SNAP SAP EtherType. A receive-only protocol
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1 SNAP SAP EtherType A receive-only protocol Mick Seaman mick_seaman@ieee.org May 09 Receive-only protocol Mick Seaman 1
2 Receive-only protocol Data communication protocols generally use both transmission and reception Many real-world protocols are transmit only Design of receive-only protocols has been neglected This proposal is a first step in remedying that deficiency May 09 Receive-only protocol Mick Seaman 2
3 SNAP SAP EtherType Request for AA-AA EtherType assignment Specific value requests not normally allowed No other value will do Purpose/reason for allocation The technical issue Assign or reserve? Protocol definition Non-use Example Closing thoughts May 09 Receive-only protocol Mick Seaman 3
4 Purpose/Reason for allocation Unambiguous protocol identification when EtherType/LLC choice unclear e.g. frame length not in frame data» length known as part of storage mechanism» frame decapsulated/detagged from longer frame, possibly originating from different media type Enhance interoperability by giving EtherType users (the option of) frame enlargement capabilities that LLC users currently enjoy May 09 Receive-only protocol Mick Seaman 4
5 Technical issue If a frame Starts with AA-AA WX-YZ and is an LLC frame then WX-YZ is an EtherType value But what if a frame Starts with AA-AA WX-YZ and started with an EtherType (AA-AA) EtherType AA-AA is not yet assigned Can we, in good conscience, allow assignment? May 09 Receive-only protocol Mick Seaman 5
6 Assign or reserve Ensure AA-AA is not accidentally assigned Reservation is not a well-used process Assignment has to be to something Assign to 802.1H state May need to define associated protocol Easiest match to established procedure May 09 Receive-only protocol Mick Seaman 6
7 Protocol definition for AA-AA EtherType Reception If received in a context requiring EtherType on transmit, discard frame, else If octet after AA-AA is not 03 or less than 6 octets follow, discard frame, else If AA-AA-03 followed by following two octets are an EtherType (for remainder), else Six octets after AA-AA-03 are SNAP SAP PID Transmit No frames are transmitted for this protocol May 09 Receive-only protocol Mick Seaman 7
8 Example correct non-use FDDI Bridge C-TAGs Ethernet frame DA SA AA-AA C-TCI EtherType.. FDDI PEB S-TAGs frame correctly DA SA AA-AA A8 S-TCI C- FDDI-Ethernet PCB forwards frame DA SA 88-A8 S-TCI C-TCI EtherType Data Ethernet PEB removes S-TAG DA SA C-TCI EtherType Data Ethernet Bridge removes C-TAG to deliver frame DA SA EtherType Data NOTE: C-TCI includes C-VID, Priority, DEI S-TCI includes S-VID, Priority, DEI May 09 Receive-only protocol Mick Seaman 8
9 Example incorrect use FDDI PEB S-TAGs frame incorrectly DA SA AA-AA A8 S-TCI AA-AA C-TCI EtherType.. FDDI-Ethernet PCB forwards incorrectly tagged frame DA SA 88-A8 S-TCI AA-AA C-TCI EtherType Data Ethernet PEB removes S-TAG DA SA AA-AA C-TCI EtherType.. Ethernet Bridge removes C-TAG, delivers incorrect frame DA SA AA-AA-03 EtherType Data May 09 Receive-only protocol Mick Seaman 9
10 Attempt to handle incorrect use FDDI-Ethernet PCB forwards incorrectly tagged frame DA SA 88-A8 S-TCI AA-AA C-TCI EtherType Data Ethernet PEB removes S-TAG DA SA AA-AA C-TCI EtherType.. Helpful Ethernet Bridge removes SNAP SAP encoded C- TAG, delivers correct frame DA SA AA-AA-03 EtherType Data May 09 Receive-only protocol Mick Seaman 10
11 AA-AA accidentally assigned FDDI End Station transmits LLC SNAP encoded EtherTyped frame DA SA AA-AA EtherType (AA) Data FDDI PEB S-TAGs frame correctly, FDDI-Ethernet PCB forwards frame, Ethernet PEB removes S-TAG DA SA EtherType(AA) Data(AA xxyy...) Helpful Ethernet Bridge removes AA AA , incorrectly delivers frame fragment DA SA EtherType(xx) Data(yy..) May 09 Receive-only protocol Mick Seaman 11
12 Closing thoughts Objective is partly to discourage AA EtherType use, part to avoid consequences of proprietary helpful attempts, part to protect an unwitting future assignee of the AA EtherType Discouraging future use of AA to shift the problem around requires defining the protocol Discouraging use is at odds with defining what the protocol does May 09 Receive-only protocol Mick Seaman 12
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