Cisco Catalyst 4500 Series Configuration Guide

31-2
Software Configuration Guide—Release IOS XE 3.3.0SG and IOS 15.1(1)SG
OL-25340-01
Chapter 31 Configuring Unidirectional Ethernet
Configuring Unidirectional Ethernet
Configuring Unidirectional Ethernet
Note You must configure Unidirectional Ethernet on the non-blocking Gigabit Ethernet Port, which
automatically disables UDLD on the port.
To enable Unidirectional Ethernet, perform this task:
This example shows how to set Gigabit Ethernet interface 1/1 to unidirectionally send traffic:
Switch# configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
Switch(config)# interface gigabitethernet 1/1
Switch(config-if)# unidirectional send-only
Switch(config-if)# end
Warning!
Enable l2 port unidirectional mode will automatically disable port udld.
You must manually ensure that the unidirectional link does not create
a spanning tree loop in the network.
Enable l3 port unidirectional mode will automatically disable ip routing
on the port. You must manually configure static ip route and arp entry
in order to route ip traffic.
This example shows how to set Gigabit Ethernet interface 1/1 to receive traffic unidirectionally:
Switch# configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
Switch(config)# interface gigabitethernet 1/1
Switch(config-if)# unidirectional receive-only
Switch(config-if)# end
Warning!
Enable l2 port unidirectional mode will automatically disable port udld.
You must manually ensure that the unidirectional link does not create
a spanning tree loop in the network.
Enable l3 port unidirectional mode will automatically disable ip routing
on the port. You must manually configure static ip route and arp entry
in order to route ip traffic.
Command Purpose
Step 1
Switch(config)# interface {vlan vlan_ID |
{fastethernet | gigabitethernet |
tengigabitethernet} slot/interface
| Port-channel
number}
Selects the interface to configure.
Step 2
Switch(config-if)# [no] unidirectional {send-only
| receive-only}
Enables Unidirectional Ethernet.
Use the no keyword to disable Unidirectional Ethernet.
Step 3
Switch(config-if)# end
Exits configuration mode.
Step 4
Switch# show interface {vlan vlan_ID |
{fastethernet | gigabitethernet |
tengigabitethernet} slot/interface}
unidirectional
Verifies the configuration.

Cisco Catalyst 4500 Series Specifications

General

Series	Catalyst 4500 Series
Category	Switch
Layer Support	Layer 2, Layer 3
Form Factor	Modular chassis
Stackable	No
Chassis Slots	3, 6, 7, 10
Power Supply Options	AC, DC
Redundancy	Power supply, Supervisor engine
Network Management	Cisco IOS Software CLI, SNMP, Cisco Prime Infrastructure
Features	Security, QoS
Port Density	Up to 384 ports per chassis
Security Features	802.1X, ACLs, DHCP Snooping, Dynamic ARP Inspection, IP Source Guard
Supervisor Engine	8-E