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Cisco Nexus 5000 Series Switch CLI Software Configuration Guide
OL-16597-01
Chapter 1 Configuring FCoE
Configuring FCoE
The following rules determine whether the negotiation results in a capability being enabled:
• If a capability and its configuration values match between the switch and the adapter, the feature is
enabled.
• If the capability matches, but the configuration values do not match:
–
If the adapter is configured to accept the switch configuration value, the capability is enabled
using the switch value.
–
If the adapter is not configured to accept the switch configuration value, the capability remains
disabled.
• If the adapter does not support the DCBX capability, the capability remains disabled.
• If the adapter does not implement DCBX, all capabilities remain disabled.
Note The Cisco Nexus 5000 Series switch provides CLI commands to manually override the results of the
negotiation with the adapter. On a per-interface basis, you can force capabilities to be enabled or
disabled. For additional information, see the “Configuring FCoE” section on page 1-4.
Ethernet Frame Formats
Ethernet frames sent by the switch to the adapter may include the IEEE 802.1Q tag. This tag includes a
field for the CoS value used by PFC. The IEEE 802.1Q tag also includes a VLAN field, currently not
used by the Cisco Nexus 5000 Series switch.
The switch will always accept tagged or untagged frames from the adapter.
If the FCoE capability is enabled between the switch and the adapter:
• All Ethernet frames sent to the adapter include IEEE 802.1Q tags.
–
The VLAN ID field is always set to 0.
–
The CoS field is set to the CoS value of the associated system class. For additional information,
see the “System Classes” section on page 1-2.
• The switch accepts tagged or untagged frames from the adapter.
If the FCoE capability is disabled between the switch and the adapter:
• Ethernet frames sent to the adapter do not include IEEE 802.1Q tags.
• The switch accepts tagged or untagged frames from the adapter.
Configuring FCoE
This section contains the following topics:
• Enabling FCoE, page 1-5
• Enabling FCoE on Ethernet Interfaces, page 1-5
• Configuring Priority Flow Control, page 1-6
• Configuring IEEE 802.3x Link-Level Flow Control, page 1-6
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