[416] B BID: 082903ON4HU Path: PE1GCB!PA3AWG!PA0TMA!PI8AYB!PE1ABT!PI8ERG!PI8ZAA!PI8HWB!ON6AR!ON7RC Path: ON4HU Date: 12 Feb 89 01:07:26 L From: ON4HU@ON4HU To: THENET@BLGNET Subject: PARMS COMMAND NET/ROM THENET :Msg # Type:B Stat:$ To: ALLE @ON4HU From: HB9CWG Date: 02-Dec/1312 Subject: Net/Rom -PARMS- Command Bulletin ID: CRE8707214 Path: LA6OCA!HB9AC HB9CWG de HB9F, #1813, BBS Bern / RX: 870721 - 0319 / TX: 870721 - 0747 BESCHREIBUNG DER PARAMETER DIE MIT DEM BEFEHL -PARMS- VON NETROM ABGERUFEN WERDEN KOENNEN. PARAMETER 1: - MAXIMUM DESTINATION LIST ENTRIES - DEFINES THE MAXIMUM ALLOWABLE NUMBER OF DESTINATION IN THE NODES'S ROUTING TABLE. EACH DESTINATION CONSUMES 32 BYTES OF RAM. THE CONTROL COPERATOR CON USE THIS PARAMETER TO LIMIT THE AMOUNT OF RAM THAT IST ALLOCATED TO THE ROUTING TABLE, THUS ENSURING THAT SUFFICIENT SPACE REMAINS FOR FRAME BUFFERING. PARAMETER 2: - WORST QUALITY FOR AUTO-UPDATES - DEFINES THE POOREST ROUTE QUALITY THAT WILL BE AUTOMATICALLY ADDED TO THE NODE'S ROUTING TABLE. THE CONTROL OPERATOR CAN USE THIS PARAMETER TO LIMIT THE AUTOMATIC ROUTING UPDATE FUNCTION TO ACCEPT ONLY HIGHER-QUALITY ROUTES. IN ADDITION, THE AUTOMATIC UPDATE FUNKTION CAN BE DISABLED ALTOGETHER BY SETTING THIS PARAMETER TO ZERO. PARAMETER 3: - CHANNEL 0 (HDLC) QUALITY - DEFINES THE QUALITY OF THE RADIO CHANNEL CONNECTED TO THE NODE'S HDLC PORT. THE CONTROL OPERATOR SHOULD SET THIS PARAMETER TO AN APPROPRIATE QUALITY VALUE IN ACCORDANCE WITH THE SPEED, RELIABILITY, AND CONGESTION ANTICIPATED ON THE CHANNEL. THE AND CONGESTION ANTICIPATED ON THE CHANNEL. THE DEFAULT VALUE OF 192 IS APPROPRIATE FOR A 1200-BAUD USER-ACCESSIBLE FRD USER-ACCESSIBLE FREQUENCY... IF THE ACTUAL CHANNEL QUALITY IS BETTER (E.G. A UHF BACBONE FREQUENCY) OR WORSE (E.G. AN HF LINK) THE PARAMETER VALUE SHOULD BE CHANGED ACCORDINGLY. PARAMETER 4: - CHANNEL 1 (RS232) QUALITY - DEFINES THE QUALITY OF THE TNC-TO-TNC INTERCONNECT CHANNEL CONNECTED TO THE NODE'S RS232 PORT. THE CONTROL OPERATOR SHOULD SET THIS PARAMETER TO AN APPROPRIATE QUALITY VALUE IN ACCORDANCE WITH THE SPEED, RELIABILITY, AND CONGESTION ANTICIPATED ON THE CHANNE. THE DEFAULT VALUE OF 255 IS APPROPRIATE FOR 9600-BAUD TWO-MODEM INTERCONNECT CABLE..... IF THE ACUAL CHANNEL QUALITY IS WORSE (E.G. A THREE- OR FOUR-PORT INTERCONNECT, OR A SATELLITE LINK), THE PARAMETER VALUE SHOULD BE CHANGED ACCORDINGLY. PARAMETER 5: - OBSOLESCENCE COUNT INITIALIZER - DEFINES THE INITIAL VALUE GIVEN TO THE OBSOLESCENCE COUNT OF A ROUTE THAT HAS BEEN NEWLY ADDED OR UPDATED BY THE NODE'S AUTOMATIC ROUTING TABLE UPDATE MECHANISM. THE OBSOLESCENCE COUNT OF A ROUTE IS ALSO REINITIALIZED TO THIS VALUE WHENEVER THE ROUTE IS ACTUALLY USED SUCCESSFULLY. THE OBSOLESCENCE COUNT OF A ROUTE IS DECREMENTED ONCE EACH AUTO-UPDATE BROADCAST INTERVAL. HOWEVER, SUCH PERIODIC DECREMENTING OF ROUTE