Since the 878 router doesnt have any optical ports on it, you will have to termiate that link on a local switch (if the switch has optics on it).
If the switch also doesnt the compatible optics/or no optics then your best best to to purchase a good quality media convertor and connect the incoming fiber to the router via copper (this wont disable or degrade any functionality).
Introduction: The "external-out enable" command is available for
configuration under the "router ospf process" in case of the IOS-XR
operating system. This command basically enables advertisement of
intra-area routes on the device as external routes in th...
IntroductionIn this article we'll discuss how to troubleshoot packet
loss in the asr9000 and specifically understanding the NP drop counters,
what they mean and what you can do to mitigate them. This document will
be an ongoing effort to improve troublesh...