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Table Of Contents
Frame Relay Point-Multipoint Wireless
Related Features and Technologies
Supported Standards, MIBs, and RFCs
Creating the Virtual Frame Relay Interface
Frame Relay Point-Multipoint Wireless
Feature History
Prior to 12.2(2)T
This feature was introduced on various platforms.
12.2(2)T
Support for this feature was added to multipoint fixed wireless.
This feature module describes Frame Relay support for multipoint fixed wireless. It includes information on the benefits of the new feature, supported platforms, related documents, and other information.
This document includes the following sections:
Feature Overview
This feature provides an end-to-end Frame Relay network for customers using wireless interfaces in their Frame Relay network. Several new commands are used to establish a virtual Frame Relay interface, then link it to a specific multipoint destination MAC address. The configuration information is associated with a new interface type, virtual Frame Relay and new interface commands, interface virtual-framerelay and frame-relay over radio.
Using the new interface enables Cisco uBR7200 series, Cisco 3600 series, and Cisco 2600 series routers to provide a seamless transition from a serial interface to a multipoint Frame Relay interface. By implementing RFC 1315, Frame Relay DTE MIB, a virtual Frame Relay interface can be linked to a specific multipoint radio interface and destination MAC address. The headend router acts as a Frame Relay switch, receiving radio frequency signals from subscriber units. Once received, the multipoint link is switched to a serial link and then to an upstream router.
Figure 1 Point to Multipoint
Benefits
This feature provides a seamless extension of Frame Relay services over fixed wireless. The look and feel of the interface is consistent with existing Frame Relay services.
The existing Frame Relay infrastructure is leveraged by creating a virtual interface. No hardware upgrade is required.
Restrictions
The wireless network module must be installed and configured correctly and use the Cisco IOS Release 12.2(2)T image. The virtual Frame Relay interface is used only in conjunction with the multipoint radio interface. It cannot be used in conjunction with the cable interface.
Frame Relay over fixed wireless offers a lower payload than over a serial interface. The payload is 1488 bytes compared to 1500 bytes when Frame Relay is on a serial link.
Related Features and Technologies
The multipoint fixed wireless interface must be used to take advantage of the new functionality.
Related Documents
For detailed information about Cisco multipoint wireless support on the Cisco uBR7200 series universal broadband routers, and the Cisco 2600 series and Cisco 3600 series routers, see the following documents:
Routers
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Router Products Command Reference
Headend Documents
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Subscriber Unit Documents
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Supported Platforms
The Frame Relay Point-Multipoint Wireless feature is supported on following platforms:
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Supported Standards, MIBs, and RFCs
Standards
DOCSIS 1.0 and 1.0+. The DOCSIS 1.0+ implementation is DOCSIS 1.0 with quality-of-service (QoS) support.
MIBs
This feature is supported by:
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To obtain lists of supported MIBs by platform and Cisco IOS release, and to download MIB modules, go to the Cisco MIB web site on cisco.com at the following URL:
http://www.cisco.com/public/sw-center/netmgmt/cmtk/mibs.shtml.
RFCs
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Prerequisites
The routers and wireless links must be functioning properly to use this feature.
Configuration Tasks
See the following sections for configuration tasks for the Frame Relay Point-Multipoint Wireless feature. Each task in the list indicates if the task is optional or required.
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Creating the Virtual Frame Relay Interface
To create a virtual Frame Relay interface, enter these commands beginning in the global configuration mode:
Verifying Virtual Frame Relay
To verify that the interface is present, enter the show interface virtual-framerelay command.
Troubleshooting Tips
Verify that the multipoint wireless link is up and is working properly, then follow standard Frame Relay troubleshooting procedures.
Configuration Examples
This section provides the following configuration examples:
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Headend Example
The example shows the virtual Frame Relay interface being created. The number assigned at the end of the interface virtual-framerelay command is the number assigned to the virtual interface. The frame-relay over radio command is used to link the interface to a specific MAC address after the interface has been created.
