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Cisco Nexus B22 Fabric Extender for HP Getting Started Guide
  Configuring the Cisco Nexus B22 Fabric Extender for HP
Associating a Fabric Extender to a Fabric Interface
A Fabric Extender is connected to the switch through physical Ethernet interfaces or an EtherChannel. 
By default, the switch does not allow the attached Fabric Extender to connect until it has been assigned 
a chassis ID and is associated with the connected interface.
Note The Fabric Extender may connect to the switch through a number of separate physical Ethernet 
interfaces or at most one EtherChannel interface.
This section includes the following topics:
 • Associating a Fabric Extender to an Ethernet Interface, page 8
 • Associating a Fabric Extender to an EtherChannel, page 9
 • Disassociating a Fabric Extender from an Interface, page 10
Associating a Fabric Extender to an Ethernet Interface
To associate the Fabric Extender to an Ethernet interface, perform this task:
This example shows how to associate the Fabric Extender to an Ethernet interface on the switch:
switch# configure terminal
Enter configuration commands, one per line.  End with CNTL/Z.
switch(config)# interface ethernet 1/19
switch(config-if)# switchport mode fex-fabric 
switch(config-if)# fex associate 102 
This example shows how to display the association of the Fabric Extender and the switch:
switch# show interface ethernet 1/19 fex-intf
Fabric           FEX
Interface        Interfaces
---------------------------------------------------
 Eth1/19         Eth100/1/16   Eth100/1/15   Eth100/1/14   Eth100/1/13
                 Eth100/1/12   Eth100/1/11   Eth100/1/10   Eth100/1/9
                 Eth100/1/8    Eth100/1/7    Eth100/1/6    Eth100/1/5
                 Eth100/1/4    Eth100/1/3    Eth100/1/2    Eth100/1/1
Command Purpose
Step 1
switch# configure terminal 
Enters configuration mode.
Step 2
switch(config)# interface ethernet 
slot/port 
Specifies an Ethernet interface to configure. 
Step 3
switch(config-if)# switchport mode 
fex-fabric 
Sets the interface to support an external Fabric 
Extender. 
Step 4
switch(config-if)# fex associate chassis 
Associates the chassis ID to the Fabric Extender unit 
attached to the interface. The range of the chassis ID 
is from 100 to 199.
Step 5
switch# show interface ethernet 
port/slot fex-intf 
(Optional) Displays the association of a Fabric 
Extender to an Ethernet interface.