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- **********************************************************************
- DDN MGT Bulletin 73 DCA DDN Defense Communications System
- 24 May 90 Published by: DDN Network Info Center
- (NIC@NIC.DDN.MIL) (800) 235-3155
-
-
- DEFENSE DATA NETWORK
-
- MANAGEMENT BULLETIN
-
- The DDN MANAGEMENT BULLETIN is distributed online by the DDN Network
- Information Center under DCA contract as a means of communicating
- official policy, procedures and other information of concern to
- management personnel at DDN facilities. Back issues may be read
- through the TACNEWS server ("@n" command at the TAC) or may be
- obtained by FTP (or Kermit) from the NIC.DDN.MIL host [192.67.67.20]
- using login="anonymous" and password="guest". The pathname
- for bulletins is DDN-NEWS:DDN-MGT-BULLETIN-nn.TXT (where "nn" is the
- bulletin number).
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-
-
- PSN 8.0 CONGESTION CONTROL
-
-
- SUMMARY:
-
- The Defense Communications Agency (DCA) enabled the PSN 8.0 congestion
- control mechanism on the MILNET on 19 May 1990 at 0900 EDT.
-
- BACKGROUND:
-
- The Defense Communications Agency began a phased deployment of Packet
- Switch Node Software Release 8.0 (PSN 8.0) on the MILNET in August
- 1989. PSN 8.0 contains several improvements including, most notably,
- congestion control. Congestion control improves subscriber host
- utilization of the subnetwork by alleviating subnetwork congestion.
- PSN 8.0 manages subnetwork congestion by controlling the data input
- rate from hosts attempting to use congested subnetwork resources.
-
- DCA ACTION:
-
- At this time, all MILNET Packet Switch Nodes contain PSN 8.0. On 19
- May 1990 at 0900 EDT, DCA enabled the PSN 8.0 congestion control
- mechanism on MILNET. Contingency plans have been in effect and DCA
- will disable congestion control for anomalous subnetwork activity or
- subscriber host degradation verified as relating to congestion
- control.
-
- SUBSCRIBER ACTION:
-
- No subscriber action is necessary for the enabling of congestion
- control. DCA anticipates that neither subscribers' hosts nor
- subscribers' perception of network utilization will be affected.
- Subscribers should follow their normal operational and trouble
- reporting procedures.
-