Frame Relay to ATM Service Interworking (FRF.8 - Translation Mode)

Introduction

The Frame Relay (FR) to ATM service interworking function allows communication between an FR end user and an ATM end user. It is based on the Frame Relay Forum (FRF.8) implementation agreement, which specifies that an FR end station may communicate with an ATM end station provided that there is a router performing the specifications given in FRF.8 in the software between the two end stations.

This document presents a sample configuration of FR to ATM service interworking using FRF.8 (translation mode) on the LightStream 1010. This configuration also works on the Catalyst 8510 MSR or 8540 MSR.

Prerequisites

Requirements

There are no specific requirements for this document.

Components Used

The information in this document is based on Cisco IOS^® Release 12.0(3c)W5(9).

The information in this document was created from the devices in a specific lab environment. All of the devices used in this document started with a cleared (default) configuration. If your network is live, make sure that you understand the potential impact of any command.

Conventions

For more information on document conventions, refer to Cisco Technical Tips Conventions.

Configure

In this section, you are presented with the information to configure the features described in this document.

Note: To find additional information on the commands used in this document, use the Command Lookup Tool (registered customers only) .

Network Diagram

This document uses this network setup:

The FR traffic shaping parameters used in this sample configuration in Router 1 are:

• Committed information rate (CIR) = 64 kbps

• Committed burst (Bc) = 8000

• Excess burst (Be) = 8000

Note: For a detailed explanation on how to troubleshoot Frame Relay Traffic shaping connections, refer to show Commands for Frame Relay Traffic Shaping.

Configurations

This document uses these configurations:

• Router 1

• ATM Switch

• Router 2

Note: These configurations contain information relevant only for Frame Relay to ATM Service Interworking.

controller E1 5/0 
 channel-group 30 timeslots 1-31 
! 
interface Serial5/0:30 
 ip address 12.12.12.2 255.255.255.0 
 no ip directed-broadcast 
 encapsulation frame-relay IETF

!--- The FR encapsulation used is IETF. It should match the switch.
 
 no fair-queue 
 frame-relay traffic-shaping

!--- Enabling FR traffic shaping on this interface.
          
 frame-relay class test-iwf 
 frame-relay map ip 12.12.12.1 123 broadcast 
! 
map-class frame-relay test-iwf 
 no frame-relay adaptive-shaping

!--- Traffic shaping parameters configured.

 frame-relay cir 64000 
 frame-relay bc 8000 
 frame-relay be 8000

frame-relay connection-traffic-table-row index 123 64000 
8000 128000 8000 vbr-nrt 123 
! 
controller E1 4/0/0 
 clock source free-running 
 channel-group 30  timeslots 1-31 
! 
interface Serial4/0/0:30 
 no ip address 
 no ip directed-broadcast 
 encapsulation frame-relay IETF

!--- The FR encapsulation used is IETF.

 no arp frame-relay 
 frame-relay intf-type dce

!--- Interface type is dce, because it is providing clocking.

 frame-relay pvc 123 rx-cttr 123 tx-cttr 123 service translation 
 interface  ATM0/0/0 0 123 

!--- This command makes the translation from !--- Frame Relay to ATM PVC 123.

interface ATM2/0.123 point-to-point 
 ip address 12.12.12.1 255.255.255.0 
 no ip directed-broadcast 
 pvc 0/123

!--- Configured ATM PVC 0/123 with traffic shaping and !--- oam-pvc management enabled.
 
 vbr-nrt 163 81 49 
 broadcast 
 oam-pvc manage 
 encapsulation aal5snap

The traffic shaping parameters on Router 2 can be obtained from the Frame Relay connection traffic table on the ATM Switch (see the section).

Verify

This section provides information you can use to confirm your configuration is working properly.

Certain show commands are supported by the Output Interpreter Tool (registered customers only) , which allows you to view an analysis of show command output.

• show frame-relay lmi

• show frame-relay map

• show frame-relay pvc

• show atm vc interface atm 0/0/0

• show frame-relay connection-traffic-table-row

• show atm connection-traffic-table

• show frame-relay interface resource serial 4/0/0:30 all-information

The output shown below is a result of entering the above commands on the devices shown in the network diagram. This output shows that the network is operating properly.

Router 1

Note: When connecting a Cisco router to a third-party connection, it is preferable to use Internet Engineering Task Force (IETF) Local Management Interface (LMI). Notice that the LMI is Cisco and the Frame Relay is DTE as it is receiving clocking from the switch.

Router1# show frame-relay lmi 
 
LMI Statistics for interface Serial5/0:30 (Frame Relay DTE) LMI TYPE = CISCO
  Invalid Unnumbered info 0             Invalid Prot Disc 0
  Invalid dummy Call Ref 0              Invalid Msg Type 0
  Invalid Status Message 0              Invalid Lock Shift 0
  Invalid Information ID 0              Invalid Report IE Len 0
  Invalid Report Request 0              Invalid Keep IE Len 0
  Num Status Enq. Sent 1222             Num Status msgs Rcvd 1222
  Num Update Status Rcvd 0              Num Status Timeouts 2

To verify that the dlci is up and mapped to the correspondent IP address, use the show frame-relay map command.

