Cisco Nexus 5000 Series Switch Fabric Manager Software Configuration Guide, NX-OS 4.0 (OL-16598-01, June 2008)

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10-11
Nexus 5000 Series Switch Fabric Manager Software Configuration Guide
OL-16598-01
Chapter 10 Configuring Fibre Channel Interfaces
Configuring Fibre Channel Interfaces
See the Cisco Nexus 5000 Series Family CLI Configuration Guide to configure frame encapsulation on
an interface.
Configuring Receive Data Field Size
You can configure the receive data field size for native Fibre Channel interfaces (but not for virtual Fibre
Channel interfaces). If the default data field size is 2112 bytes, the frame length will be 2148 bytes.
To configure the receive data field size using Fabric Manager, perform this task:
Step 1 In the Physical Attributes pane, expand Switches > Interfaces, and then choose FC Physical.
You see the interface configuration in the Information pane.
Step 2 Click the Other tab and set the RxDataFieldSize field (see Figure 10-4).
Figure 10-4 Changing Rx Data Size
Step 3
Click Apply Changes.
Understanding Bit Error Thresholds
The bit error rate threshold is used by the switch to detect an increased error rate before performance
degradation seriously affects traffic.
The bit errors can occur for the following reasons:
• Faulty or bad cable.
• Faulty or bad GBIC or SFP.
• GBIC or SFP is specified to operate at 1 Gbps but is used at 2 Gbps.
• GBIC or SFP is specified to operate at 2 Gbps but is used at 4 Gbps.
• Short haul cable is used for long haul or long haul cable is used for short haul.