[c-nsp] Strange drops on 6500

[lists at hojmark.org]

> There's a chain of Cat6000
> 1    2  Cat 6k sup 1 Enhanced QoS (Active)     WS-X6K-SUP1A-2GE   
> 2    2  Cat 6k sup 1 Enhanced QoS (Standby)    WS-X6K-SUP1A-2GE   
> 3    8  8 port 1000mb GBIC Enhanced QoS        WS-X6408A-GBIC     
> 
> running 12.1(8a)EX and connected by longhaul fibers.

Oh boy that is old software...

You should get that software upgraded to something reasonably
current (12.1(latest)E should be fine), and just then resume
troubleshooting.

There's in the order of 2 gazillion bugs, which have been fixed
between 12.1(ancient)EX end 12.1(recent)E, including several
directly related to incorrect counters.

-A