Cisco Nexus 5000 Series Switch CLI Software Configuration Guide (OL-16597-01, July 2009)

Disabling LAN Traffic on an FCoE Link
You can disable LAN traffic on an FCoE link.
DCBX allows the switch to send a LAN Logical Link Status (LLS) message to a directly-connected CNA.
Enter the shutdown lan command to send an LLS-Down message to the CNA. This command causes all
VLANs on the interface that are not enabled for FCoE to be brought down. If a VLAN on the interface is
enabled for FCoE, it continues to carry SAN traffic without any interruption.
Procedure
PurposeCommand or Action
Enters configuration mode.switch# configure terminal
Step 1
Specifies an interface to configure, and enters interface
configuration mode.
switch(config)# interface ethernet
slot/port
Step 2
Shuts down Ethernet traffic on the interface. If the
interface is part of an FCoE VLAN, the shutdown has
no impact on the FCoE traffic.
switch(config-if)# shutdown lan
Step 3
(Optional)
Reenables Ethernet traffic on the interface.
switch(config-if)# no shutdown lan
Step 4
Configuring the FC-Map
You can prevent data corruption due to cross-fabric talk by configuring an FC-Map which identifies the Fibre
Channel fabric for this Cisco Nexus 5000 Series switch. When the FC-Map is configured, the switch discards
the MAC addresses that are not part of the current fabric.
Procedure
PurposeCommand or Action
Enters configuration mode.switch# configure terminal
Step 1
Configures the global FC-Map. The default value
is 0E.FC.00. The range is from 0E.FC.00 to
0E.FC.FF.
switch(config)# fcoe fcmap fabric-map
Step 2
(Optional)
Resets the global FC-Map to the default value of
0E.FC.00.
switch(config)# no fcoe fcmap
fabric-map
Step 3
This example shows how to configure the global FC-Map:
switch# configure terminal
switch(config)# fcoe fcmap 0e.fc.2a
Cisco Nexus 5000 Series Switch CLI Software Configuration Guide
OL-16597-01 405
Configuring FCoE
Disabling LAN Traffic on an FCoE Link