Interface Configuration

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Table of Contents

Table of Contents
Chapter 1 Overview.........................................................................................................................................1

1.1 Supported Interface Types.............................................................................................................. 1
1.2 Interface Configuration Introduction...............................................................................................1

Chapter 2 Interface Configuration.................................................................................................................3
2.1 Configuring Interface Common Attribute....................................................................................... 3

2.1.1 Adding Description.................................................................................................................3
2.1.2 Configuring Bandwidth..........................................................................................................3
2.1.3 Configuring Time Delay........................................................................................................ 3

2.2 Monitoring and Maintaining the Interface...................................................................................... 3
2.2.1 Browsing the state of an interface.......................................................................................4
2.2.2 Initializing and deleting the port...........................................................................................4
2.2.3 Closing and Restarting the Port...........................................................................................4

2.3 Setting the Ethernet Interface......................................................................................................... 4
2.3.1 Choosing an Ethernet Interface...........................................................................................4
2.3.2 Setting the Rate..................................................................................................................... 5
2.3.3 Setting the Duplex Mode of an Interface............................................................................5
2.3.4 Setting Flow Control on an Interface.................................................................................. 5

2.4 Configuring Logical Interface...........................................................................................................6
2.4.1 Configuring Aggregation Interface...................................................................................... 6
2.4.2 Configuring VLAN Interface................................................................................................. 6

Chapter 3 Interface Configuration Example................................................................................................ 7
3.1 Configuring Public Attribute of Interface........................................................................................7

3.1.1 Example for Interface Description....................................................................................... 7
3.1.2 Example of Interface Shutdown...........................................................................................7

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Interface Configuration

Chapter 1 Overview
This section helps user to learn various kinds of interface that our switch supports and consult
configuration information about different interface types.
For detailed description of all interface commands used in this section, refer to Interface
configuration command. For files of other commands appeared in this section, refer to other parts
of the manual.
The introduction includes communication information that can be applied to all interface types.
1.1 Supported Interface Types
For information about interface types, please refer to the following table.
Interface type Task Reference

Configures fast Ethernet interface.
Ethernet interface Configures gigabit Ethernet Setting the Ethernet Interface

interface.
Aggregation interface

Logical interface Configuring Logical Interface
VLAN interface

The two supported kinds of interface: Ethernet interface and logical interface. The Ethernet
interface type depends on one device depends on the standard communication interface and the
interface card or interfaced module installed on the switch. The logical interface is the interface
without the corresponding physical device, which is established by user manually.
The supported Ethernet interfaces of our switch include:
 Fast Ethernet
 Gigabit Ethernet interface
The supported logical interface of our switch include:
 Aggregation interface
 vlan interface
1.2 Interface Configuration Introduction
The following description applies to the configuration process of all interfaces. Take the following
steps to perform interface configuration in global configuration mode.
1) At this time, the switch prompt becomes ‘config_’ plus the shortened form of the interface to be

configured. Use these interfaces in terms of their numbers. Numbers are assigned during
installation (exworks) or when an interface card are added to the system. Run the show
interface command to display these interfaces. Each interface that the device supports
provides its own state as follows:

Switch_config#show interface g0/2
GigaEthernet0/2 is administratively down, line protocol is down

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Interface Configuration

Hardware is Giga-Combo-FX, address is 00e0.0f8d.e0e1 (bia 00e0.0f8d.e0e1)
MTU 1500 bytes, BW 10000 kbit, DLY 10 usec
Encapsulation ARPA
port info 1 0 2 1
Auto-duplex, Auto-speed
flow-control off

Received 0 packets, 0 bytes
0 broadcasts, 0 multicasts
0 discard, 0 error, 0 PAUSE
0 align, 0 FCS, 0 symbol
0 jabber, 0 oversize, 0 undersize
0 carriersense, 0 collision, 0 fragment
0 L3 packets, 0 discards, 0 Header errors
Transmited 0 packets, 0 bytes
0 broadcasts, 0 multicasts
0 discard, 0 error, 0 PAUSE
0 sqettest, 0 deferred
0 single, 0 multiple, 0 excessive, 0 late
0 L3 forwards

Note:
There is no need to add blank between interface type and interface number. For example, in the
above line, g 0/2 or g 0/2 is both available.

(1) You can configure the interface configuration commands in interface
configuration mode. Various commands define protocols and application
programs to be executed on the interface. These commands will stay until user
exits the interface configuration mode or switches to another interface.

(2) Once the interface configuration has been completed, use the show command in
the following chapter ‘Monitoring and Maintaining Interface’ to test the interface
state.

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Interface Configuration

Chapter 2 Interface Configuration
2.1 Configuring Interface Common Attribute
The following content describes the command that can be executed on an interface of any type and
configures common attributes of interface. The common attributes of interface that can be
configured include: interface description, bandwidth and delay and so on.
2.1.1 Adding Description
Adding description about the related interface helps to memorize content attached to the interface.
This description only serves as the interface note to help identify uses of the interface and has no
effect on any feature of the interface. This description will appear in the output of the following
commands: show running-config and show interface. Use the following command in interface
configuration mode if user wants to add a description to any interface.
Command Purpose
description string Adds description to the currently-configured interface.

For examples relevant to adding interface description, please refer to the following section
‘Interface Description Example’.
2.1.2 Configuring Bandwidth
The upper protocol uses bandwidth information to perform operation decision. Use the following
command to configure bandwidth for the interface:
Command Purpose
bandwidth kilobps Configures bandwidth for the currently configured

interface.

