NMC-RX 7.3.x User Guide, Vol. 2 > Configuring Tunnel Connections > Creating SMDS Tunnel Connections

Creating SMDS Tunnel Connections

An SMDS tunnel connection is a network-level object that links two mirrored GRE tunnel interfaces.

Figure 6 shows the SMDS tunnel connection components.

Figure 6: SMDS Tunnel Connection Components

The two tunnel interfaces must identify a locally configured IP address as the source IP address and another IP address as the destination IP address. The source IP address of one GRE tunnel interface is the destination IP address of the other GRE tunnel interface, and vice versa.

To create an SMDS tunnel connection:

1. From the Configuration menu, select Create, and click SMDS Tunnel Connection.

The Create SMDS Tunnel Connection dialog box appears.

2. Type a logical name for the SMDS tunnel connection in the text box. (See Table 51.)
3. Create the tunnel endpoints in either of the following ways:

• Create a new GRE tunnel interface for each endpoint by setting the parameters in each endpoint's group box. See Creating SMDS Tunnel Endpoints.
• Select an existing tunnel interface by clicking the Select Available Tunnel Interface button in the IP Tunnel Interface group box. See Selecting Available IP Tunnel Interfaces.

4. When you finish configuring each endpoint, click OK in the Create SMDS Tunnel Connection dialog box.

The NMC-RX application creates a GRE tunnel connection.

NOTE: The Clear button in the GRE Tunnel Interface group box allows you to reset the parameters to their default values.

Creating SMDS Tunnel Endpoints

This section describes creating the endpoints in an SMDS tunnel connection.

To create the tunnel endpoints:

1. Set the parameters (Table 51).

 Table 51:  SMDS Tunnel Connection Parameters 

 Parameter
 Description

 Logical Name

 Name for the SMDS tunnel connection; maximum of 80 characters.


 Device

 Device identifier. This field is automatically set.


 HSSI Line Interface

 Slot

 Slot of the physical interface to connect to the SMDS switch; default: blank.


 Port

 Port of the physical interface to connect to the SMDS switch.


 If Index

 This field is blank when you create an object and is automatically populated with the If Index identifier when you configure the object; cannot edit.


 GRE Tunnel Interface

 Name

 Name for the GRE tunnel interface; 1-80 characters.


 Mode

 IP tunnel mode for an SMDS tunnel connection; must be GRE; therefore, this field is preselected and disabled; default: GRE.


 If Index

 This field is blank when you create an object and is automatically populated with the If Index identifier when you configure the object; cannot edit.


 MTU

 Maximum transmission unit setting for the GRE tunnel interface; range 1024-10240; default 10240. To ensure effective function, the MTU value should be the same for both endpoints.
 NOTE: The SMDS interface supports a maximum value of 9188.


 IP Checksum

 Checking this box enables end-to-end check summing and causes the system to drop packets with bad checksums received on this interface. Range: enable/disable. Default: disable.


 Source: IP Address

 Source IP address for the GRE tunnel interface.


 Source: Virtual Router

 Transport router associated with the source IP tunnel interface. Once you have created the tunnel interface, you cannot change this parameter.


 Destination IP Address

 Destination IP address for the GRE tunnel interface.



 

2. Select the HSSI line interface.

To do this, in the HSSI Line Interface group box, click Select Interface. The Select Available HSSI Line Interface dialog box appears. When you select a line interface, the HSSI parameters are populated: Slot, Port, and If Index.

 NOTE: A HSSI that is not listed may already be associated with an existing tunnel interface. You may select all the interfaces (HSSI through IP tunnel) for the entire endpoint by clicking the Select Available Tunnel Interface button in the GRE Tunnel Interface group box.



 

Selecting Available GRE Tunnel Interfaces

The Select GRE Tunnel Interface dialog box appears when you click the Select Available Tunnel Interface button in the GRE Tunnel Interface group box. See Selecting Available IP Tunnel Interfaces. The information and procedures are the same for both IP tunnel interfaces and GRE tunnel interfaces.

Create SMDS Tunnel Connection-Related Dialog Boxes

These dialog boxes are used to configure the source IP address and virtual router and the destination IP address for the endpoint. They work the same for both IP tunnel interfaces and GRE tunnel interfaces. See the Related Dialog Boxes.