Table 39.
    • Edit—Edits a selected real server group configuration.
    • Delete—Deletes the selected real server group configuration.
  3. Click one:
    • OK—Saves the configuration and returns to the main configuration page.
    • Commit Options>Commit—Commits the configuration and returns to the main configuration page.
    • Cancel—Cancels your entries and returns to the main configuration page.

Table 38: Real Server Group Configuration Page

Field

Function

Real Server Group List

Group Name

Displays the name of the real server group.

Algorithm

Displays the load balancing algorithm to be used by server load balancing (SLB) as it determines which real servers in the real server group are to be assigned client requests.

  • client-ip-hash—SLB selects a real server, based on simple client IP hash, enabling the same real server to be selected for the same client. This simple client IP hash algorithm uses the hash table to choose a corresponding real server.
  • least-connections—SLB selects a real server, based on the number of active connections that SLB has to each of the operational servers. This algorithm looks up the number of connections in the real server table. It sends the client request to the server with the least connections.
  • round-robin—SLB reads the list of real servers sequentially for each new session, sending client requests to the servers in order, and returning to the top of the list when it reaches the end of the list.
  • weighted-client-ip-hash—SLB takes the weight assigned to each real server into account as it uses the weighted client IP hash algorithm.
  • weighted-least-connections—SLB takes the weight assigned to each real server into account as it uses the weighted least-connections algorithm.
  • weighted-round-robin—SLB takes the weight assigned to each real server into account as it uses the round-robin algorithm.

Routing Instance

Displays the routing instance for the real server group. The routing instance indicates the virtual router domain to which the real servers in the group belong.

Sticky Rule Timeout

Displays the duration of the stickiness in minutes for the sticky mode (client-ip-match or ssl-sessionid). After the specified amount of time elapses, the sticky entry expires.

Sticky Mode

Displays the sticky mode defined for the real servers in each real server group. Stickiness, or session persistence, ensures that traffic coming from the same client goes to the same real server.

  • client-ip-match—SLB first looks up the client IP sticky table. If there is a real server in the list that matches, SLB selects it. If there is not a match in the table, SLB uses the specified load balancing algorithm to select a real server and saves the real server ID for the client IP.
  • ssl-sessionid—SLB assigns Secure Sockets Layer (SSL) connections that consistently belong to an SSL session to one real server. SSL persistency ensures that an SSL session is resumed after the first full SSL handshake. SLB intercepts the server hello packet and saves the session ID and real server pair to the SSL session sticky table.

Table 39: Add Real Server Group Configuration Details

Field FunctionAction

Group Name

Specifies the name of the real server group.

Enter the real server group name.

Real Server

Specifies the list of configured real servers to be assigned to the group.

Select the servers from the Real Server List. To add the servers to the Selected list, click the Right Arrow.

Algorithm

Specifies the port number of the service that resides on the real server.

Select one of the following options from the list:

  • client-ip-hash
  • least-connections
  • round-robin
  • weighted-client-ip-hash
  • weighted-least-connections
  • weighted-round-robin

Sticky Rule

  

Time Out

Specifies the duration of the stickiness for the sticky mode.

Enter the duration of the stickiness in minutes.

Sticky Mode

Defines the sticky mode for the real servers in each real server group.

Select one of the following options from the list:

  • client-ip-match
  • ssl-sessionid

Routing Instance

Specifies the routing instance for the real server group.

Select a routing instance from the list.

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