| Frame relay |
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Description | Glossary | RFCs | Publications | Obsolete RFCs |
| Type: | Data link layer protocol. |
| SNMP MIBs: | iso.org.dod.internet.mgmt.mib-2.transmission.mfrMIB (1.3.6.1.2.1.10.47).
iso.org.dod.internet.mgmt.mib-2.frAtmIwfMIB (1.3.6.1.2.1.86). iso.org.dod.internet.mgmt.mib-2.frsldMIB (1.3.6.1.2.1.95). |
| Working groups: |
bmwg, Benchmarking Methodology.Operations and Management area.
frnetmib, Frame Relay Service MIB. |
| Links: |
The Frame Relay network provides a number of virtual circuits that form the basis for connections between stations attached to the same Frame Relay network. The resulting set of interconnected devices forms a private Frame Relay group which may be either fully interconnected with a complete "mesh" of virtual circuits, or only partially interconnected. In either case, each virtual circuit is uniquely identified at each Frame Relay interface by a Data Link Connection Identifier (DLCI). In most circumstances, DLCIs have strictly local significance at each Frame Relay interface.
Frame format:
| 00 | 01 | 02 | 03 | 04 | 05 | 06 | 07 |
|---|---|---|---|---|---|---|---|
| Flag | |||||||
| Q.922 Address - | |||||||
| Q.922 Control | |||||||
| Pad | |||||||
| NLPID | |||||||
| Data ::: | |||||||
| Frame Check Sequence | |||||||
| Flag | |||||||
Flag.
8 bits.
Always set to 0x7E.
Indicates the beginning and/or end of the frame.
Q.922 Address. 16 bits (may be 24 or 32 bits on some systems).
Q.922 Control. 8 bits.
Pad.
Variable length, 0 or 8 bits.
This field is used to align the Data of the frame to a 16 bit boundary.
If present, the pad is a single byte and must have a value of zero.
NLPID, Network Level Protocol ID.
8 bits.
Specifies the encapsulated data format.
| NLPID | Description |
|---|---|
| 0x00 | Not used with Frame Relay. |
| 0x08 | Q.933. |
| 0x80 | SNAP. |
| 0x81 | ISO CLNP. |
| 0x82 | ISO ESIS. |
| 0x83 | ISO ISIS. |
| 0x8E | IPv6. |
| 0xB0 | FRF.9 Data Compression. |
| 0xB1 | FRF.12 Fragmentation. |
| 0xCC | IPv4. |
| 0xCF | PPP in Frame Relay. |
Frame Check Sequence. 16 bits.
CIR, Committed Information Rate.
(RFC 3202) The subscriber data rate (expressed in bits/second) that the network commits to deliver under normal network conditions.
NNI, Network to Network Interface.
PVC, Permanent Virtual Connection.
A virtual connection that has its endpoints and bearer capabilities defined at subscription time.
RP, Reference Point.
The point of reference within the network model at which the calculations or data collection takes place.
UNI, User to Network Interface.
RFCs:
[RFC 1586] Guidelines for Running OSPF Over Frame Relay Networks.
[RFC 1973] PPP in Frame Relay.
[RFC 2115] Management Information Base for Frame Relay DTEs Using SMIv2.
[RFC 2390] Inverse Address Resolution Protocol.
[RFC 2427] Multiprotocol Interconnect over Frame Relay.
[RFC 2590] Transmission of IPv6 Packets over Frame Relay Networks Specification.
[RFC 2954] Definitions of Managed Objects for Frame Relay Service.
[RFC 2955] Definitions of Managed Objects for Monitoring and Controlling the Frame Relay/ATM PVC Service Interworking Function.
[RFC 3020] Definitions of Managed Objects for Monitoring and Controlling the UNI/NNI Multilink Frame Relay Function.
[RFC 3034] Use of Label Switching on Frame Relay Networks Specification.
[RFC 3070] Layer Two Tunneling Protocol (L2TP) over Frame Relay.
[RFC 3202] Definitions of Managed Objects for Frame Relay Service Level Definitions.
[RFC 3133] Terminology for Frame Relay Benchmarking.
[RFC 4368] Multiprotocol Label Switching (MPLS) Label-Controlled Asynchronous Transfer Mode (ATM) and Frame-Relay Management Interface Definition.
[RFC 1293] Inverse Address Resolution Protocol.
[RFC 1294] Multiprotocol Interconnect over Frame Relay.
[RFC 1315] Management Information Base for Frame Relay DTEs.
[RFC 1490] Multiprotocol Interconnect over Frame Relay.
[RFC 1596] Definitions of Managed Objects for Frame Relay Service.
[RFC 1604] Definitions of Managed Objects for Frame Relay Service.
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Description | Glossary | RFCs | Publications | Obsolete RFCs |