Cisco me-4924-10ge 安装指导

下载
页码 74
   
4-2
Cisco ME 4924-10GE Ethernet Switch Hardware Installation Guide
OL-10071-01
Chapter 4      Troubleshooting
    Diagnosing Problems
Diagnosing Problems
Common switch problems fall into these categories:
Poor performance
No connectivity
Corrupted software
 describes how to detect and resolve these problems.
Table 4-1
Common Problems and Solutions
Symptom
Possible Cause
Resolution
Poor performance or excessive 
errors
Duplex autonegotiation mismatch.
Refer to the switch software 
configuration guide for 
information on identifying 
autonegotiation mismatches.
Cabling distance exceeded
Port statistics show excessive 
frame check sequence (FCS), 
late-collision, or alignment 
errors.
For SFP port connections:
The distance between the 
SFP port and the attached 
device exceeds the SFP 
cabling guidelines.
Refer to the switch software 
configuration guide for 
information on displaying 
port statistics.
Refer to your SFP 
documentation for cabling 
guidelines.
Bad adapter in attached device
Excessive errors found in port 
statistics.
Run adapter card diagnostic 
utility.
No connectivity
Incorrect or bad cable
These are results of no link at both 
ends:
A crossover cable was used 
when a straight-through was 
required, or the reverse.
The cable is wired incorrectly.
A crossover or straight-through 
cable is wired incorrectly.
For the correct pinouts and 
the proper application of 
crossover vs. 
straight-through cables, see 
the 
.
Replace with a tested good 
cable.
For 1000BASE-T 
connections, be sure to use 
a twisted four-pair, 
Category 5 cable.