I Commands
- interface ethernet
- interface ethernet (Layer 3)
- interface loopback
- interface mgmt
- interface port-channel
interface ethernet
To enter interface configuration mode for an Ethernet IEEE 802.3 interface, use the interface ethernet command.
interface ethernet [ chassis_ID / ] slot / port
Syntax Description
chassis_ID |
(Optional) Specifies the Fabric Extender chassis ID. The chassis ID is from 100 to 199.
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slot |
Slot from 1 to 3. The following list defines the slots available:
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port |
Port number within a particular slot. The port number is from 1 to 128. |
Command Default
None
Command Modes
Global configuration mode
Command History
Release |
Modification |
---|---|
4.0(0)N1(1a) |
This command was introduced. |
4.0(1a)N2(1) |
This command was modified to provide the chassis ID argument. |
5.0(3)N1(1) |
Support for Layer 3 interfaces was added. |
Examples
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)#
Related Commands
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. |
interface ethernet (Layer 3)
To configure a Layer 3 Ethernet IEEE 802.3 routed interface, use the interface ethernet command.
interface ethernet [ chassis_ID / ] slot / port [ .subintf-port-no ]
Syntax Description
chassis_ID |
(Optional) Specifies the Fabric Extender chassis ID. The chassis ID is from 100 to 199.
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slot |
Slot from 1 to 3. The following list defines the slots available:
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port |
Port number within a particular slot. The port number is from 1 to 128. |
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. |
(Optional) Specifies the subinterface separator. |
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subintf-port-no |
(Optional) Port number for the subinterface. The range is from 1 to 48. |
Command Default
None
Command Modes
Global configuration modeInterface configuration mode
Command History
Release |
Modification |
---|---|
5.0(3)N1(1) |
This command was introduced. |
Usage Guidelines
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.
Examples
This example shows how to enter configuration mode for a 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)#
Related Commands
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. |
interface loopback
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
Syntax Description
number |
Interface number; valid values are from 0 to 1023. |
Command Default
None
Command Modes
Global configuration mode
Command History
Release |
Modification |
---|---|
5.0(3)N1(1) |
This command was introduced. |
Usage Guidelines
Use the interface loopback command to create or modify loopback interfaces.
From the loopback interface configuration mode, the following parameters are available:
- description—Provides a description of the purpose of the interface.
- ip—Configures IP features, such as the IP address for the interface, Address Resolution Protocol (ARP) attributes, load balancing, Unicast Reverse Path Forwarding (RPF) or IP Source Guard.
- logging—Configure logging of events.
- shutdown—Shut down traffic on the interface.
This command does not require a license.
Examples
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)#
Related Commands
Command |
Description |
---|---|
show interface loopback |
Displays information about the traffic on the specified loopback interface. |
interface mgmt
To enter the management interface configuration mode, use the interface mgmt command.
interface mgmt mgmt-intf-num
Syntax Description
mgmt-intf-num |
Management interface number. The interface number is 0. |
Command Default
None
Command Modes
Global configuration mode
Command History
Release |
Modification |
---|---|
4.0(0)N1(1a) |
This command was introduced. |
Examples
This example shows how to enter the management interface configuration mode:
switch# configure terminal switch(config)# interface mgmt 0 switch(config-if)#
Related Commands
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. |
interface port-channel
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 ]
Syntax Description
channel-number |
Channel number that is assigned to this EtherChannel logical interface. The range is from 1 to 4096. |
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. |
(Optional) Specifies the subinterface separator.
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subintf-channel-no |
(Optional) Port number of the EtherChannel subinterface. The range is from 1 to 4093.
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Command Default
None
Command Modes
Global configuration mode
Interface configuration mode
Command History
Release |
Modification |
---|---|
4.0(0)N1(1a) |
This command was introduced. |
5.0(3)N1(1) |
Support for Layer 3 interfaces and subinterfaces was added. |
Usage Guidelines
A port can belong to only one channel group.
When you use the interface port-channel command for Layer 2 interfaces, follow these guidelines:
- If you are using CDP, you must configure it only on the physical interface and not on the EtherChannel interface.
- If you do not assign a static MAC address on the EtherChannel interface, a MAC address is automatically assigned. If you assign a static MAC address and then later remove it, the MAC address is automatically assigned.
- The MAC address of the EtherChannel is the address of the first operational port added to the channel group. If this first-added port is removed from the channel, the MAC address comes from the next operational port added, if there is one.
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.
Examples
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)#
Related Commands
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 on the EtherChannels. |
vtp (interface) |
Enables VLAN Trunking Protocol (VTP) on an interface. |