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To create a loopback interface and enter interface configuration mode, use the interface loopback command. To remove a loopback interface, use the no form of this command.
interface loopback number
no interface loopback number
number |
Interface number. The range is from 0 to 1023. |
None
Global configuration mode
Release |
Modification |
---|---|
6.0(2)N1(1) |
This command was introduced. |
Use the interface loopback command to create or modify loopback interfaces.
From the loopback interface configuration mode, the following parameters are available:
This example shows how to create a loopback interface:
switch(config)# interface loopback 50 switch(config-if)# ip address 10.1.1.1/24 switch(config-if)#
Command |
Description |
---|---|
show interface loopback |
Displays information about the traffic on the specified loopback interface. |
To enter the management interface configuration mode, use the interface mgmt command.
interface mgmt mgmt-intf-num
mgmt-intf-num |
Management interface number. The interface number is 0. |
None
Global configuration mode
Release |
Modification |
---|---|
6.0(2)N1(1) |
This command was introduced. |
This example shows how to enter the management interface configuration mode:
switch# configure terminal switch(config)# interface mgmt 0 switch(config-if)#
Command |
Description |
---|---|
show interface mgmt |
Displays information about the management interface. |
cdp enable |
Enables the Cisco Discovery Protocol (CDP) on an interface. |
description (interface) |
Adds a description to an interface configuration. |
duplex |
Configures the duplex mode for an interface. |
lldp (interface) |
Enables the reception or transmission of Link Layer Discovery Protocol (LLDP) packets on an interface. |
rate-limit cpu direction |
Configures the packet per second (PPS) rate limit for an interface. |
snmp trap link-status |
Enables Simple Network Management Protocol (SNMP) link trap generation on an interface. |
speed |
Configures the transmit and receive speed for an interface. |
vrf member |
Adds an interface to a virtual routing and forwarding (VRF) instance. |
To create an EtherChannel interface and enter interface configuration mode, use the interface port-channel command. To remove an EtherChannel interface, use the no form of this command.
interface port-channel channel-number [ . subintf-channel-no ]
no interface port-channel channel-number [ . subintf-channel-no ]
channel-number |
Channel number that is assigned to this EtherChannel logical interface. The range is from 1 to 4096. |
||
. |
(Optional) Subinterface separator.
|
||
subintf-channel-no |
(Optional) Port number of the EtherChannel subinterface. The range is from 1 to 4093.
|
None
Global configuration mode
Interface configuration mode
Release |
Modification |
---|---|
6.0(2)N1(1) |
This command was introduced. |
A port can belong to only one channel group.
When you use the interface port-channel command for Layer 2 interfaces, follow these guidelines:
You must use the no switchport command in the interface configuration mode to configure the EtherChannel interface as a Layer 3 interface. When you configure the interface as a Layer 3 interface, all Layer 2-specific configurations on this interface are deleted.
Use the switchport command to convert a Layer 3 EtherChannel interface into a Layer 2 interface. When you configure the interface as a Layer 2 interface, all Layer 3-specific configurations on this interface are deleted.
You can configure one or more subinterfaces on a port channel made from routed interfaces.
This example shows how to create an EtherChannel group interface with channel-group number 50:
switch(config)# interface port-channel 50 switch(config-if)#
This example shows how to create a Layer 3 EtherChannel group interface with channel-group number 10:
switch(config)# interface port-channel 10 switch(config-if)# no switchport switch(config-if)# ip address 192.0.2.1/24 switch(config-if)#
This example shows how to configure a Layer 3 EtherChannel subinterface with channel-group number 1 in interface configuration mode:
switch(config)# interface port-channel 10 switch(config-if)# no switchport switch(config-if)# interface port-channel 10.1 switch(config-subif)# ip address 192.0.2.2/24 switch(config-subif)#
This example shows how to configure a Layer 3 EtherChannel subinterface with channel-group number 20.1 in global configuration mode:
switch(config)# interface port-channel 20.1 switch(config-subif)# ip address 192.0.2.3/24 switch(config-subif)#
Command |
Description |
---|---|
encapsulation |
(Layer 3 interfaces) Sets the encapsulation type for an interface. |
ip address |
(Layer 3 interfaces) Sets a primary or secondary IP address for an interface. |
no switchport |
(Layer 3 interfaces) Configures an interface as a Layer 3 interface. |
show interface |
Displays configuration information about interfaces. |
show lacp |
Displays LACP information. |
show port-channel summary |
Displays information about the EtherChannels. |
vtp (interface) |
Enables VLAN Trunking Protocol (VTP) on an interface. |
To configure the Linecard Expansion Module (LEM) in 10G mode, use the interface breakout command. To configure the Linecard Expansion Module (LEM) in 40G mode, use the no form of this command.
slot-number |
The range is from 1 to 8. |
port-range |
The range is from 1 to 12. |
40G mode
Global configuration mode
Release |
Modification |
---|---|
6.0(2)N1(1) |
This command was introduced. |
You can use this command to configure a LEM in 10G mode and 40G mode.
