Table Of Contents
Frame Relay-to-ATM
Service Interworking (FRF.8)Supported Standards, MIBs, and RFCs
Configuring an FRF.8 Service Interworking Connection
Monitoring and Maintaining Frame Relay-to-ATM Interworking
FRF.8 Service Interworking Example
frame-relay interface-dlci switched (FR-ATM)
Frame Relay-to-ATM
Service Interworking (FRF.8)
This feature module describes the Frame Relay-to-ATM Service Interworking (FRF.8) feature. It includes information on the benefits, supported platforms, related documents, and so on.
This feature module includes the following sections:
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Supported Standards, MIBs, and RFCs
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Feature Overview
To communicate over WANs, end-user stations and the network cloud typically must use the same type of transmission protocol. This limitation has prevented differing networks such as Frame Relay and ATM from being linked. However, the Frame Relay-to-ATM Service Interworking (FRF.8) feature allows Frame Relay and ATM networks to exchange data, despite differing network protocols. The functional requirements for linking Frame Relay and ATM networks are provided by the Frame Relay/ATM PVC Service Interworking Implementation Agreement specified in Frame Relay Forum (FRF) document number FRF.8.
FRF.8 provides service interworking functionality that allows a Frame Relay end user to communicate with an ATM end user. Traffic is translated by a protocol converter that provides communication between dissimilar Frame Relay and ATM equipment. Figure 1 illustrates this concept.
Figure 1 Frame Relay-to-ATM Service Interworking (FRF.8)
FRF.8 describes a one-to-one mapping between a Frame Relay and an ATM PVC.
Benefits
The Frame Relay-to-ATM Service Interworking (FRF.8) feature benefits Internet service providers that need to link Frame Relay and ATM networks, especially those networks with ATM backbones and Frame Relay end users.
Restrictions
Some service interworking functions defined by FRF.8 are not supported or are not implemented in Cisco IOS Release 12.1(2)T. See the "Supported Standards, MIBs, and RFCs" section for a summary of the FRF.8 standards and Cisco support for these standards in Release 12.1(2)T.
Supported Platforms
The Frame Relay-to-ATM Service Interworking (FRF.8) feature is supported on the following platforms and interfaces:
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Supported Standards, MIBs, and RFCs
Standards
This section compares the networking standards defined in Frame Relay Forum Document Number FRF.8, Frame Relay/ATM PVC Service Interworking Implementation Agreement with those defined for the Cisco Frame Relay-to-ATM Service Interworking (FRF.8) feature.
The following sections and subsections in the FRF.8 agreement are supported as follows:
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MIBs
None
For descriptions of supported MIBs and how to use MIBs, see the Cisco MIB web site on CCO at http://www.cisco.com/public/sw-center/netmgmt/cmtk/mibs.shtml.
RFCs
None
Configuration Tasks
See the following sections for configuration tasks for the Frame Relay-to-ATM Service Interworking (FRF.8) feature. Each task in the list is identified as either optional or required.
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Configuring an FRF.8 Service Interworking Connection
To configure FRF.8 one-to-one protocol mapping between a Frame Relay end user and an ATM end user, use the following commands beginning in global configuration command mode:
To disconnect the FRF.8 interworking connection, use the shutdown connect subcommand.
Verifying Configuration
To verify correct configuration of the Frame Relay-to-ATM Service Interworking (FRF.8) feature, perform the following tasks:
Step 1
C3640# show connect id 10FR/ATM Service Interworking Connection: service-1Status - UPSegment 1 - Serial1/0 DLCI 16Segment 2 - ATM3/0 VPI 1 VCI 32Interworking Parameters -service translationefci-bit 0de-bit map-clpclp-bit map-deStep 2
C3640# show connect port atm3/0ID Name Segment 1 Segment 2 State========================================================================10 service-1 Serial1/0 16 ATM3/0 1/32 UPStep 3
C3640# show frame-relay pvcPVC Statistics for interface Serial1/0 (Frame Relay DCE)Active Inactive Deleted StaticLocal 0 0 0 0Switched 1 0 0 0Unused 0 0 0 0DLCI = 18, DLCI USAGE = FRF.5, PVC STATUS = ACTIVE, INTERFACE =Serial1/0input pkts 22 output pkts 21 in bytes 2140out bytes 2110 dropped pkts 0 in FECN pkts 0in BECN pkts 0 out FECN pkts 0 out BECN pkts 0in DE pkts 0 out DE pkts 0out bcast pkts 0 out bcast bytes 0 Num PktsSwitched 22pvc create time 02:02:49, last time pvc status changed 02:02:42Step 4
C3640# show atm pvcVCD / Peak Avg/MinBurstInterface Name VPI VCI Type Encaps SC Kbps KbpsCells Sts3/0 10 1 32 PVC FRATMSRV UBR155000 UPMonitoring and Maintaining Frame Relay-to-ATM Interworking
To display status of the virtual circuits and the Frame Relay-to-ATM interworking connections, use any of the following commands in EXEC mode:
Configuration Example
This section provides the following configuration example:
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FRF.8 Service Interworking Example
The following example shows how to configure an FRF.8 service interworking connection:
;; Configure a switched Frame Relay DLCI;interface serial 0frame-relay interface-dlci 100 switched;; Configure ATM PVC with FRF.8 encapsulation;interface atm1/0pvc 0/32encapsulation aal5mux fr-atm-srv;; Create a connection that connects Frame Relay DLCI 100 to ATM PVC 1/32;connect service-1 Serial0 100 ATM3/0 1/32 service-interworkingefci-bit map-fecnCommand Reference
This section documents the following new and modified commands. All other commands used with this feature are documented in the Cisco IOS Release 12.1 command reference publications.