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interface virtual-framerelay1ip address 10.6.24.20 255.255.0.0frame-relay map ip 11.6.24.21 16frame-relay intf-type dceframe-relay route 100 interface Hssi1/0 100frame-relay route 200 interface Hssi1/0 300frame-relay over Radio3/0 0002.b905.fc30!interface virtual-framerelay2ip address 10.30.36.12 255.255.255.0frame-relay map ip 11.30.36.12 16frame-relay intf-type dceframe-relay route 100 interface Hssi1/0 200frame-relay route 200 interface Hssi1/0 400frame-relay over Radio3/0 0002.fd50.bf90interface Hssi1/0no ip addressencapsulation frame-relayno ip mroute-cachehssi internal-clockframe-relay lmi-type ciscoframe-relay intf-type dceframe-relay route 100 interface Virtual-FrameRelay1 100frame-relay route 200 interface Virtual-FrameRelay2 100frame-relay route 300 interface Virtual-FrameRelay1 200frame-relay route 400 interface Virtual-FrameRelay2 200!interface radio3/0 point-to-multipointip address 10.30.38.0 255.255.255.0no ip mroute-cacheno keepaliveradio cable-loss 1 4 1radio transmit-power 31radio upstream frequency 2156000 width 6.0radio upstream 0 subchannel 3 modulation-profile 8radio upstream 0 target-receive-power -72no radio upstream 0 shutdownradio upstream 1 target-receive-power -72radio upstream 1 shutdownradio upstream 2 target-receive-power -72radio upstream 2 shutdownradio upstream 3 target-receive-power -72radio upstream 3 shutdownradio downstream frequency 2530000 width 6.0radio downstream subchannel 2 modulation-profile 1radio su-onoff-trap interval 600interface virtual-frameRelay1Virtual-FrameRelay1 is up, line protocol is upHardware is Virtual Frame Relay interfaceMTU 1488 bytes, BW 100000 Kbit, DLY 100000 usec,reliability 255/255, txload 1/255, rxload 1/255Encapsulation FRAME-RELAY, loopback not setKeepalive set (10 sec)LMI enq sent 0, LMI stat recvd 0, LMI upd recvd 0LMI enq recvd 1175, LMI stat sent 1175, LMI upd sent 0, DCE LMI upLMI DLCI 1023 LMI type is CISCO frame relay DCEBroadcast queue 0/64, broadcasts sent/dropped 0/0, interface broadcasts 0Last input 00:00:07, output never, output hang neverLast clearing of "show interface" counters 4d03hQueueing strategy:fifoOutput queue 0/40, 0 drops; input queue 0/75, 0 drops5 minute input rate 9000 bits/sec, 2 packets/sec5 minute output rate 0 bits/sec, 0 packets/sec2094 packets input, 229655 bytes, 0 no bufferReceived 0 broadcasts, 0 runts, 0 giants, 0 throttles0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort1175 packets output, 66954 bytes, 0 underruns0 output errors, 0 collisions, 0 interface resets0 output buffer failures, 0 output buffers swapped out0 carrier transitionsSubscriber Unit Example
The example shows the interface virtual-framerelay command being used on the subscriber unit to create the virtual Frame Relay interface. The frame-relay over radio command is used to link the interface to a specific MAC address, after the interface has been created.
