Path: utzoo!utgpu!water!watmath!clyde!att!osu-cis!tut.cis.ohio-state.edu!cwjcc!gatech!rutgers!mailrus!uwmcsd1!ig!agate!ucbvax!MACARTHUR.BBN.COM!malis From: malis@MACARTHUR.BBN.COM (Andy Malis) Newsgroups: comp.protocols.tcp-ip Subject: Re: Class A Logical Host Addressing Message-ID: <8809241114.AA19872@ucbvax.Berkeley.EDU> Date: 19 Sep 88 16:21:41 GMT References: <6.15925.8809161415@asd.wpafb.af.mil> Sender: daemon@ucbvax.BERKELEY.EDU Reply-To: malis@CC5.BBN.COM Organization: The Internet Lines: 28 Barry, As I believe Mike St. Johns mentioned a in an earlier message, the PSN's logical addressing capabilities are not currently in use by the DDN due to required changes to AHIP (1822) host software. A possible future PSN development will be to make logical addressing transparent for AHIP hosts as well as X.25 hosts. To answer your second question, the criterion used by the PSNs to choose between multiple available physical mappings for a logical address is configurable by the network administration on a per- logical-address basis. Three alternative criteria are available: ordered list, closest (via delay-based network routing), and load leveling (successive Call Requests are distributed through the list of currently available physical mappings in a round-robin manner). In the previous paragraph, "available" means the destination host port is up and the logical-address-to-physical-port mapping has been enabled, either explicitly by the host or automatically by the network when the host last restarted. Automatic enabling is itself configurable by the network administration on a per-host- port basis. Regards, Andy Malis BBNCC PSN Development