Example: Configure Ethernet OAM Link Fault Management
Junos OS allows the Ethernet interfaces on these switches to support the IEEE 802.3ah standard for the Operation, Administration, and Maintenance (OAM) of Ethernet in access networks. The standard defines OAM link fault management (LFM). You can configure IEEE 802.3ah OAM LFM on point-to-point Ethernet links that are connected either directly or through Ethernet repeaters.
This example describes how to enable and configure OAM LFM on a Gigabit Ethernet interface:
Requirements
This example uses the following hardware and software components:
Junos OS Release 9.4 or later for EX Series switches
Two EX3200 or EX4200 switches connected directly
Overview and Topology
Junos OS switches allows the Ethernet interfaces on these switches to support the IEEE 802.3ah standard for the Operation, Administration, and Maintenance (OAM) of Ethernet in access networks. The standard defines OAM link fault management (LFM). You can configure IEEE 802.3ah OAM LFM on point-to-point Ethernet links that are connected either directly or through Ethernet repeaters.
Topology
This example uses two EX4200 switches connected directly. Before you begin configuring Ethernet OAM LFM on two switches, connect the two switches directly through a trunk interface.
Configuring Ethernet OAM Link Fault Management on Switch 1
CLI Quick Configuration
To quickly configure Ethernet OAM LFM, copy the following commands and paste them into the switch terminal window:
[edit protocols oam ethernet link-fault-management]
set interface ge-0/0/0
set interface ge-0/0/0 link-discovery active
set interface ge-0/0/0 pdu-interval 800
set interface ge-0/0/0 remote-loopback Procedure
Step-by-Step Procedure
To configure Ethernet OAM LFM on switch 1:
Enable IEEE 802.3ah OAM support on an interface:
[edit protocols oam ethernet link-fault-management] user@switch1# set interface ge-0/0/0
Specify that the interface initiates the discovery process by configuring the link discovery mode to
active:[edit protocols oam ethernet link-fault-management] user@switch1# set interface ge-0/0/0 link-discovery active
Set the periodic OAM PDU-sending interval (in milliseconds) to 800 on switch 1:
[edit protocols oam ethernet link-fault-management] user@switch1# set interface pdu-interval 800
Set a remote interface into loopback mode so that all frames except OAM PDUs are looped back without any changes made to the frames. Ensure that the remote DTE supports remote loopback mode. To set the remote DTE in loopback mode
[edit protocols oam ethernet link-fault-management] user@switch1# set interface ge-0/0/0.0 remote-loopback
Results
Check the results of the configuration:
[edit] user@switch1# show
protocols {
oam {
ethernet {
link-fault-management {
interface ge-0/0/0 {
pdu-interval 800;
link-discovery active;
remote-loopback;
}
}
}
}
Configuring Ethernet OAM Link Fault Management on Switch 2
CLI Quick Configuration
To quickly configure Ethernet OAM LFM on switch 2, copy the following commands and paste them into the switch terminal window:
[edit protocols oam ethernet link-fault-management ]
set interface ge-0/0/1
set interface ge-0/0/1 negotiation-options allow-remote-loopback
Procedure
Step-by-Step Procedure
To configure Ethernet OAM LFM on switch 2:
Enable OAM on the peer interface on switch 2:
[edit protocols oam ethernet link-fault-management] user@switch2# set interface ge-0/0/1
Enable remote loopback support for the local interface:
[edit protocols oam ethernet link-fault-management] user@switch2# set interface ge-0/0/1 negotiation-options allow-remote-loopback
Results
Check the results of the configuration:
[edit]
user@switch2# show
protocols {
oam {
ethernet {
link-fault-management {
interface ge-0/0/1 {
negotiation-options {
allow-remote-loopback;
}
}
}
}
}
Verification
Verifying That OAM LFM Has Been Configured Properly
Purpose
Verify that OAM LFM has been configured properly.
Action
Use the show oam ethernet link-fault-management command:
user@switch1#
Sample Output
command-name
Interface: ge-0/0/0.0 Status: Running, Discovery state: Send Any Peer address: 00:19:e2:50:3b:e1 Flags:Remote-Stable Remote-State-Valid Local-Stable 0x50 Remote entity information: Remote MUX action: forwarding, Remote parser action: forwarding Discovery mode: active, Unidirectional mode: unsupported Remote loopback mode: supported, Link events: supported Variable requests: unsupported
Meaning
When the output displays the MAC address and the discover
state is Send Any, it means that OAM LFM has been configured
properly.