Cisco Catalyst 4500 Series Software Configuration Manual page 926

Configuring Unidirectional Ethernet
To enable Unidirectional Ethernet, perform this task:
Command
Step 1
Switch(config)# interface {vlan vlan_ID |
{fastethernet | gigabitethernet |
tengigabitethernet} slot/interface
number}
Step 2
Switch(config-if)# [no] unidirectional {send-only
| receive-only}
Step 3
Switch(config-if)# end
Step 4
Switch# show interface {vlan vlan_ID |
{fastethernet | gigabitethernet |
tengigabitethernet} slot/interface}
unidirectional
This example shows how to set Gigabit Ethernet interface 1/1 to unidirectionally send traffic:
Switch# configure terminal
Enter configuration commands, one per line.
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.
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.
This example shows how to verify the configuration:
Switch> show interface gigabitethernet 1/1 unidirectional
show interface gigabitethernet 1/1 unidirectional
Unidirectional configuration mode: send only
CDP neighbor unidirectional configuration mode: receive only
Catalyst 4500 Series Switch, Cisco IOS Software Configuration Guide - Cisco IOS XE 3.9.xE and IOS 15.2(5)Ex
34-2
Purpose
Selects the interface to configure.
|
Port-channel
Enables Unidirectional Ethernet.
Use the no keyword to disable Unidirectional Ethernet.
Exits configuration mode.
Verifies the configuration.
End with CNTL/Z.
End with CNTL/Z.
Chapter 34 Configuring Unidirectional Ethernet