Cisco ME 3400 Command Reference Manual page 319

Chapter 2 Cisco ME 3400 Ethernet Access Switch Cisco IOS Commands
Some features are not supported only on all port types. Control protocols (CDP, STP, LLDP, and
EtherChannel LACP and PAgP) have different support on each port type:
•
•
•
For information about specific feature support, see the software configuration guide for this
release.When you change a port from one type to another, any features exclusive to a port type are
removed from the configuration to prevent conflicting configuration options on a specific interface.
Every port on the switch can be a UNI or ENI, but when the switch is running the metro base or metro
access image, only four ports can be NNIs at the same time. If the switch is running the metro IP access
image, you can configure all ports as NNIs.
Entering the no port-type or default port-type interface configuration command returns the port to the
default state: UNI for Fast Ethernet ports and NNI for Gigabit Ethernet ports.
Traffic is not switched between UNIs or ENIs, and all traffic incoming on UNIs or ENIs must exit on
NNIs to prevent a user from gaining access to another user's private network. If it is appropriate for two
or more UNIs or ENIs to exchange traffic within the switch, you can assign the interface to a community
VLAN. A community VLAN can contain a maximum of eight UNIs or ENIs. We do not recommend
mixing UNIs and ENIs in the same community VLAN.
For more information about configuring VLANs, see the software configuration guide for this release.
Examples
This example shows how to change a port to an NNI.
Switch# configure terminal
Enter configuration commands, one per line.
Switch(config)# interface fastethernet0/1
Switch(config-if)# no shutdown
Switch(config-if)# port-type nni
5d20h: %SYS-5-CONFIG_I: Configured from console by console
Switch(config-if)# end
Switch# copy running-config startup-config
This example shows how to change a port type to an ENI.
Switch# config terminal
Enter configuration commands, one per line.
Switch(config)# interface fastethernet0/1
Switch(config-if)# no shutdown
Switch(config-if)# port-type eni
Switch(config-if)# end
Related Commands Command
no
show interfaces
show port-type
OL-9640-07
On NNIs, these features are enabled by default.
On ENIs, these features are disabled by default, but you can enable them by using the command-line
interface.
On UNIs, these features are not supported.
Description
shutdown Enables an interface.
Displays the statistical information specific to all interfaces or to a specific
interface.
Displays the port type of an interface.
End with CNTL/Z.
End with CNTL/Z.
Cisco ME 3400 Ethernet Access Switch Command Reference
port-type
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