🚀 go-pugleaf

I am currently trying to setup a very simple FDDI ring using two cisco routers.
I have the routers setup in test scenerio where both routers and their
fiber cross-connects are in the same room and easily accessable. I have
no problem setting up the initial ring, the configuration is "thru A".
In testing when I disconnect either the A or B Phy completely from either
router the ring reconfigures to "wrap A" or "wrap B" properly and with
a very minimal delay. However if I disconnect a single fiber from any
of the phy's the router goes into the appropriate wrap state, but also
shows a Halt Line State (HLS) for the affected phy and cpu utilization
goes to 100%. The router then appears to remain in this state indefinitely.
I have been trying to determine what exactly is happening when the router
is in this state (i.e. is it stuck beaconing?, etc...) and I am curious
as to why the router remains in this braindamaged state. 
I would greatly appreciate any explanation for my current problem.