interface virtual-framerelay1ip address 11.6.24.21 255.255.0.0frame-relay over Radio1/0 0030.80ac.a054!interface virtual-framerelay1.1 point-to-pointip address 192.168.0.0 255.255.255.0no cdp enableframe-relay interface-dlci 100!interface virtual-framerelay1.2 multipointip address 192.168.1.1 255.255.255.0frame-relay map ip 192.168.1.0 200!interface radio1/0 point-to-multipointip address docsisno ip route-cacheno ip dvmrp auto-summaryno ip mroute-cachedocsis boot admin 2docsis boot oper 5docsis upstream channel 1 onlydocsis mac-timer t2 180000no docsis compliant bridgeradio cable-loss 1 2 1no cdp enableshow interface virtual-frameRelay1Virtual-FrameRelay1 is up, line protocol is upHardware is Virtual Frame Relay interfaceMTU 1488 bytes, BW 100000 Kbit, DLY 100000 usec,reliability 255/255, txload 1/255, rxload 1/255Encapsulation FRAME-RELAY, loopback not setKeepalive set (10 sec)LMI enq sent 1579, LMI stat recvd 1224, LMI upd recvd 0, DTE LMI upLMI enq recvd 0, LMI stat sent 0, LMI upd sent 0LMI DLCI 1023 LMI type is CISCO frame relay DTEBroadcast queue 0/64, broadcasts sent/dropped 0/0, interface broadcasts 0Last input 00:00:08, output never, output hang neverLast clearing of "show interface" counters 4d03hQueueing strategy:fifoOutput queue 0/40, 0 drops; input queue 0/75, 0 drops3 minutes, 30 seconds input rate 0 bits/sec, 0 packets/sec3 minutes, 30 seconds output rate 0 bits/sec, 0 packets/sec1984 packets input, 395391 bytes, 0 no bufferReceived 0 broadcasts, 0 runts, 0 giants, 0 throttles0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort2474 packets output, 875444 bytes, 0 underruns0 output errors, 0 collisions, 0 interface resets0 output buffer failures, 0 output buffers swapped out0 carrier transitionsCommand Reference
This section documents new commands. All other commands used with this feature are documented in the Cisco IOS Release 12.2 command reference publications.
New Commands
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debug frame-relay virtual
To display debug messages for the virtual Frame Relay interface, use the debug frame-relay virtual command. The debug frame-relay virtual command produces output only when problems occur.
debug frame-relay virtual destination interface
Syntax Description
Defaults
Disabled
Command History
Examples
The following example shows the output if one of the routers has not been configured. This output occurs when the other end is trying to send the receiving box Frame Relay packets.
VFR: Radio1/0 has no VFR for 00:00:C068:6F:AARelated Commands
frame-relay over radio
To link a virtual Frame Relay interface with a specific multipoint radio interface and destination MAC address, use the frame-relay over radio interface destination MAC address command in interface configuration mode. To disable this functionality, use the no form of this command.
The MAC address being linked is the MAC address of the remote end point. When configuring the headend, the MAC address being linked is the MAC address of the subscriber unit. When configuring the subscriber unit, the MAC address being linked is the MAC address of the headend.
frame-relay over radio interface destination mac address
no frame-relay over radio interface destination mac address
Syntax Description
interface
Slot number of the wireless modem card.
destination mac address
Port number, on the wireless modem card on the remote endpoint, that has the destination MAC address
Defaults
Disabled
Command Modes
Configuration mode
Command History
Usage Guidelines
Enable the virtual Frame Relay interface. Use the no form of the command to change the MAC address the interface is associated with. Use the frame-relay over radio command to associate the interface with the new MAC address.
Examples
The following example shows how to link the virtual Frame Relay interface to the specified radio interface and destination MAC address:
interface virtual-framerelay1ip address 10.6.24.21 255.255.0.0frame-relay over radio1/0 0030.80ac.a054Related Commands
interface virtual-framerelay
To create the virtual Frame Relay interface, use the interface virtual-framerelay command. To disable the virtual Frame Relay interface, use the no form of this command.
interface virtual-framerelay number
no interface virtual-framerelay number
Syntax Description
number
Defines the virtual interface and then associates the interface number with a specific wireless connection.
Defaults
Disabled
Command Modes
Configuration mode
Command History
Usage Guidelines
Create the virtual-framerelay interface that the Frame Relay configuration will be applied to and then use the frame-relay over radio command to associate the MAC address.
Examples
The following example shows how to define a virtual interface on a headend unit and then associate it with a specific IP address:
interface virtual-framerelay1ip address 10.6.24.20 255.255.0.0frame-relay map ip 11.6.24.21 16frame-relay intf-type dceframe-relay route 100 interface Hssi1/0 100frame-relay route 200 interface Hssi1/0 300frame-relay over Radio3/0 0002.b905.fc30Related Commands
