sting@LAOTSE.CAM.NIST.GOV (s. ting) (02/06/91)
The ProNET-80 i/f of one of our p4200s on the ring failed late last Friday. It came back by itself around 3 pm Sunday's afternoon. Then it failed again yesterday afternoon. The router itself has been up all the time. We tried to find out what the source of this intermittent problem come from. As I remember, the results of "test i/f" under "t 5" were always successful according to the router under three different physical configurations: 1) a loopback plug on the p4200's pronet-80 i/f connector, 2) a loopback plug on the end of the pronet-80 black cable, and 3) the p4200 connected to p3280 through black-red cable. But, if we passively waited, then sooner or later the router would declare the i/f down. We swapped the p3280 and the red cable, nothing changed. We are reluctant to swap the ProNET-80 CTL board since we know the current CTL board is well aligned while our spare CTL boards are not. I would appreciate very much for any idea about the source of the problem and/or which part of the system may cause the problem. Michael Ting, NIST, (301) 975-3802