Fibre Channel Over Ethernet Support; Protocol Offload; Quality Of Service - Cisco Nexus 6000 Series Configuration Manual

Configuring the Fabric Extender

Fibre Channel over Ethernet Support

The Cisco Nexus 2232PP and Cisco Nexus 2248PQ support Fibre Channel over Ethernet (FCoE) with the
following restrictions:
• Only FCoE Initialization Protocol (FIP) enabled converged network adapters (CNAs) are supported on
• Binding to a port channel is limited to only one member in the port channel.
For configuration details, see the Fibre Channel over Ethernet Configuration Guide for the Nexus software
release that you are using. The available versions of this document can be found at the following URL:
/www.cisco.com/en/US/products/ps9670/products_installation_and_configuration_guides_list.html.

Protocol Offload

To reduce the load on the control plane of the Cisco Nexus Series device, Cisco NX-OS allows you to offload
link-level protocol processing to the Fabric Extender CPU. The following protocols are supported:
• Link Layer Discovery Protocol (LLDP)
• Cisco Discovery Protocol (CDP)
• Link Aggregation Control Protocol (LACP)

Quality of Service

The Fabric Extender provides two user queues for its quality-of-service (QoS) support, one for all no-drop
classes and one for all drop classes. The classes configured on its parent switch are mapped to one of these
two queues; traffic for no-drop classes is mapped to one queue and traffic for all drop classes is mapped to
the other. Egress policies are also restricted to these two classes.
The Cisco Nexus Series device provides two predefined type qos class maps for matching broadcast or multicast
traffic; class-all-flood and class-ip-multicast. These classes are ignored on the Fabric Extender.
The Fabric Extender uses IEEE 802.1p class of service (CoS) values to associate traffic with the appropriate
class. Per-port quality of service (QoS) configuration and CoS-based egress queuing are also supported.
Host interfaces support pause frames, which are implemented using IEEE 802.3x link-level flow control
(LLC). By default, flow control send is on and flow control receive is off on all host interfaces. Autonegotiation
is enabled on the host interfaces. Per-class flow control is set according to the QoS classes.
Host interfaces support jumbo frames (up to 9216 bytes); however, a per-host interface maximum transmission
unit (MTU) is not supported. Instead, MTU is set according to the QoS classes. You modify MTU by setting
policy and class maps on the parent switch. Because the Fabric Extender has only two user queues, the MTU
for the drop-queue is set to the maximum MTU of all drop classes and the MTU on the no-drop queue is set
to the maximum MTU of all no-drop classes.
For more information about LLC and quality-of-service, see the Quality of Service Configuration Guide for
your device.
the Fabric Extender.
Cisco Nexus 6000 Series NX-OS Layer 2 Switching Configuration Guide, Release 7.x
Fibre Channel over Ethernet Support
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