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clp-bit
To set the ATM cell loss priority (CLP) field in the ATM cell header, use the clp-bit connect submode command. To disable ATM CLP bit mapping, use the no form of this command.
clp-bit {0 | 1 | map-de}
no clp-bit {0 | 1 | map-de}
Syntax Description
Defaults
The default is set to map-de.
Command Modes
FRF.8 connect submode
Command History
Usage Guidelines
This command maps from Frame Relay to ATM.
Examples
The following example sets the CLP field in the ATM header to 1 for FRF.8:
C3640(config)# connect service-1 Serial1/0 16 ATM3/0 1/32 service-interworkingC3640(config-frf8)# clp-bit 1Related Commands
Connects a Frame Relay DLCI to an ATM PVC.
Sets the Frame Relay DE bit field in the Frame Relay cell header.
Sets the EFCI bit field in the ATM cell header.
connect (FR-ATM)
To configure an FRF.8 one-to-one mapping between a Frame Relay data-link connection identifier (DLCI) and an ATM permanent virtual circuit (PVC), use the connect global configuration command. To remove a connection, use the no form of this command.
connect connection-name {FR-interface FR-DLCI | ATM-interface ATM-VPI/VCI} service-interworking
no connect connection-name {FR-interface FR-DLCI | ATM-interface ATM-VPI/VCI} service-interworking
Syntax Description
Defaults
No default behavior or values.
Command Modes
Global configuration
Command History
Usage Guidelines
Use the connect command to connect a Frame Relay DLCI to an ATM PVC.
To disconnect the FRF.8 interworking connection, use the shutdown connect subcommand.
Examples
The following example shows how to create an FRF.8 connection:
router(config)# interface serial0router(config-if)# frame-relay interface-dlci 100 switchedrouter(config-if)# interface atm1/0router(config-if)# pvc 0/32router(config-if-atm-vc)# encapsulation aal5mux fr-atm-srvrouter(config)# connect service-1 Serial0 100 ATM3/0 1/32 service-interworkingrouter(config-frf8)# efci-bit map-fecnRelated Commands
de-bit
To set the Frame Relay discard eligible (DE) bit field in the Frame Relay cell header for FRF.8 service interworking, use the de-bit connect submode command. To disable or reset Frame Relay DE bit mapping, use the no form of this command.
de-bit {0 | 1 | map-clp}
no de-bit {0 | 1 | map-clp}
Syntax Description
Defaults
The default is set to map-clp.
Command Modes
FRF.8 connect submode
Command History
Usage Guidelines
This command maps from ATM to Frame Relay.
Examples
The following example sets the DE bit field in the Frame Relay cell header to 1:
C3640(config)# connect service-1 serial1/0 16 atm3/0 1/32 service-interworkingC3640(config-frf8)# de-bit 1Related Commands
Sets the ATM CLP field in the ATM cell header.
Connects a Frame Relay DLCI to an ATM PVC.
Sets the EFCI bit field in the ATM cell header.
efci-bit
To set the explicit forward congestion indication (EFCI) bit field in the ATM cell header for FRF.8 service interworking, use the efci-bit connect submode command. To disable or reset this bit, use the no form of this command.
efci-bit {0 | map-fecn}
no efci-bit {0 | map-fecn}
Syntax Description
Defaults
The default is 0.
Command Modes
FRF.8 connect submode
Command History
Usage Guidelines
This command maps from Frame Relay to ATM.
Examples
The following example creates a connection that connects Frame Relay DLCI 100 to ATM PVC 0/32, and sets the EFCI field in the ATM cell header to 1 when the FECN field in the Frame Relay header is set:
router(config)# interface atm1/0router(config-if)# pvc 0/32router(config-if)# encapsulation aal5mux fr-atm-srvrouter(config)# connect serial0 100 atm1/0 0/32 service-interworkingrouter(config-frf8)# efci-bit map-fecnRelated Commands
frame-relay interface-dlci switched (FR-ATM)
To indicate that a Frame Relay data-link connection identifier (DLCI) is switched, use the frame-relay interface-dlci switched interface configuration command. To remove this assignment, use the no form of this command.
frame-relay interface-dlci dlci switched
no frame-relay interface-dlci dlci switched
Syntax Description
Defaults
No DLCI is assigned.
Command Modes
Interface configuration
Command History
10.0
This command was introduced.
12.1(2)T
The switched keyword was added for the Frame Relay-to-ATM Service Interworking (FRF.8) feature.
