Managing Stacks › Display Device Links

Display Device Links

If you are unable to get any connections through the TCP/IP network or through a particular interface to the TCP/IP network, you may want to check the device links in an attempt to isolate the cause of the problem.

To display device links

1. Enter DL (Display Device Links) next to a stack on the IP Resource Monitor.

   The TCP/IP Device Links List appears.

Device Links Graphic Display

The TCP/IP : Device Links graphic display is organized in the following layers:

• TCP/IP stack
• Devices
• Links and interfaces

TCP/IP Stack Layer

The first layer represents the TCP/IP software running on this system.

Device Layer

The second layer represents the devices used by TCP/IP to interface to the TCP/IP network. Each box in this layer contains information like the following for a device:

• Device name
• Channel protocol type (for example, LCS, CLAW, or CTC)
• Device status
• Channel address
• Channel path status (ONLINE or OFFLINE)
• An error message if applicable
• Send queue size
• MAC address of the device
• Number of packets received
• Number of packets sent

Note: The information varies, depending on the type of device.

If the error message PATH ERROR or CHP ERROR appears for a device, there is an error in the path or the channel path. To investigate this error, use the operating system command: D M=DEV(devAddress).

If the error message ERROR STATUS appears for a device, there is a configuration error.

Note: To investigate this error, see the installation chapter in the Installation Guide for CA TCPaccess CS.

If the device is running in 3172 offload mode, the word offload appears.

SNA link devices display an LU name.

Link and Interface Layer

The third layer represents the links and interfaces that a stack uses to interface to the TCP/IP network. Each box in this layer includes the following details (if applicable) for each link:

• Link name
• Status
• IP address
• Network address
• Network mask
• Subnet address
• Subnet mask
• Maximum Transmission Unit (MTU) size
• Number of packets that are received per hour and number of packets that are sent per hour

  Note: This information is available only if monitoring of the network interface for the stack is set as active in its definition. For more information, see the Implementation Guide.

Display Device Links Graphically

To view a graphic display of the TCP/IP interfaces

1. Press F4 (GrphDisp) at the TCP/IP Device Links List.

   The TCP/IP : Device Links panel appears.

   Note: Alternatively, you can enter DG beside a stack name on the IP Resource Monitor.

Display Device Links Information

From the Device Links List panel, you can find out the following information about an interface of link:

• Which applications are using the interface or link
• Traffic statistics

For an interface or link of the VIPADefine type, you can find out about the VIPA status in the sysplex. If the VIPA is a sysplex distributor, the information includes connection statistics and weighting.

You can also find out the routes involving an interface or link.

To display device links information from Device Links List, enter an action code next to the interface or link, for example:

• Enter S (Show Information) next to the interface or link for which you want to display information.

  The device links information appears.

• Enter R next to an interface or link.

  The Routing Table List appears listing the paths on that interface or link.