A MetroE connection to upstream. MUX and Routers at both end are hardcoded 100Mbps/Full-duplex.
Noticed intermittent high latency when ping both ways and icmp packet drops (only getting 98%) and this happens 24x7 during high or very-low link utilization - also file transfer is slow. "show interface" of the router interface connected to MUX shows an accumulating "input queue drops".
A technician perform loopback test MUX-to-MUX, found NO ERROR. When upstream plug their router to MUX and laptop is use to plug to the MUX in other end (hardcoded 100Mbps/Full-duplex), the problem still exist.
I already run through this http://www.cisco.com/en/US/products/hw/routers/ps133/products_tech_note09186a0080094791.shtml and nothing applies
Now technician want to replace the MUX.
Has anyone experience the same and is it a MUX problem? Any input?