What to do if Cisco Network Router has poor performance?
- TtsolisJul 30, 2025
Poor performance or excessive errors in a Cisco Network Router can stem from several causes. One potential cause is a duplex autonegotiation mismatch; refer to the switch software configuration guide for details on identifying these mismatches. Another cause can be exceeding cabling distance or port statistics showing excessive frame check sequence (FCS), late-collision, or alignment errors; in this case, refer to the switch software configuration guide for displaying port statistics and your SFP documentation for cabling guidelines. Finally, a bad adapter in the attached device, indicated by excessive errors in port statistics, can be the cause; run the adapter card diagnostic utility to resolve this.