| LFAP, Light-weight Flow Admission Protocol |
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Description | Glossary | RFCs | Publications | Obsolete RFCs |
| Protocol suite: | TCP/IP. |
| Protocol type: | Application layer protocol. |
| Ports: | 3145 (TCP). |
| URI: | |
| MIME subtype: | |
| SNMP MIBs: | |
| Working groups: | |
| Links: |
LFAP, allows an external Flow Admission Service (FAS) to manage flow admission at the switch, allowing flexible Flow Admission Services to be deployed by a vendor or customer without changes to, or undue burden on, the switch.
Specifically, this document specifies the protocol between the switch Connection Control Entity (CCE) and the external FAS. Using LFAP, a Flow Admission Service can: allow or disallow flows, define the parameters under which a given flow is to operate (operating policy) or, redirect the flow to an alternate destination. The FAS may also maintain details of current or historical flows for billing, capacity planning and other purposes.
| MAC header | IP header | TCP header | LFAP header | Data ::: |
LFAP header:
| 00 | 01 | 02 | 03 | 04 | 05 | 06 | 07 | 08 | 09 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Version | Code | reserved | Status | ||||||||||||||||||||||||||||
| Message ID | Message Length | ||||||||||||||||||||||||||||||
| Data ::: | |||||||||||||||||||||||||||||||
Version.
8 bits.
LFAP version number.
Code. 8 bits.
| Code | Description |
|---|---|
| 1 | FAR. |
| 2 | FAA. |
| 3 | FAU. |
| 4 | FUN. |
| 5 | FUA. |
| 6 | FCR. |
| 7 | FCA. |
| 8 | AR. |
| 9 | ARA. |
reserved. 8 bits.
Status. 8 bits.
| Status | Description |
|---|---|
| 0 | Success. |
| 1 | Corrupted. |
| 2 | Version. |
Message ID.
16 bits.
Used to associate each original message with its corresponding response and must
be unique for the combination of sender and responder while an original message is pending.
Message Length.
16 bits.
Excludes the 8 bytes of the message header.
Data.
Variable length.
Contains Information Elements.
Information Element:
| 00 | 01 | 02 | 03 | 04 | 05 | 06 | 07 | 08 | 09 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Type | Length | ||||||||||||||||||||||||||||||
| Value ::: | |||||||||||||||||||||||||||||||
Type. 16 bits.
Length.
16 bits.
Size of the Value field in bytes.
Value. Variable length.
RFCs:
[RFC 2124] Cabletron's Light-weight Flow Admission Protocol Specification Version 1.0.
[RFC 3955] Evaluation of Candidate Protocols for IP Flow Information Export (IPFIX).
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Description | Glossary | RFCs | Publications | Obsolete RFCs |