This example shows how to configure a LEM in 10G mode:
switch# configure terminal switch(config)# interface breakout slot 1 port 1-12 map 10g-4x
This example shows how to configure a LEM in 40G mode:
switch# configure terminal switch(config)# no interface breakout slot 1 port 1-12 map 10g-4x
Command |
Description |
---|---|
show interface capabilities |
Displays detailed information about the capabilities of an interface. |
To enter interface configuration mode for an Ethernet IEEE 802.3 interface, use the interface ethernet command.
interface ethernet [ chassis_ID / ] slot / [ QSFP-module / ] port
chassis_ID |
(Optional) Fabric Extender chassis ID. The chassis ID is from 100 to 199.
|
||
slot |
Slots from 1 to 8. The following list defines the slots available:
|
||
QSFP-module |
(Optional) The Linecard Expansion Module that has been set to 10G mode. The QSFP-module number is from 1 to 12. |
||
port |
Port number within a particular slot. The port number is from 1 to 128. |
None
Global configuration mode
Release |
Modification |
---|---|
6.0(2)N1(1) |
This command was introduced. |
This example shows how to enter configuration mode for Ethernet interface 1/4:
switch(config)# interface ethernet 1/4 switch(config-if)#
This example shows how to enter configuration mode for a host interface on a Fabric Extender:
switch(config)# interface ethernet 101/1/1 switch(config-if)#
This example shows how to enter configuration mode for LEM 1/2/1:
switch(config)# interface ethernet 1/2/1 switch(config-if)#
Command |
Description |
---|---|
interface vethernet |
Configures a virtual Ethernet interface. |
show fex |
Displays all configured Fabric Extender chassis connected to the switch. |
show interface ethernet |
Displays various parameters of an Ethernet IEEE 802.3 interface. |
speed |
Sets the speed on the interface. |
vtp (interface) |
Enables VLAN Trunking Protocol (VTP) on an interface. |
To configure a Layer 3 Ethernet IEEE 802.3 routed interface, use the interface ethernet command.
interface ethernet [ chassis_ID] slot[ QSFP-module1] port
chassis_ID |
(Optional) Fabric Extender chassis ID. The chassis ID is from 100 to 199.
|
||
slot |
Slots from 1 to 8. The following list defines the slots available: |
||
QSFP-module |
(Optional) Linecard Expansion Module (LEM) that has been set to 10G mode. |
||
port |
Port number within a particular slot. The port number is from 1 to 128. |
||
. |
(Optional) Subinterface separator. |
||
subintf-port-no |
(Optional) Port number for the subinterface. The range is from 1 to 48. |
None
Global configuration modeInterface configuration mode
Release |
Modification |
---|---|
6.0(2)N1(1) |
This command was introduced. |
You must use the no switchport command in the interface configuration mode to configure the interface as a Layer 3 routed interface. When you configure the interface as a Layer 3 interface, all Layer 2-specific configurations on this interface are deleted.
Use the switchport command to convert a Layer 3 interface into a Layer 2 interface. When you configure the interface as a Layer 2 interface, all Layer 3-specific configurations on this interface are deleted.
This example shows how to enter configuration mode for Layer 3 Ethernet interface 1/5:
switch(config)# interface ethernet 1/5 switch(config-if)# no switchport switch(config-if)# ip address 10.1.1.1/24 switch(config-if)#
This example shows how to configure a Layer 3 subinterface for Ethernet interface 1/5 in the global configuration mode:
switch(config)# interface ethernet 1/5.2 switch(config-if)# no switchport switch(config-subif)# ip address 10.1.1.1/24 switch(config-subif)#
This example shows how to configure a Layer 3 subinterface in interface configuration mode:
switch(config)# interface ethernet 1/5 switch(config-if)# no switchport switch(config-if)# interface ethernet 1/5.1 switch(config-subif)# ip address 10.1.1.1/24 switch(config-subif)#
This example shows how to convert a Layer 3 interface to a Layer 2 interface:
switch(config)# interface ethernet 1/5 switch(config-if)# no switchport switch(config-if)# ip address 10.1.1.1/24 switch(config-if)# switchport switch(config-if)#
Command |
Description |
---|---|
bandwidth |
Sets the bandwidth parameters for an interface. |
delay |
Configures the interface throughput delay value. |
encapsulation |
Sets the encapsulation type for an interface. |
ip address |
Sets a primary or secondary IP address for an interface. |
inherit |
Assigns a port profile to an interface. |
interface vethernet |
Configures a virtual Ethernet interface. |
no switchport |
Configures an interface as a Layer 3 interface. |
service-policy |
Configures a service policy for an interface. |
show fex |
Displays all configured Fabric Extender chassis connected to the switch. |
show interface ethernet |
Displays various parameters of an Ethernet IEEE 802.3 interface. |