Configuring The Port Type - Cisco ME 3400 Software Configuration Manual

Configuring Ethernet Interfaces
Table 9-2 Default Ethernet Configuration for UNIs and ENIs (continued)
Feature
IEEE 802.3x flow control
EtherChannel
Port blocking (unknown multicast and
unknown unicast traffic)
Broadcast, multicast, and unicast storm
control
Port security
Auto-MDIX

Configuring the Port Type

By default, all the 10/100 ports on the Cisco ME switch are configured as UNIs, and the SFP module
ports are configured as NNIs. You can also configure the port type as ENI. An ENI has the same
characteristics as a UNI, but it can be configured to support CDP, STP, LLDP, and Etherchannel LACP
and PAgP.
You use the port-type interface configuration command to change the port types. If the switch is running
the metro base or metro access image, only four ports on the switch can be configured as NNIs at one
time.If the switch is running the metro IP access image, there is no limit to the number of NNIs that can
be configured on the switch. All ports on the switch can be configured as UNIs or ENIs.
When a port is changed from an NNI to a UNI or ENI, it inherits the configuration of the assigned
VLAN, either in isolated or community mode. For more information about configuring UNI-ENI
isolated and UNI-ENI community VLANs, see
When you change a port from NNI to UNI or ENI or the reverse, any features exclusive to the port type
revert to the default configuration. For Layer 2 protocols, such as STP, CDP, and LLDP, the default for
UNIs and ENIs is disabled (although they can be enabled on ENIs) and the default for NNIs is enabled.
By default, the switch sends keepalive messages on UNI s and ENIs and does not send keepalive
Note
messages on NNIs. Changing the port type from UNI or ENI to NNI or from NNI to UNI or ENI has no
effect on the keepalive status. You can change the keepalive state from the default setting by entering the
[no] keepalive interface configuration command. If you enter the keepalive command with no
arguments, keepalive packets are sent with the default time interval (10 seconds) and number of retries
(5). Entering the no keepalive command disables keepalive packets on the interface.
Beginning in privileged EXEC mode, follow these steps to configure the port type on an interface:
Command
Step 1
configure terminal
Step 2 interface interface-id
Cisco ME 3400 Ethernet Access Switch Software Configuration Guide
9-14
Default Setting
Flow control is set to receive: off. It is always off for sent packets.
Disabled on all Ethernet ports. See
and Link-State Tracking."
Disabled (not blocked) (only Layer 2 interfaces). See the
Blocking" section on page
Disabled. See the "Default Storm Control Configuration" section on
page 22-3.
Disabled (only Layer 2 interfaces). See the
Configuration" section on page
Enabled.
Chapter 11, "Configuring VLANs."
Purpose
Enter global configuration mode
Specify the interface to configure, and enter interface configuration
mode.
Chapter 9
Chapter 34, "Configuring EtherChannels
22-7.
"Default Port Security
22-11.
Configuring Interfaces
"Configuring Port
OL-9639-07