jseeger@BBN.COM (12/24/88)
Gene, et. al., Bob Pyle who studies ARPANET performance all the time and KNOWS this network well, sent me the following message in response to my forwarding him yours of Wednesday, 21 December 1988 12:34:29 EST. He starts with a copy of your message. His words follow at the end. ------- Forwarded Message To: gswallow@BBN.COM, jwiggins@BBN.COM, hinden@BBN.COM, jseeger@BBN.COM Subject: Don't panic, it's not true Date: Thu, 22 Dec 88 09:40:05 -0500 From: Robert Pyle BBNCC 20/672 x3518 <rpyle@BBN.COM> - ------- Forwarded Message (edited down in size) Date: Wednesday, 21 December 1988 12:34:29 EST From: Gene.Hastings@boole.ece.cmu.edu Reply-To: hastings@morgul.psc.edu Subject: Possible ARPA segmentation next week? Danger, Will Robinson! Arpanet PSN #14 (CMU) will be without power 2400 Tuesday 27 December until 2000 Thursday 29 December. My understanding of the current ARPA topology is that CMU is in the middle of the only cross-country land line, and that only the Wideband satellite link will connect the coasts, meaning that there will be high delays from coast to coast. Gene - ------- End of Forwarded Message Not so. The terrestrial path from RCC5 -> UROCH -> WISC -> SAC and westwards from there will exist (barring additional outages). What the CMU outage *will* do is break the DCEC - CMU - PURDU path, which is about the busiest part of ARPANET, mostly due to EGP-extra-hop traffic to and from PURDU. Next week should see the lowest traffic all year, and the Butterfly mailbridges are presumably already handling some traffic that used to be forwarded via PURDU, so I see no cause for alarm. Most coast-to-coast traffic already uses the various satellite lines anyway. Even some east-coast traffic currently takes routes like MIT-SRI-DCEC or BBN-ISI-DCEC via two satellite hops in preference to the multihop terrestrial path. --Bob ------- End of Forwarded Message