Router1# show frame-relay map 

Serial5/0:30 (up): ip 12.12.12.1 dlci 123(0x7B,0x1CB0), static,
              broadcast,
              IETF, status defined, active

To check the status of the Frame Relay pvc, use the show frame-relay pvc command. In the output below we can see that It is active.

Router1# show frame-relay pvc 
 
PVC Statistics for interface Serial5/0:30 (Frame Relay DTE)
 
              Active     Inactive      Deleted       Static
  Local          1            0            0            0
  Switched       0            0            0            0
  Unused         0            0            0            0
 
DLCI = 123, DLCI USAGE = LOCAL, PVC STATUS = ACTIVE, INTERFACE = Serial5/0:30
 
  input pkts 786           output pkts 549          in bytes 742312    
  out bytes 684503         dropped pkts 6           in FECN pkts 0         
  in BECN pkts 0           out FECN pkts 0          out BECN pkts 0         
  in DE pkts 0             out DE pkts 0         
  out bcast pkts 1          out bcast bytes 608       
  pvc create time 03:25:16, last time pvc status changed 03:09:30

ATM Switch

Note: The term ATM-PX/Y/Z refers to pseudo interface.

ATMswitch# show atm vc interface atm 0/0/0
Interface         VPI  VCI   Type   X-Interface      X-VPI X-VCI Encap  Status 
ATM0/0/0          0    5     PVC    ATM2/0/0          0    43    QSAAL  UP
ATM0/0/0          0    16    PVC    ATM2/0/0          0    35    ILMI   UP
ATM0/0/0          0    101   PVC    ATM0/1/0          0    101          UP
ATM0/0/0          0    102   PVC    ATM0/1/0          0    102          UP
ATM0/0/0          0    123   PVC    ATM-P4/0/0        30   155          UP

To display the Frame Relay to ATM connections in the switch, use the show frame-relay connection-traffic-table-row command, as shown below:

ATMswitch# show frame-relay connection-traffic-table-row 
Row            cir      bc     be      pir      fr-atm Service-category    ATM Row
                                            
100           64000   32768   32768   64000            vbr-nrt              100       
123           64000   8000    8000    128000           vbr-nrt              123       


ATMswitch# show atm connection-traffic-table 
Row      Service-category    pcr        scr/mcr       mbs         cdvt
1            ubr          7113539        none                     none
2            cbr              424                                 none
3            vbr-rt           424         424          50         none
4            vbr-nrt          424         424          50         none
5            abr              424           0                     none
6            ubr              424        none                     none
10           cbr            50000                                 none
11           cbr             1000                                 none
12           cbr            11700                                 none
100          vbr-nrt           81          81-0        50         none
123          vbr-nrt          163          81-0        49         none 
<-- (*)

2147483645*  ubr                0        none                     none
2147483646*  ubr                1        none                     none
2147483647*  ubr          7113539        none                     none

(*) When you create the frame-relay connection-traffic-table-row, you associate an ATM table row index where the ATM traffic shaping parameters are automatically calculated using the Broadband Inter-Carrier Interface (B-ICI) specification, V2.0 (See formulas).

ATMswitch# show frame-relay interface resource serial 4/0/0:30 all-information 
Encapsulation: FRAME-RELAY
Resource Management configuration:
    Input queues (PAM to switch fabric):
       Discard threshold: 87% vbr-nrt, 87% abr, 87% ubr
       Marking threshold: 75% vbr-nrt, 75% abr, 75% ubr
    Output queues (PAM to line):
       Discard threshold: 87% vbr-nrt, 87% abr, 87% ubr
       Marking threshold: 75% vbr-nrt, 75% abr, 75% ubr
    Overflow servicing for VBR: enabled
  Available bit rates (in bps):
     1920000 vbr-nrt RX, 1920000 vbr-nrt TX
     1920000 abr RX,     1920000 abr TX
     1920000 ubr RX,     1920000 ubr TX
    Overbooking: disabled
Resource Management state:  Allocated bit rates (in bps):
     64000 vbr-nrt RX, 64000 vbr-nrt TX
     0 abr RX,     0 abr TX
     0 ubr RX,     0 ubr TX
  Actual allocated bit rates (in bps):
     64000 vbr-nrt RX, 64000 vbr-nrt TX
     0 abr RX,     0 abr TX
     0 ubr RX,     0 ubr TX

Troubleshoot

There is currently no specific troubleshooting information available for this configuration.

Related Information

• ATM to Frame Relay Interworking Technology Support
• ATM Technology Support