Fcoe Topologies; Directly Connected Cna Topology - Cisco AP775A - Nexus Converged Network Switch 5010 Configuration Manual

Directly Connected CNA Topology

To reduce configuration errors and simplify administration, the switch distributes the configuration data to
all the connected adapters.

FCoE Topologies

Directly Connected CNA Topology
The Cisco Nexus 5000 Series switch can be deployed as a Fibre Channel Forwarder (FCF) as shown in the
following figure.
Figure 39: Directly Connected Fibre Channel Forwarder
The following rules are used to process FIP frames to avoid the FCF being used as a transit between an FCoE
node (ENode) and another FCF. These rules also prevent login sessions between ENodes and FCFs in different
fabrics.
• FIP solicitation and login frames received from the CNAs are processed by the FCF and are not forwarded.
• If an FCF receives solicitations and advertisements from other FCFs over an interface, the following
CNAs cannot discover or login to FCFs that are reachable only through a transit Cisco Nexus 5000 Series
FCF. The Cisco Nexus 5000 Series switch cannot perform the FCoE transit function between a CNA and
another FCF due to hardware limitations.
Because the Cisco Nexus 5000 Series FCF cannot perform the transit FCoE function, you must design your
network topology so that the active STP path of FCoE VLANs is always over the directly connected links
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occurs:
◦ The frames are ignored and discarded if the FC-MAP value in the frame matches the value of the
FCF (the FCF is in the same fabric)
◦ The interface is placed in the "FCoE Isolated" state if the FC-MAP value in the FIP frame does
not match that of the FCF (the FCF is in a different fabric)
FCoE Topologies
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