morris@windom.UCAR.EDU (Don Morris) (10/31/90)
We have a cisco AGS+ 8.1(21) with GS Software (GS2-F) that has 2 FDDI boards. We have this connected to an NSC FE649 box that also has 2 FDDI cards. (This is the start of an FDDI test network we are setting up). So, we have 2 separate FDDI rings to each box. Now when we ping the cisco from the NSC on ring 1 we get a certain RTT. If we diconnect ONE of the (two) optical cables from the cisco on ring 2, the ping RTT increases by a factor of 2. Disconnect both ring 2 cables and ping RTT increases a factor of 4. In addition, "break" ring 1 by disconnecting one of cables and ping RTT increases by factor of 6. If we disable ring 2 in the cisco with the CMT command "cmt discinnect fddi 0", the ping rate returns to normal. Disconnecting the ring 2 cables on the NSC box has no effect. Any ideas? Is this evidence of a bug and will it hurt anything?