START LISTENER (start a channel listener)

Using MQSC commands

For information on how you use MQSC commands, see Performing local administration tasks using MQSC commands.

IBM MQ for z/OS

START LISTENER

Notes:

• ¹ Valid only on z/OS when the queue manager is a member of a queue sharing group.

IBM MQ on other platforms

START LISTENER

Usage notes

1. On z/OS:
   1. The command server and the channel initiator must be running.
   2. If IPADDR is not specified, the listener listens on all available IPv4 and IPv6 addresses.
   3. For TCP/IP, it is possible to listen on multiple addresses and port combinations.
   4. For each START LISTENER for TCP/IP request, the address and port combination is added to the list of combinations upon which the listener is currently listening.
   5. A START LISTENER for TCP/IP request fails if it specifies the same, or a subset or superset of an existing, combination of addresses and ports upon which a TCP/IP listener is currently listening.
   6. If you are starting a listener on a specific address to provide a secure interface with a security product, for example a firewall, it is important to ensure there is no linkage to the other non-secure interfaces in the system.

      You should disable IP forwarding and routing from other non-secure interfaces so that packets arriving at the other interface do not get passed to this specific address.

      Consult the appropriate TCP/IP documentation for information on how to do this.

2. On Multiplatforms, this command is valid only for channels for which the transmission protocol (TRPTYPE) is TCP.

Parameter descriptions for START LISTENER

( name )

Name of the listener to be started. If you specify this parameter, you cannot specify any other parameters.

If you do not specify a name (on platforms other than z/OS ), the SYSTEM.DEFAULT.LISTENER.TCP is started.

This parameter is not valid on z/OS.

CMDSCOPE

This parameter applies to z/OS only and specifies how the command runs when the queue manager is a member of a queue sharing group.

' '

The command runs on the queue manager on which it was entered. This is the default value.

qmgr-name

The command runs on the queue manager you specify, providing the queue manager is active within the queue sharing group.

You can specify a queue manager name, other than the queue manager on which the command was entered, only if you are using a queue sharing group environment and if the command server is enabled.

INDISP

Specifies the disposition of the inbound transmissions that are to be handled. The possible values are:

QMGR

Listen for transmissions directed to the queue manager. This is the default.

GROUP

Listen for transmissions directed to the queue sharing group. This is allowed only if there is a shared queue manager environment.

This parameter is valid only on z/OS.

IPADDR

IP address for TCP/IP specified in IPv4 dotted decimal, IPv6 hexadecimal notation, or alphanumeric form. This is valid only if the transmission protocol (TRPTYPE) is TCP/IP.

This parameter is valid only on z/OS.

LUNAME( string )

The symbolic destination name for the logical unit as specified in the APPC side information data set. (This must be the same LU that was specified for the queue manager, using the LUNAME parameter of the ALTER QMGR command.)

This parameter is valid only for channels with a transmission protocol (TRPTYPE) of LU 6.2. A START LISTENER command that specifies TRPTYPE(LU62) must also specify the LUNAME parameter.

This parameter is valid only on z/OS.

PORT( port-number )

Port number for TCP. This is valid only if the transmission protocol (TRPTYPE) is TCP.

This parameter is valid only on z/OS.

TRPTYPE

Transport type to be used. This is optional.

TCP

TCP. This is the default if TRPTYPE is not specified.

LU62

SNA LU 6.2.

This parameter is valid only on z/OS.

IGNSTATE

Specifies whether the command fails if the listener is already running. The possible values are:

NO

The command fails if the listener is already running. This is the default value.

YES

The command succeeds regardless of the current state of the listener.