The bandwidth is just a routing parameter, which doesn’t influence the communication rate of the
actual physical interface.
2.1.3 Configuring Time Delay
The upper protocol uses time delay information to perform operation decision. Use the following
command to configure time delay for the interface in the interface configuration mode.
Command Purpose
delay tensofmicroseconds Configures time delay for the currently configured

interface.

The configuration of time delay is just an information parameter. Use this command cannot adjust
the actual time delay of an interface.
2.2 Monitoring and Maintaining the Interface
To maintain and monitor the interface, perform the following tasks:
 Browsing the state of an interface
 Initializing and deleting the port

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Interface Configuration

 Closing and restarting the port
2.2.1 Browsing the state of an interface
Our switches support those commands to display interface information, including the version ID of
hardware and software, and the interface state. The following table presents you some port monitor
commands: For more details, please refer to the "Interface Configuration Command".
Run the following commands:
Command Purpose
show interface [type [slot|port]] Displays the state of a port.
show running-config Displays the current settings.
show version Displays the memory configuration, the software

version and the startup mirror.

2.2.2 Initializing and deleting the port
The logic interface can be dynamically created and deleted. So it is with the sub-interface and the
channelized interface. The physical interface which cannot be deleted dynamically can return to the
default setting of the interface. In global configuration mode, run the following command to initialize
and delete an interface:
Command Purpose
no interface [type [slot|port]] Initializes a physical interface or deletes a virtual

interface.

2.2.3 Closing and Restarting the Port
You can disable the interface, so that all functions on this interface can be disabled, and then all
monitor commands will label this interface as unavailable. This information can be transmitted to
other devices through the dynamic routing protocol. The modification on any route will not affect
this port.
Run the following commands in interface configuration mode to shut down an interface and then
restart it.
Command Purpose
shutdown Disable the interface.
no shutdown Restarting the interface

To check whether an interface is shut down, you can run show interface and show running-config.
After the show interface command is run, a disabled interface will be presented as “administratively
down”. For more examples, please refer to "Interface Shutdown Example".
2.3 Setting the Ethernet Interface
In this section the procedure of setting the Ethernet interface will be described. The detailed
configuration includes the following steps, among which step 1 is obligatory while other steps are
optional.
2.3.1 Choosing an Ethernet Interface

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Interface Configuration

Run the following command in global configuration mode to enter the Ethernet interface
configuration mode:
Command Purpose
interface fastethernet [slot|port ] Enters the fast-Ethernet interface configuration mode.
interface gigaethernet [slot|port ] Enters the gigabit-Ethernet interface configuration mode.

The show interface fastethernet command can be used to show the state of the Ethernet interface,
while the show interface gigaethernet command can be used to show the state of the
gigabit-Ethernet interface.
2.3.2 Setting the Rate
The Ethernet rate can be realized not only through auto-negotiation but also through interface
configuration.
Command Purpose
Speed {10|100|1000|auto} Sets the rate of fast Ethernet to 10M, 100M, 1000M or

auto-negotiation.
No speed Resumes the default settings. The rate is auto-negotiation.

Note:
The speed of the optical interface varies with the device. For example, the speed of GE-FX is
1000M, while the speed of FE-FX is 100M. If the speed command for an optical interface has the
auto parameter, the optical interface has the automatic negotiation function, or the optical interface
is mandatory and cannot be negotiated. The gigabit TX port supports the working mode of 10M,
100M, 1000M. The gigabit TX port must work in auto mode. Do the configuration as the prompt of
each port.
2.3.3 Setting the Duplex Mode of an Interface
By default, the Ethernet interface can be auto, half duplex or full duplex. The duplex mode for the
gigbit interface is always auto.
Command Purpose
duplex {full|half|auto} Sets the duplex mode of an Ethernet interface.
No duplex Resumes the default settings. The duplex mode is

auto-negotiation.

2.3.4 Setting Flow Control on an Interface
When an interface is in full duplex mode, flow control is realized through the 802.3X-defined
PAUSE frame; when an interface is in half duplex mode, flow control is realized through
backpressure.
Command Purpose
flow-control on/off /auto Enables or disables flow control on an interface.
no flow-control Resumes the default settings, that is, there is no

flow control on an interface.

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Interface Configuration

2.4 Configuring Logical Interface
This section describes how to configure a logical interface. The contents are as follows:
Configuring aggregation interface
Configuring VLAN interface
2.4.1 Configuring Aggregation Interface

The aggregator interface is introduced in the background that the bandwidth of a single Ethernet

interface is insufficient. It can bind together multiple full-duplex interfaces of the same rate to

multiply the bandwidth.

Run the following command to define the aggregation interface:
Command Function

Interface port-aggregator number Configuring aggregation interface
2.4.2 Configuring VLAN Interface
VLAN interface is the routing interface in switch. The VLAN command in global configuration mode
only adds layer 2 VLAN to system without defining how to deal with the IP packet whose destination
address is itself in the VLAN. If there is no VLAN interface, this kind of packets will be dropped.
Run the following command to define VLAN interface:

Command Purpose
Interface vlan number Configuring VLAN interface

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Interface Configuration

Chapter 3 Interface Configuration Example
3.1 Configuring Public Attribute of Interface
3.1.1 Example for Interface Description
The following example shows how to add a description for an interface.
interface vlan 1
ip address 192.168.1.23 255.255.255.0
3.1.2 Example of Interface Shutdown
The following example shows how to disable GigaEthernet interface 0/1.
interface GigaEthernet0/1
shutdown
The following example shows how to restart the interface.
interface GigaEthernet0/1
no shutdown

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