OVSOLESCENCE COUNTS CAN BE DISABLED ALTOGETHER BY SETTING THIS PARAMETER TO ZERO. PARAMETER 6: - OBSOLESCENCE COUNT MINIMUM TO BE BROADCAST - DEFINES THE MINIMUM OBSOLESCENCE COUNT THRESHOLD BELOW WHICH A ROUTE WILL NOT BE INCLUDED IN THE NODE'S AUTOMATIC ROUTING BROADCASTS. THE PURPOSE OF THIS THRESHOLD IS TO PREVENT THE NODE FROM BROADCASTING "STALE" ROUTING TINFORMATION TO OTHER NODES. UNDER NORMAL CIRCUMSTANCES, THIS PARAMETER SHOULD BE ASSIGNED A VALUE NO GREATER THAN THE VALUE OF PARAMETER 5. IF IT IS GREATER, THE NODE'S BROADCASTS WILL INCLUDE NO DESTINATIONS OTHER THAN ITSELF. PARAMETER 7: - AUTO-UPDATE BROADCAST INTERVAL - DEFINES THE NUMBER OF SECONDS BETWEEN AUTOMATIC ROUTING BROADCASTS ISSUED BY THE NODE. THE DEFAULT VALUE OF 3600 SPECIFIES AN HOURLY BROADCAST. IN ADDITION, BROADCASTS CAN BE DISABLED ALTOGETHER BY SETTING THIS PARAMETER TO ZERO. PARAMETER 8: - NETWORK "TIME-TO-LIVE" INITIALIZER - DEFINES THE INITIAL VALUE OF THE "TIME-TO-LIVE" FIELD IN THE NETWORK HEADER OF ALL NETWORK-LAYER FRAMES ORIGINATED BY THIS NODE. THE TIME-TO-LIVE FIELD IS DECREMENTED BY EACH INTERMEDIATE NODE THAT RELAYS THE FRAME. IF THE TIME-TO-LIVE VALUE EVER REACHES ZERO, THE FRAME IS DISCARDED. THIS PROTECTS THE NETWORK AGAINST FRAMES PERSISTING FOREVER AS THE RESULT OF A ROUTING LOOP. THE VALUE OF THIS PARAMETER SHOULD BE A BIG LARGER HAN NUMBER OF "HOPS" IN THE LONGEST LEGITIMATE ROUTE IN THE NETWORK. PARAMETER 9: - TRANSPORT TIMEOUT - DEFINES THE NUMBER OF SECONDS BETWEEN TRANSPORTLAYER RETRIES. PARAMETER 10: - TRANSPORT MAXIMUM TRIES - DEFINES THE MAXIMUM NUMBER OF TRANSPORT-LAYER TRIES ATTEMPTED BEFORE A CIRCUIT FAILURE IS REPORTED. PARAMETER 11: - TRANSPORT ACKNOWLEDGE DELAY - DEFINES THE NUMBER DEFINES THE NUMBER OF SECONDS DELAY USED BY THE TRANSPORT LAYER FROM THE TIME IT RECEIVES AN INFORMATION MESSA RECEIVING ACKNOWLEDGEMENT. PARAMETER 14: - CONGESTION CONTROL THRESHHOLD - DEFINES THE MAXIMUM ALLOWABLE SENDS A CHOKE MESSAGE. ALSO DEFINES THE MAXIMUM ALLOWABLE BACKLOG OF FRAMES THAT THE LINK LAYER DEFINES THE MAXIMUM NUMBER OF SECONDS THAT A TRANSPORT-LAYER CIRCUIT OR A LINK-LAYER CONNECTIONRCUIT OR A LINK-LAYER CONNECTION .E. NO INFORMATION TRANSFER IN EITHER DIRECTION) BEFORE IT IS AUTOMATICALLY DISCONNECTED. PARAMETERAME" - DEFINES THE MAXIMUM NUMBER OF OUTGOING INFORMATION FRAMES THAT THE LINK LAYER WILL SEND WITHOUT RECEIVING ACKNOWLEDGEMENT. PARAMETER 19: - LINK MAXIMUM TRIES - DEFINES THE MAXIMUM NUMBER OF TRIES THAT THE LINK LAYER WILL ATTEMPT BEFORE REPORTING A LINK FAILURE. IF THIS PARAMETER IS SET TO ZERO, THE LINK LAYER WILL RETRY FOREVER (NOT RECOMMENDED). PARAMETER 20: - LINK T2 TIMEOUT - DEFINES THE DELAY USED BY THE LINK LAYER FROM THE TIME IT RECEIVES AN INFORMATION FRAME UNTIL IT TIME IT RECEIVES AN INFORMATION FRAME UNTIL IT SENDS AN ACKNOWLEDGEMENT (RR, RNR, OR REJ) CONTROL