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This chapter provides information about provisioning Frame Relay to ATM interworking services.
The Frame Relay-ATM interworking service supports an interworking circuit between an ATM endpoint (UNI or NNI) and a Frame Relay endpoint (UNI or NNI).
The circuit can pass over combinations of Frame Relay and ATM networks, and one of its segments will contain a FR-ATM interworking function.
The configurable parameters for Frame Relay-ATM interworking (with the exception of types of interworking described below) are the same as the configurable parameters for Frame Relay and ATM. They are:
For more information about each of these service categories, refer to the chapters titled "Provisioning ATM Services" and "Provisioning Frame Relay Services".
Frame Relay network interworking transports Frame Relay packets across an intermediate ATM network to another Frame Relay network.
The Frame Relay packets are encapsulated into ATM cells and the Frame Relay header is encapsulated into AAL5 cell payload.
Frame Relay service interworking adapts Frame Relay packets into ATM cells for transmission onto an ATM network. After the ATM cells enter the network, the network can send them to ATM-attached devices or Frame Relay devices.
When the cells are sent to a Frame Relay device that can perform service interworking they are adapted back into Frame Relay packets.
Service interworking is useful when the destination endpoint of the end-to-end connection is unknown or could change.
For service interworking you can configure the type of mapping, either translated protocol mapping or transparent protocol mapping.
For translated protocol mapping, the system determines the protocol type, and remaps the frame relay protocol to the ATM protocol, and vice versa.
For transparent protocol mapping, the system does not determine the protocol type; it only removes the Frame Relay header and transfers the payload transparently between the Frame Relay and ATM networks. Unlike network interworking, the Frame Relay header is not encapsulated into the AAL5 cell payload.
You can create Service object profiles for the various types of Frame Relay-ATM interworking services. When you use a Service object profile CPC uses the values that you have specified in the profile to create 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 14-1 shows FR-ATM Interworking Service Profile Object Viewer.
The attributes for which you can provide values in the Frame Relay Service object profile are outlined in the Table 14-1 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. |
Class of Service | This is the ATM service category. |
SCR | This is the sustainable cell rate, which is the maximum average cell transmission rate that is allowed over a given period of time on a given circuit. It allows the network to allocate sufficient resources for guaranteeing that network performance objectives are met. |
PCR | This is the peak cell rate, which is the maximum allowed cell transmission rate (expressed in cells per second). It defines the shortest time period between cells and provides the highest guarantee that network performance objectives (based on cell loss ratio) will be met. |
MCR | This is the minimum cell rate, which is the minimum allocated bandwidth for a connection. |
MBS | Maximum burst size is the maximum number of cells that can be received at the PCR. This allows a burst of cells to arrive at a rate higher than the SCR. If the burst is larger than anticipated, the additional cells are either tagged or dropped. This parameters applies only to VBR traffic. |
CDVT | Cell Delay Variation Tolerance establishes the time scale over which the PCR is policed. This is set to allow for jitter (CDV). |
CDV (microseconds) | Cell delay variation (CDV) represents the difference between the maximum CTD and the minimum CTD. |
Max. CTD (microseconds) | Cell transfer delay is the time elapsed between departure time of a cell from the generating endsystem and the arrival time at the destination. |
CLR | The cell loss ratio QoS parameter is defined on a per connection basis as the number of lost cells divided by the total number of transmitted cells. |
Traffic | This is the traffic descriptor type which describes the specified traffic parameters for the service. |
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Note For attributes that do not have acceptable values listed in the Table 14-2 below, refer to the chapter titled "Configuring the Cisco 6400 Equipment Module" for a list of ranges that the equipment supports. |
| Attribute | Description | Acceptable Values |
|---|---|---|
SE Profile Name | This is the name of the Service element profile, obtained from the specific equipment module that is talking to the NMS for the network you are provisioning service 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. | integers; same as NNI Recovery Priorities (default=5) |
Interworking Type | This is the interworking type. |
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CIR | The rate at which the network commits to transfer information under normal conditions. The rate is average 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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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. |
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Class of Service | This is the ATM service category. | one of CBR, ABR, UBR, rt-VBR, nrt-VBR |
Sustainable Cell Rate (cells/s) | This is the sustainable cell rate, which is the maximum average cell transmission rate that is allowed over a given period of time on a given circuit. It allows the network to allocate sufficient resources for guaranteeing that network performance objectives are met. |
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Peak Cell Rate (cells/s) | This is the peak cell rate, which is the maximum allowed cell transmission rate (expressed in cells per second). It defines the shortest time period between cells and provides the highest guarantee that network performance objectives (based on cell loss ratio) will be met. |
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Minimum Cell Rate (cells/s) | This is the minimum cell rate, which is the minimum allocated bandwidth for a connection. |
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Maximum Burst Size (cells) | Maximum burst size is the maximum number of cells that can be received at the PCR. This allows a burst of cells to arrive at a rate higher than the SCR. If the burst is larger than anticipated, the additional cells are either tagged or dropped. This parameters applies only to VBR traffic. |
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CDVT (microseconds) | Cell Delay Variation Tolerance establishes the time scale over which the PCR is policed. This is set to allow for jitter (CDV). |
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Traffic Descriptor Type | This is the traffic descriptor type which describes the specified traffic parameters for the service. | depending on the QoS, one of CBR.1, ABR-FC, ABR-NFC, UBR.1, UBR.2, VBR.1, VBR.2, VBR.3 |
Peak to Peak Cell Delay Variation | Cell delay variation (CDV) represents the difference between the maximum CTD and the minimum CTD. |
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Max Cell Transfer Delay | Cell transfer delay is the time elapsed between departure time of a cell from the generating endsystem and the arrival time at the destination. |
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Cell Loss Ratio | The cell loss ratio QoS parameters is defined on a per connection basis as the number of lost cells divided by the total number of transmitted cells. |
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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 Interworking 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 Object 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.
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 FR-ATM Interworking Service Profile folder to highlight it to modify a FR-ATM Interworking service profile.
Step 5 Click the Object Viewer button on the toolbar.
Step 6 Click the cell o f 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 of profile that contains a specific profile that you want to delete (i.e. FR-ATM 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 Double-click the Frame Relay Interworking Service folder to highlight it.
Step 5 Click the Object Viewer button on the toolbar.
Step 6 Click to highlight an empty cell in the Frame Relay Interworking 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 14-2 shows the FR-ATM Interworking Service Object Viewer.
Step 2 Double-click the Service Application folder to open it.
Step 3 Double-click on the Frame Relay Service Application folder to open it.
Step 4 Click the Frame Relay Interworking Service folder to highlight it.
Step 5 Click the Object Viewer button on the toolbar.
Step 6 Click the Service you wish to modify.
Step 7 Make the required modifications to the attribute values and click save on the toolbar to save the service.
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 the Frame Relay Interworking Service folder to open it.
Step 5 Click the specific service object to highlight it.
Step 6 Click the delete button on the toolbar.
Step 7 Apply the Transaction by clicking the apply button on the toolbar.
Posted: Thu Aug 3 16:41:19 PDT 2000
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