Configuring Ethernet Management Ports

Configuring Ethernet Management Ports
Configuring Ethernet Management Ports
• Finding Feature Information, page 1
• Prerequisites for Ethernet Management Ports, page 1
• Information about the Ethernet Management Port, page 1
• How to Configure the Ethernet Management Port, page 4
• TFTP and the Ethernet Management Port, page 5
• Additional References, page 6
Finding Feature Information
Your software release may not support all the features documented in this module. For the latest caveats and
feature information, see Bug Search Tool and 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 module.
Use Cisco Feature Navigator to find information about platform support and Cisco software image support.
To access Cisco Feature Navigator, go to http://www.cisco.com/go/cfn. An account on Cisco.com is not
required.
Prerequisites for Ethernet Management Ports
When connecting a PC to the Ethernet management port, you must first assign an IP address.
Information about the Ethernet Management Port
The Ethernet management port, also referred to as the Fa0 or fastethernet0 port, is a Layer 3 host port to
which you can connect a PC. You can use the Ethernet management port instead of the switch console port
for network management. When managing a switch stack, connect the PC to the Ethernet management port
on a stack member.
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Configuring Ethernet Management Ports
Ethernet Management Port Direct Connection to a Switch
Related Topics
Disabling and Enabling the Ethernet Management Port, on page 4
TFTP and the Ethernet Management Port, on page 5
Ethernet Management Port Direct Connection to a Switch
This figure displays how to connect the Ethernet management port to the PC for a switch or a standalone
switch.
Figure 1: Connecting a Switch to a PC
Ethernet Management Port Connection to Stack Switches using a Hub
In a stack with only stack switches, all the Ethernet management ports on the stack members are connected
to a hub to which the PC is connected. The active link is from the Ethernet management port on the active
switchstack masterthrough the hub, to the PC. If the activeswitch fails and a new active switch is elected, the
active link is now from the Ethernet management port on the new active switch to the PC.
In a mixed stack, the stack members are connected to the PC through the Ethernet management ports. The
active link is from the active switch to the PC. If the active switch fails and the elected active switch is not
switch 2, the active link can be from a stack member to the PC.
This figure displays how a PC uses a hub to connect to a switch stack.
Figure 2: Connecting a Switch Stack to a PC
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Configuring Ethernet Management Ports
Ethernet Management Port and Routing
Ethernet Management Port and Routing
By default, the Ethernet management port is enabled. The switch cannot route packets from the Ethernet
management port to a network port, and the reverse. Even though the Ethernet management port does not
support routing, you may need to enable routing protocols on the port.
Enable routing protocols on the Ethernet management port when the PC is multiple hops away from the switch
and the packets must pass through multiple Layer 3 devices to reach the PC.
Figure 3: Network Example with Routing Protocols Enabled
In the above figure , if the Ethernet management port and the network ports are associated with the same
routing process, the routes are propagated as follows:
• The routes from the Ethernet management port are propagated through the network ports to the network.
• The routes from the network ports are propagated through the Ethernet management port to the network.
Because routing is not supported between the Ethernet management port and the network ports, traffic between
these ports cannot be sent or received. If this happens, data packet loops occur between the ports, which disrupt
the switch and network operation. To prevent the loops, configure route filters to avoid routes between the
Ethernet management port and the network ports.
Supported Features on the Ethernet Management Port
The Ethernet management port supports these features:
• Express Setup (only in switch stacks)
• Network Assistant
• Telnet with passwords
• TFTP
• Secure Shell (SSH)
• DHCP-based autoconfiguration
• SMNP (only the ENTITY-MIB and the IF-MIB)
• IP ping
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Configuring Ethernet Management Ports
How to Configure the Ethernet Management Port
• Interface features
◦Speed—10 Mb/s, 100 Mb/s, and autonegotiation
◦Duplex mode—Full, half, and autonegotiation
◦Loopback detection
• Cisco Discovery Protocol (CDP)
• DHCP relay agent
• IPv4 access control lists (ACLs)
• Routing protocols
Caution
Before enabling a feature on the Ethernet management port, make sure that the feature is supported. If
you try to configure an unsupported feature on the Ethernet Management port, the feature might not work
properly, and the switch might fail.
