A WS-SUP32-GE-3B directly connected to a WS-6724-SFP, without any other devices or traffic, can report incrementing out-discards on the WS-SUP32-GE-3B every five seconds, and incrementing input errors or drop errors every 30 seconds on the WS-6724-SFP. If the WS-SUP32-GE-3B is connected directly to the WS-SUP720-3B, input errors or drops on the WS-SUP720-3B do not result, but Out-Discards still increment on the WS-SUP32-GE-3B.
This behavior is a result of a known Cisco bug ID CSCei40623, and is cosmetic. This bug is fixed in release 8.4(4) and later.
Note: The workaround for input errors and drops on the 7613 is to configure the ports on the directly connected link to the WS-SUP32-GE-3B as hosts. However Out-Discards still increment on the WS-SUP32-GE-3B.