EE Connection Timeouts

Enterprise Extender Best Practices › Enterprise Extender Management › EE Connection Timeouts

EE Connection Timeouts

The EE connection terminations are caused by exchange identification (XID) or Logical Data Link Control (LDLC) timeouts.

The LDLC layer monitors the EE connection with the LIVTIME, SRQRETRY, and SRQTIME parameters on the PORT statement. The connection is terminated if no activity or response occurs for a duration (in seconds) approximated by the following expression:

LIVTIME + (SRQRETRY+1) * SRQTIME

LIVTIME: Specifies the amount of inactivity time that can lapse before LDLC tests the connection.
SRQTIME: Specifies the amount of time LDLC waits for a response to its test.
SRQRETRY: Specifies the number of times the test is retried.

The actual duration of the outage detection is plus or minus one SRQTIME interval of the calculated amount.

Some methods to avoid timeouts are:

Lengthen the HPR path switch timers (HPRPST) to ensure that all four timers are longer than the LDLC timeout interval.
Ensure that the values of the LDLC parameters are consistent between the end points of the connection.
For predefined EE PUs, specify DISCNT=NO.

Use CA NetMaster NM for TCP/IP to avoid connection timeouts

From the command entry panel, enter the following command:
```
D VTAMOPTS,OPTION=HPRPST
```
The HPR path switch timers are displayed. The shortest time is typically for the network priority and is 60 seconds.
From the command prompt, enter the following panel shortcut:
```
/EEXCA
```
The EE Major Node Summary is displayed.
Enter S against a specific PU from the connection, and press F4 (Display).
The LIVTIME settings are displayed.

Review message IST2114I for the current LIVTIME setting.
Press (F3) Exit.
The EE Major Node Summary is displayed.
Press F4 (Display).
The ENTERPRISE EXTENDER GENERAL INFORMATION messages are displayed.
Review the message IST2004I to calculate the timeout duration:
```
livtime + (srqretry+1) * srqtime
```