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
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Prerequisites for Ethernet Management Ports
When connecting a PC to the Ethernet management port, you must first assign an IP address.
the Ethernet Management Port
The Ethernet management port,
also referred to as the
GigabitEthernet0/0 port, is a VRF (VPN routing/forwarding)
interface to which you can connect a PC. You can use the Ethernet management
port instead of the
console port for network management. When managing a
stack, connect the PC to the Ethernet management port on a stack member.
Port Direct Connection to a
Figure 1. Connecting a
Switch to a PC. This figure
displays how to connect the Ethernet management port to the PC for a
or a standalone
Port Connection to Stack
using a Hub
In a stack with only
devices, 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 switchthrough the hub, to the PC. If the
activedevice fails and a new active
device is elected, the active link is now
from the Ethernet management port on the new active
device to the PC.
Figure 2. Connecting a
Device Stack to a PC. This figure
displays how a PC uses a hub to connect to a
Port and Routing
By default, the
Ethernet management port is enabled. The
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.
Figure 3. Network Example
with Routing Protocols Enabled. Enable routing
protocols on the Ethernet management port when the PC is multiple hops away
and the packets must pass through multiple Layer 3 devices to reach the PC.
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
The routes from
the network ports are propagated through the Ethernet management port to the
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
and network operation. To prevent the loops, configure route filters to avoid
routes between the Ethernet management port and the network ports.
on the Ethernet Management Port
management port supports these features:
Express Setup (only in switch stacks)
Secure Shell (SSH)
SMNP (only the
ENTITY-MIB and the IF-MIB)
mode—Full, half, and autonegotiation
control lists (ACLs)
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
How to Configure the Ethernet Management Port
Enabling the Ethernet Management Port
Command or Action
Device# configure terminal
Device(config)# interface gigabitethernet0/0
Ethernet management port in the CLI.
Ethernet management port.
Device(config-if)# no shutdown
Ethernet management port.
Device# show interfaces gigabitethernet0/0
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
Proceed to manage or configure your switch using the Ethernet
management port. Refer to the
Network Management Configuration Guide (Catalyst 3850 Switches).
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