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1-9
Cisco MDS 9000 Family Troubleshooting Guide, Release 3.x
OL-9285-05
Chapter 1 Troubleshooting Overview
Primary Troubleshooting Flowchart
• Configure (enable or disable restrictions on oversubscription ratios and bandwidth fairness)
• Check port group oversubscription (display includes group and ports, port speed, and send and
receive speed and includes possible oversubscription indicators)
• Show port resources
• Reset the module
Note Port group oversubscription is supported on 24-port and 48-port 4-Gbps Fibre Channel switching
modules, the 32-port 2-Gbps Fibre Channel switching module, the Cisco MDS 9120 20-port 1/2-Gbps
Fibre Channel module, and the Cisco MDS 9140 40-port 1/2-Gbps Fibre Channel module.
Primary Troubleshooting Flowchart
The flowchart in Figure 1-3 shows the overall troubleshooting process. Begin any troubleshooting
investigation by checking one of the following four areas:
• Physical port issues
• Physical switch issues
• Fx port issues
• Fabric services
Figure 1-3 Troubleshooting Process Flowchart
Physical port
issues
Port state
Analyze link
events
Hardware
Flapping
Fabric services
issues
Name server
Zoning
FSPF
Domain
Manager
EISL,
PortChannel
VSAN
Fx port
FLOGI
Host HBA
Device HBA
Physical switch
issues
Modules up?
Hardware
issues?
Software image
issues
Power
Environment
144817
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