Related Topics
Disabling and Enabling the Ethernet Management Port, on page 4
TFTP and the Ethernet Management Port, on page 5
How to Configure the Ethernet Management Port
Disabling and Enabling the Ethernet Management Port
SUMMARY STEPS
1. configure terminal
2. interface fastethernet0
3. shutdown
4. no shutdown
5. exit
6. show interfaces fastethernet0
DETAILED STEPS
Step 1
Command or Action
Purpose
configure terminal
Enters global configuration mode.
Example:
Switch# configure terminal
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Configuring Ethernet Management Ports
TFTP and the Ethernet Management Port
Step 2
Command or Action
Purpose
interface fastethernet0
Specifies the Ethernet management port in the CLI.
Example:
Switch(config)# interface fastethernet0
Step 3
Disables the Ethernet management port.
shutdown
Example:
Switch(config-if)# shutdown
Step 4
Enables the Ethernet management port.
no shutdown
Example:
Switch(config-if)# no shutdown
Step 5
Exits interface configuration mode.
exit
Example:
Switch(config-if)# exit
Step 6
show interfaces fastethernet0
Example:
Switch# show interfaces fastethernet0
Displays the link status.
To find out the link status to the PC, you can monitor the LED
for the Ethernet management port. The LED is green (on)
when the link is active, and the LED is off when the link is
down. The LED is amber when there is a POST failure.
What to Do Next
Related Topics
Information about the Ethernet Management Port, on page 1
Supported Features on the Ethernet Management Port, on page 3
TFTP and the Ethernet Management Port
Use TFTP to download or upload a configuration file to the boot loader.
This table describes the commands to use when downloading or uploading a configuration file to the boot
loader using TFTP.
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Configuring Ethernet Management Ports
Additional References
Table 1: Boot Loader Commands
Command
Description
arp [ ip_address ]
Displays the currently cached address resolution
protocol (ARP) table when this command is entered
without the ip_address parameter.
Enables ARP to associate a MAC address with the
specified IP address when this command is entered
with the ip_address parameter.
mgmt_clr
Clears the statistics for the Ethernet management port.
mgmt_init
Starts the Ethernet management port.
mgmt_show
Displays the statistics for the Ethernet management
port.
ping host_ip_address
Sends ICMP ECHO_REQUEST packets to the
specified network host.
boot tftp : /file-url .. .
Loads and boots an executable image from the TFTP
server and enters the command-line interface.
copy tftp: / source-file-url filesystem :/
destination-file-url
Copies a Cisco IOS image from the TFTP server to
the specified location.
Related Topics
Information about the Ethernet Management Port, on page 1
Supported Features on the Ethernet Management Port, on page 3
Additional References
Related Documents
Related Topic
Document Title
Bootloader configuration
Catalyst 3750-X and 3560-X Switches System
Management Configuration Guide
Bootloader commands
Catalyst 3750-X and 3560-X Switches System
Management Command Reference Guide
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Configuring Ethernet Management Ports
Additional References
Error Message Decoder
Description
Link
To help you research and resolve system error
messages in this release, use the Error Message
Decoder tool.
https://www.cisco.com/cgi-bin/Support/Errordecoder/
index.cgi
MIBs
MIB
MIBs Link
All supported MIBs for this release.
To locate and download MIBs for selected platforms,
Cisco IOS releases, and feature sets, use Cisco MIB
Locator found at the following URL:
http://www.cisco.com/go/mibs
Technical Assistance
Description
Link
The Cisco Support website provides extensive online http://www.cisco.com/support
resources, including documentation and tools for
troubleshooting and resolving technical issues with
Cisco products and technologies.
To receive security and technical information about
your products, you can subscribe to various services,
such as the Product Alert Tool (accessed from Field
Notices), the Cisco Technical Services Newsletter,
and Really Simple Syndication (RSS) Feeds.
Access to most tools on the Cisco Support website
requires a Cisco.com user ID and password.
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Configuring Ethernet Management Ports
Additional References
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