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This chapter provides information about provisioning Frame Relay services.
Frame Relay is a multiplexing technique that uses dynamic bandwidth allocation and variable-length packets called frames. It is ideal for applications with bursty data traffic that can tolerate variable delay.
Congestion management and class-of-service manage Frame Relay traffic. For each DLCI you can configure class-of-service parameters that guarantee the amount of bandwidth that the constant rate or bursty traffic uses on the DLC, and allow traffic to exceed the guaranteed bandwidth for applications that have bursts greater than the guaranteed bandwidth.
The configurable parameters allow you to set the traffic rate. For Frame Relay there are three configurable class-of-service parameters. They are:
Two non-configurable class-of-service variables are derived from the configurable class-of-service parameters. They are:
The Committed Information Rate (CIR) for a DLC is the rate in Kb/s that the network commits to transfer user payload under normal conditions.
The committed burst (Bc) is the maximum number of bits of user data that the network commits to transfer during the TC at the CIR under normal conditions.
All frames in excess of the Bc are sent with the DE bit set. The DE bit marks frames that can be discarded when congestion has increased past an acceptable level.
The excess burst (Be) is the maximum number of bits in excess of the Bc that the network will attempt to transfer over the Tc under normal conditions.
All frames in excess of the Be are discarded.
Tc is not configurable. It is calculated as Bc/CIR and is the time interval over which you may transfer Bc bits of committed data or Bc+Be bits of uncommitted data.
Maximum burst size is the number of cells that can be received at the peak cell rate. This allows a burst of cells to arrive at a rate higher than the sustainable cell rate. If the burst is larger than anticipated, the additional cells are either tagged or dropped.
You can create Service object profiles for the various types of Frame Relay services. When you use a Service object profile CPC uses the values that you have specified in the profile to create the Service. Profiles provide an easy way to store information about the various types of Frame Relay services that you will be provisioning.
Figure 13-1 shows the Frame Relay Service Profile Object Viewer.
The attributes for which you can provide values in the Frame Relay Service object profile are outlined in the Table 13-1 below.
| Attribute | Description |
|---|---|
SE Profile Name | This is the name of the service element profile for the specific equipment module that is talking to the NMS for the network you are provisioning services across. |
CIR | The rate at which the network commits to transfer information under normal conditions. The rate is averaged over a minimum time interval (Tc). |
Bc | Bc is the maximum number of bits of user data that the network commits to transfer during the Tc at the CIR under normal conditions. |
Be | Be is the maximum number of bits in excess of the committed burst (Bc) that the network will attempt to transfer over the Tc under normal conditions. |
| Attribute | Description | Acceptable Values |
|---|---|---|
SE Profile Name | This is the name of the Service element profile, obtained form the specific equipment module that is talking to the NMS for the network you are provisioning services across. |
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Service Label | Enter a name for the connection. The name can be up to eight characters in length. This field is optional. |
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Recovery Priority | This is the recovery priority for NNI resiliency. | the lower the value, the higher the priority; 0 having infinitely low priority; (default=5) |
UNI Priority | This is the recovery priority for UNI Resiliency. | integer, same as NNI Recovery Priorities (default=5) |
Frame Relay Priority | This is the Frame Relay priority. | High, Medium, Low |
CIR | The rate at which the network commits to transfer information under normal conditions. The rate is averaged over a minimum time interval (Tc). |
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Bc | Bc is the maximum number of bits of user data that the network commits to transfer during the Tc at the CIR under normal conditions. |
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Bc | Be is the maximum number of bits in excess of the committed burst (Bc) that the network will attempt to transfer over the Tc under normal conditions. |
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Step 2 Double-click the Service Application folder to open it.
Step 3 Double-click the Frame Relay Service Application folder to open it.
Step 4 Click the Frame Relay Service Profile folder to highlight it.
Step 5 Click the Object Viewer button on the toolbar.
Step 6 Click to highlight an empty cell in the Service Profile Subset Viewer. Enter the required attribute values and specify a name for a new Service Profile.
Step 7 Save the profile by clicking the save button on the toolbar.
Step 8 Apply the Transaction by clicking the apply button on the toolbar.
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Step 2 Double-click the Service Application folder to open it.
Step 3 Double-click the Frame Relay Service Application folder to open it.
Step 4 Click the Frame Relay Service Profile folder to highlight it if you wish to modify a Frame Relay Service Profile. Or, click the FR-ATM Interworking Service Profile folder to highlight it if you wish to create an FR-ATM Interworking Service Profile.
Step 5 Click the Object Viewer button on the toolbar.
Step 6 Click the cell of the attribute that you want to modify, and enter the new value.
Step 7 Save the modified profile by clicking the save button on the toolbar.
Step 8 Apply the Transaction by clicking the apply button on the toolbar.
Step 2 Double-click the Service Application folder to open it.
Step 3 Double-click the Frame Relay Service Application folder to open it.
Step 4 Double-click a type or profile that contains a specific profile that you want to delete (i.e. Frame Relay Service Profile)
Step 5 Click the specific profile and click the delete button on the toolbar.
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Note If you do not provide a value for one of the required attributes for the type of service that you are creating, CPC will use a default value of 0. |
Step 2 Double-click the Service Application folder to open it.
Step 3 Double-click the Frame Relay Service Application folder to open it.
Step 4 Click the Frame Relay Service folder to highlight it.
Step 5 Click on the Object Viewer button on the toolbar.
Step 6 Click to highlight an empty cell in the Frame Relay Service Object Viewer. Enter the required attribute values and specify a name for a new Service. The required values are:
Step 7 Save the service by clicking the save button on the toolbar.
Step 8 Apply the Transaction by clicking the apply button on the toolbar
Figure 13-2 shows the Frame Relay Service Object Viewer.
Step 2 Double-click the Service Application folder to open it.
Step 3 Double-click the Frame Relay Service Application folder to open it.
Step 4 Click the Frame Relay Service folder to highlight it.
Step 5 Click on the Object Viewer button on the toolbar.
Step 6 Click the Service you wish to modify to highlight it.
Step 7 Make the required modifications to the attribute values and save the service by clicking the save button on the toolbar.
Step 8 Apply the Transaction by clicking the apply button on the toolbar.
Step 2 Double-click the Service Application folder to open it.
Step 3 Double-click the Frame Relay Service Application folder to open it.
Step 4 Click the specific Service folder to highlight it.
Step 5 Click on the delete button on the toolbar.
Step 6 Apply the Transaction by clicking the apply button on the toolbar.
Posted: Thu Aug 3 16:41:18 PDT 2000
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