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RE: [BPQ32] VHF Port traffic

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  • John Wiseman
    Mark, The /
    Message 1 of 2 , Jun 13, 2013
      Mark,
       
      The <RR C P> / <RR R F) pair are link validation polls. They are sent periodically on all open ax.25 connections to verify that the station at the other end is still there. You seem to be sending every 2 minutes. I prefer 3 minutes. The interval is controlled by the T3 param in bpq32.cfg. If you can coordinate with other local stations, set values around 180, but varying by a few seconds, so the stations don't try to send the validation poll at the same time, Although you could set longer times to reduce the traffic I strongly recommend not doing so.
       
      The messages to KEEPLI are sent to keep circuits between nodes open. Normally an idle ax.25 link is closed after a period on inactivity, controlled by IDLETIME. I suggest a value of 900. One problem with NETROM networks is that if a Node goes offline for any reason, this may not be detected by other Nodes in the network for quite a long period (possibly several hours). Invalid routing information is broadcast during this interval. To avoid this, the software maintains a link between each node, and if it fails and can't be restarted all the Nodes heard over that link are deleted from the table. My feeling is that the extra traffic generated (a message pair every 3 mins, plus one roughly every 12 minutes) is a reasonable price to pay for a more reliable network, but if you don't agree you can disable the Keepalive function by adding NOKEEPALIVES=1 to the Port configuration.
       
      Normally a lot more traffic is caused by the NODES broadcasts. You can use the PORT config MINQUAL parameter to control the number of stations included in the broadcasts, and the NODESINTERVAL command to control their frequency. When all links were on RF, the standard NODESINTERVAL was 60 minutes. When people started using axip links many reduced this as bandwidth wasn't an issue, and it allowed the network to respond more quickly to changes. However if you have any RF links I recommend sticking to 60 minutes.
       
      73, John
       
       

      From: BPQ32@yahoogroups.com [mailto:BPQ32@yahoogroups.com] On Behalf Of n5mdt
      Sent: 13 June 2013 13:27
      To: BPQ32@yahoogroups.com
      Subject: [BPQ32] VHF Port traffic

       

      Would someone be kind enough to interpret this traffic for me? This is on a VHF port. There are three stations in close proximity to each other and this is the traffic seen.

      ----------------
      11:42:32T N5MDT-13>WD5CFJ-7 Port=5 <RR C P R1>
      11:42:33R WD5CFJ-7>N5MDT-13 Port=5 <RR R F R0>
      11:42:57T N5MDT-13>WA5EOC-7 Port=5 <RR C P R1>
      11:42:58R WA5EOC-7>N5MDT-13 Port=5 <RR R F R0>
      11:43:20R WA5EOC-7>WD5CFJ-7 Port=5 <I C P S4 R4> NET/ROM
      WA5EOC-7 to KEEPLI ttl 1 cct=0000 <INFO S0 R0>:
      11:43:22R WD5CFJ-7>WA5EOC-7 Port=5 <I C P S4 R4> NET/ROM
      WD5CFJ-7 to KEEPLI ttl 1 cct=0000 <INFO S0 R0>:
      11:43:22R WD5CFJ-7>WA5EOC-7 Port=5 <RR R F R5>
      11:43:22R WA5EOC-7>WD5CFJ-7 Port=5 <RR R F R5>
      11:44:32T N5MDT-13>WD5CFJ-7 Port=5 <RR C P R1>
      11:44:33R WD5CFJ-7>N5MDT-13 Port=5 <RR R F R0>
      11:44:55T N5MDT-13>WA5EOC-7 Port=5 <RR C P R1>
      11:44:56R WA5EOC-7>N5MDT-13 Port=5 <RR R F R0>
      11:45:56R WA5EOC-7>N5MDT-13 Port=5 <I C P S1 R0> NET/ROM
      WA5EOC-7 to KEEPLI ttl 1 cct=0000 <INFO S0 R0>:
      11:45:56T N5MDT-13>WA5EOC-7 Port=5 <RR R F R2>
      11:46:35T N5MDT-13>WD5CFJ-7 Port=5 <RR C P R1>
      11:46:38R WD5CFJ-7>N5MDT-13 Port=5 <RR R F R0>
      11:47:33R WD5CFJ-7>N5MDT-13 Port=5 <I C P S1 R0> NET/ROM
      WD5CFJ-7 to KEEPLI ttl 1 cct=0000 <INFO S0 R0>:
      --------------------------

      In addition to the above each station is transmitting the NODES list. I'm wondering if all this traffic is necessary and if not, how do we correctly reduce the amount of traffic transmitted over the vhf frequencies.

      Thanks
      Mark

      ps. Still looking for suggestions on what HF frequency to park on for Winmor and Pactor. I do not have any forwarding partners on HF yet so I am open to anything.

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