Configuring the Software

Setting a Multicast Connection

The LightStream 100 can perform multicasting through SVCs or PVCs. If PVCs are to be used, you must establish a multicast (point-to-multipoint) connection using the pvc establish command, and then pvc add command.

Use the pvc establish command to set the connection type to multicast; then, use the pvc add command to add the endpoint. Enter the same low parameters (line, VPI, and VCI) as those specified in the pvc establish command. The system accepts only multicast connections when the connection is added or when an endpoint is deleted.

When deleting the multicast connection, delete the endpoints one by one. (The deletion order need not be the same as the setup order.) Then delete the unidirectional, point-to-point connection.

To set a multicast PVC and to add two additional endpoints, follow these steps:

Step 1 Enter the enable command to enter privileged command mode.

Step 2 Enter the pvc establish command to establish a PVC connection.

Step 3 Enter the pvc add command on one endpoint.

Step 4 Enter the pvc add command on another endpoint.

Step 5 Enter the show pvc command to display PVC data.

Step 6 Enter the save command to save your changes to Flash ROM.

Step 7 Enter the exit command to return to user command mode.

If a registered endpoint is set incorrectly or requires a change, first delete the endpoint; then add another endpoint.

To delete a multicast connection, first delete all registered endpoints; then delete the multicast PVC connection.

To delete or change an endpoint or to delete a multicast PVC connection, follow these steps:

Step 1 Enter the enable command to enter privileged command mode.

Step 2 Enter the show pvc command to display PVC data.

Step 3 Enter the pvc remote command

Step 4 Enter the pvc add command

Step 5 Enter the show pvc command to verify your changes.

Step 6 Enter the pvc remove command to delete a multicast connection or endpoints.

Step 7 Enter the save command to save your changes to Flash ROM.

Step 8 Enter the exit command to return to user command mode.

Setting and Changing SVCs

To set up a SVC, follow these steps:

Step 1 Enter the enable command to enter privileged command mode.

Step 2 Enter the route add command to establish the SVC routing table.

Step 3 Enter the show route command to verify that the SVC routing table is established.

Step 4 Enter the save command to save your changes to Flash ROM.

Step 5 Enter the exit command to return to user command mode.

To change a registered SVC, first delete the SVC; then add a new one. To delete all registered SVCs, use the route flush command.

To delete one SVC route or an entire SVC routing table, follow these steps:

Step 1 Enter the enable command to enter privileged command mode.

Step 2 Enter the route delete command to delete a single SVC route, or enter the route flush command to delete and entire SVC routing table.

Step 3 Enter the show route command to verify that all desired SVCs are deleted.

Step 4 Enter the save command to save your changes to Flash ROM.

Step 5 Enter the exit command to return to user command mode.

Setting Up SVC Tunneling

To enable the use of standards-based signaling over public carriers, the LightStream 100 switch supports switched virtual circuit (SVC) tunneling. SVC tunneling allows you to set up temporary SVCs over previously established permanent virtual paths (PVPs).

Figure 5-2 shows a simple network composed of two ATM hosts and two ATM switches.

Figure 5-2 : SVC Tunneling

One benefit of SVC tunneling is that you need only configure a PVP between the ATM switches connected to the public carrier. Signaling messages between the two ATM switches are then "tunneled" (exchanged) through the PVP over the ATM Forum-recommended virtual circuit five. The PVP appears as a point-to-point link to the two ATM switches. Routing of signaling messages between the two ATM switches over the public carrier is based on ATM Forum standard IISP. Without SVC tunneling, the complete path between the two ATM hosts must be configured as a PVC.

Another benefit of SVC tunneling is that only a single ATM switch port must be connected to the public carrier network. Through a single port, an ATM switch can communicate with multiple ATM switches (that support SVC tunneling) connected to the same public carrier, as shown in Figure 5-3.

Figure 5-3 : Multiple ATM Switches Connected to a Public Carrier

For example, in Figure 5-3, ATM switch A can communicate with ATM switch B and C simultaneously through a single port connected to the public carrier. For this communication to occur, the public carrier provides two PVPs: one PVP (VP1) between ATM switch A and B and another PVP (VP2) between ATM switch A and C.

In general, one PVP is required between two ATM switches connected to the public carrier. Messages are tunneled between the two ATM switches over the assigned PVP. Signaling messages are exchanged over VP 5, where VP is the PVP between the two ATM switches and 5 is the reserved VCI channel (on the VP) allocated by the ATM Forum for signaling.

The LightStream 100 switch supports a maximum of 64 virtual paths.

To set up SVC tunneling, follow these steps:

Step 1 Enter the enable command to enter privileged command mode.

Step 2 Enter the set svcline suspend command on the line on which you want to configure SVC tunneling.

Step 3 Enter the set signaling command to configure a virtual path on the line.

Step 4 Enter the set sscop command to configure a virtual path for the SSCOP protocol.

Step 5 Enter the set atmsig command to configure a virtual path for the Q.2931 protocol.

Step 6 Enter the route add command to add the route.

Step 7 Enter the set svcline resume command to reactivate the port.

Step 8 Enter the save command to save your changes to Flash ROM.

Step 9 Enter the exit command to return to user command mode.