Usage Guidelines
This command creates an FRF.8 Frame Relay DLCI.
Examples
The following example configures serial interface 0 as a switched Frame Relay DLCI:
router(config)# interface serial0router(config-if)# frame-relay interface-dlci 100 switchedrouter(config-fr-dlci)#Related Commands
show frame-relay pvc
Displays statistics about Frame Relay interfaces.
show interface
Displays interface information.
service translation
To enable upper layer user protocol encapsulation for Frame Relay-to-ATM Service Interworking (FRF.8) feature, which allows mapping between encapsulated ATM protocol data units (PDUs) and encapsulated Frame Relay PDUs, use the service connect submode command. To disable upper layer user protocol encapsulation, use the no form of this command.
service translation
no service translation
Syntax Description
This command has no arguments or keywords.
Defaults
The default state is service translation.
Command Modes
FRF.8 connect submode
Command History
Usage Guidelines
The no service translation command disables mapping between encapsulated ATM PDUs and encapsulated Frame Relay PDUs.
Examples
The following example shows an FRF.8 configuration with service translation disabled:
C3640# show running:configurationBuilding configuration...Current configuration:connect service-1 Serial1/0 16 ATM3/0 1/32 service-interworkingno service translationefci-bit map-fecnThe following example shows how to configure service translation on the connection named service-1:
router(config)# connect service-1 serial1/0 16 ATM3/0 1/32 service-interworkingrouter(config-frf8)# service translationRelated Commands
Sets the ATM CLP field in the ATM cell header.
Sets the Frame Relay DE bit field in the Frame Relay cell header.
Sets the EFCI bit field in the ATM cell header.
show connect
To display statistics and other information about Frame Relay-to-ATM Service Interworking (FRF.8) connections, use the show connect EXEC command.
show connect [all | element | ID | name | port]
Syntax Description
Defaults
Default state is show connect all.
Command Modes
EXEC
Command History
Examples
The following example displays information about the specified FRF.8 connection identifier:
C3640# show connect id 10FR/ATM Service Interworking Connection: service-1Status - UPSegment 1 - Serial1/0 DLCI 16Segment 2 - ATM3/0 VPI 1 VCI 32Interworking Parameters -service translationefci-bit 0de-bit map-clpclp-bit map-deThe following example displays information about the FRF.8 connection on an interface:
C3640# show connect port atm3/0ID Name Segment 1 Segment 2 State========================================================================10 service-1 Serial1/0 16 ATM3/0 1/32 UPTable 2 describes the fields seen in these displays.
Related Commands
shutdown
To shut down a Frame Relay-to-ATM Service Interworking (FRF.8) connection, use the shutdown connect submode command. To disable disconnection, use the no form of this command.
shutdown
no shutdown
Syntax Description
This command has no arguments or keywords.
Defaults
No default behavior or values.
Command Modes
FRF.8 connect submode
Command History
Usage Guidelines
The FRF.8 connection must be manually shut down once the interworking connection is created by use of the shutdown connect subcommand.
Examples
The following example shows how to shut down an FRF.8 connection:
C3640(config)# connect serial0 100 atm3/0 1/35 service-interworking. . .C3640(config-frf8)# shutdownRelated Commands
Glossary
Asynchronous Transfer Mode—See ATM.
ATM—Asynchronous Transfer Mode. International standard for cell relay in which multiple service types (such as voice, video, or data) are conveyed in fixed-length (53-byte) cells. Fixed-length cells allow cell processing to occur in hardware, thereby reducing transit delays. ATM is designed to take advantage of high-speed transmission media such as E3, SONET, and T3.
data-link connection identifier—See DLCI.
DLCI—data-link connection identifier. Value that specifies a permanent virtual circuit or switched virtual circuit in a Frame Relay network. In the basic Frame Relay specification, DLCIs are locally significant (connected devices might use different values to specify the same connection).
Frame Relay—Industry-standard, switched data link layer protocol that handles multiple virtual circuits using High-Level Data Link Control encapsulation between connected devices.
IMA—inverse multiplexing over ATM. Standard protocol defined by the ATM Forum in 1997.
inverse multiplexing over ATM—See IMA.
OC-3—optical carrier signal level 3. One of a series of physical protocols defined for SONET optical signal transmissions.
optical carrier signal level 3—See OC-3.
permanent virtual circuit—See PVC.
PVC—permanent virtual circuit. Virtual circuit that is permanently established. PVCs save bandwidth associated with circuit establishment and tear down in situations where certain virtual circuits must exist all the time. In ATM terminology, called a permanent virtual connection.
service specific convergence sublayer—See SSCS.
SSCS—service specific convergence sublayer. One of the two sublayers of any ATM adaption layer (AAL). SSCS, which is service dependent, offers assured data transmission.
SVC—switched virtual circuit. Virtual circuit that is dynamically established on demand and is torn down when transmission is complete. SVCs are used in situations where data transmission is sporadic. In ATM terminology, called a switched virtual connection.
switched virtual circuit—See SVC.
