Specifications

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Cisco ME 2400 Ethernet Access Switch Command Reference
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Chapter 2 Cisco ME 2400 Ethernet Access Switch Cisco IOS Commands
port-type
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:
• 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.
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 only four ports can be NNIs at the same time. When
you use the no port-type command on any interface, whether it is currently a UNI, ENI, or NNI, the
interface defaults to UNI.
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. End with CNTL/Z.
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. End with CNTL/Z.
Switch(config)# interface fastethernet0/1
Switch(config-if)# no shutdown
Switch(config-if)# port-type eni
Switch(config-if)# end
Related Commands Command Description
no shutdown Enables an interface.
show interfaces Displays the statistical information specific to all interfaces or to a specific
interface.
show port-type Displays the port type of an interface.