hassler@asd.wpafb.af.MIL (Barry D. Hassler) (09/15/88)
A few quick questions concerning Logical Host addressing: First, is anyone using this currently? I know of the definition of how it is to be done on the X25 connections to the net. Furthermore, If a single host has two physical connections to the net and both use the same logical address, how does the PSN route traffic between the two links? Is it load balanced? Barry D. Hassler Control Data Corporation Integration Services Division
malis@MACARTHUR.BBN.COM (Andy Malis) (09/19/88)
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
zweig@p.cs.uiuc.edu (09/26/88)
/* Written 8:47 am Sep 15, 1988 by hassler@asd.wpafb.af.MIL in p.cs.uiuc.edu:comp.protocols.tcp-ip */ /* ---------- "Class A Logical Host Addressing" ---------- */ A few quick questions concerning Logical Host addressing: First, is anyone using this currently? I know of the definition of how it is to be done on the X25 connections to the net. Furthermore, If a single host has two physical connections to the net and both use the same logical address, how does the PSN route traffic between the two links? Is it load balanced? Barry D. Hassler Control Data Corporation Integration Services Division /* End of text from p.cs.uiuc.edu:comp.protocols.tcp-ip */