Configuring a FEX with a Layer 3 Host Interface
This example shows how to configure a Fabric Extender with a Layer 3 host interface (at the interface level,
subinterface level, port channel level, and port channel subinterface level):
Layer 3 Sub-interface ConfigurationLayer 3 Configuration
config t
interface ethernet 101/1/1.12
ip address 192.0.2.1/24
encapsulation dot1Q 12
mtu 850
no shutdown
config t
interface ethernet 101/1/1
no switchport
ip address 192.0.1.1/24
Mtu 9000
no shutdown
Layer 3 Host Interface Port Channel Sub-interface
Configuration
Layer 3 Host Interface Port Channel Configuration
config t
interface ethernet 101/1/1-2
no switchport
channel-group 12
no shutdown
interface port-channel 12.14
ip address 192.0.4.1/24
encapsulation dot1Q 14
mtu 1700
no shutdown
config t
interface ethernet 101/1/1-2
no switchport
channel-group 12
no shutdown
interface port-channel 12
ip address 192.0.3.1/24
mtu 2000
no shutdown
The VLAN used in the Layer 3 host interface (HIF) or host interface port channel (HIFPC) subinterface
has only local significance to its parent interface. The same VLAN ID can be reused between Layer 3
subinterfaces in the same switch or VDC.
Note
Configuring a Host Interface in a vPC Topology Connected to Two FEXs
This example shows how to configure a host vPC with a FEX (host vPC attached to 2 different FEXs):
Switch 2 ConfigurationSwitch 1 Configuration
config t
feature lacp
int e101/1/1-2
channel-group 12 mode active
no shutdown
Int port-channel10
switchport
switchport mode trunk
switchport trunk allowed vlan 1-20
vpc 10
config t
feature lacp
int e101/1/1-2
channel-group 12 mode active
no shutdown
Int port-channel10
switchport
switchport mode trunk
switchport trunk allowed vlan 1-20
vpc 10
Cisco Nexus 2000 Series NX-OS Fabric Extender Software Configuration Guide
24 OL-25816-02
Configuring the Fabric Extender
Configuration Examples
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