LAN Switching Configuration Guide, Cisco IOS Release 12.4T
Managed LAN Switch
Managed LAN Switch
Last Updated: December 8, 2011
The Managed LAN Switch feature enables the control of the four switch ports in Cisco 831, 836, and 837 routers. Each switch port is associated with a Fast Ethernet interface. The output of the show controllers fastEthernet commanddisplays the status of the selected switch port.
The Managed LAN Switch feature allows you to set and display the following parameters for each of the switch ports:
It also allows you to display the link state of a switch port--that is, whether a device is connected to that port or not.
Finding Feature Information
Your software release may not support all the features documented in this module. For the latest feature information and caveats, see the release notes for your platform and software release. To find information about the features documented in this module, and to see a list of the releases in which each feature is supported, see the Feature Information Table at the end of this document.
Use Cisco Feature Navigator to find information about platform support and Cisco software image support. To access Cisco Feature Navigator, go to www.cisco.com/go/cfn. An account on Cisco.com is not required.
Information About Managed LAN Switch
A LAN is a high-speed, fault-tolerant data network that supplies connectivity to a group of computers, printers, and other devices that are in close proximity to each other, as in an office building, a school or a home. LANs offer computer users many advantages, including shared access to devices and applications, file exchange between connected users, and communication between users via electronic mail and other applications.
For more information about LAN switching, see the "LAN Switching" module of the Internetworking Technology Handbook .
How to Enable Managed LAN Switch
Enabling Managed LAN Switch
2. configure terminal
3. interface type number
4. duplex auto
5. speed auto
Verifying the Managed LAN Switch Configuration
2. show controllers fastethernet number
Configuration Examples for Managed LAN Switch
Enabling the Managed LAN Switch Example
The following example shows the Managed LAN Switch configured with duplex set to auto and full, with speed set to auto and 100:
configure terminal Enter configuration commands, one per line. End with CNTL/Z. interface fastethernet1 no ip address duplex auto speed auto ! interface fastethernet2 no ip address duplex full <---------------- duplex setting of port 2 speed 100 <----------------- speed setting of port 2 ! interface fastethernet3 no ip address shutdown <-------------- shutting down port 3 duplex auto speed auto ! interface fastethernet4 no ip address duplex auto speed auto !
Verifying the Managed LAN Switch Configuration Example
To verify the Managed LAN Switch configuration, enter the show controllers fastethernet <1-4> command in privileged EXEC mode. The following sample output shows the status of switch port 1.
Router# show controllers fastethernet1 ! Interface FastEthernet1 MARVELL 88E6052 Link is DOWN Port is undergoing Negotiation or Link down Speed :Not set, Duplex :Not set ! Switch PHY Registers: ~~~~~~~~~~~~~~~~~~~~~ 00 : 3100 01 : 7849 02 : 0141 03 : 0C1F 04 : 01E1 05 : 0000 06 : 0004 07 : 2001 08 : 0000 16 : 0130 17 : 0002 18 : 0000 19 : 0040 20 : 0000 21 : 0000 ! Switch Port Registers: ~~~~~~~~~~~~~~~~~~~~~~ Port Status Register  : 0800 Switch Identifier Register  : 0520 Port Control Register  : 007F Rx Counter Register  : 000A Tx Counter Register  : 0008 !
Feature Information for Managed LAN Switch
The following table provides release information about the feature or features described in this module. This table lists only the software release that introduced support for a given feature in a given software release train. Unless noted otherwise, subsequent releases of that software release train also support that feature.
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Any Internet Protocol (IP) addresses and phone numbers used in this document are not intended to be actual addresses and phone numbers. Any examples, command display output, network topology diagrams, and other figures included in the document are shown for illustrative purposes only. Any use of actual IP addresses or phone numbers in illustrative content is unintentional and coincidental.
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