Configuring 802.3Ah Oam Link-Fault Management - Juniper JUNOSE SOFTWARE 11.2.X - LINK LAYER CONFIGURATION GUIDE 7-7-2010 Configuration Manual

JunosE 11.2.x Link Layer Configuration Guide
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Configuring 802.3ah OAM Link-Fault Management

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the OAM entities to send Link Fault Information OAM PDUs to the peer whenever a
receive path failure is detected. In addition, an active mode OAM entity can retrieve
and respond to the performance variables that it receives from its peer entity. However,
the local OAM entity does not send a list of such performance variables that it can
process from the peer.
OAM Feature Overview on page 230
Interrelationship of OAM Link-Fault Management with Ethernet Subsystems on page 236
Configuring 802.3ah OAM Link-Fault Management on page 238
Ethernet OAM link-fault management can be used for physical link-level fault detection
and management. It uses a new, optional sublayer in the data link layer of the OSI model.
Ethernet OAM can be implemented on any full-duplex point-to-point or emulated
point-to-point Ethernet link. A system-wide implementation is not required; OAM can
be deployed on particular interfaces of a router. Transmitted Ethernet OAM messages
or OAM PDUs are of standard length, untagged Ethernet frames within the normal frame
length limits in the range 64–1518 bytes.
To configure OAM link-fault management on an Ethernet interface:
Specify a Fast Ethernet, Gigabit Ethernet, or 10-Gigabit Ethernet interface, and enable
1.
IEEE 802.3ah OAM support on the interface. When the IEEE 802.3ah OAM protocol
is enabled on a physical interface, the discovery process is automatically triggered.
The default discovery mode of a local interface is active.
host1(config)#interface GigabitEthernet 6/0
host1(config-if)#ethernet oam lfm
NOTE: You must enable the OAM link-fault management feature to be able to configure
parameters that govern the link monitoring and management process.
All of the following steps are optional. You can choose which of the OAM configurations
you want to set up on the interface to enable link-fault administration. If you enable
OAM support on the interface without specifying any of the other parameters, such as
discovery mode and threshold settings, default values are assumed for those attributes.
Specify whether the interface or the peer initiates the discovery process by configuring
2.
the link discovery mode to active or passive.
host1(config-if)#ethernet oam lfm mode active
In this case, the discovery mode of the interface is set as active. In active mode, the
interface discovers and monitors the peer on the link if the peer also supports IEEE
802.3ah OAM functionality. An OAM entity in active mode initiates the discovery
process by sending an Information OAM PDU to the multicast address of the slow
protocol (0180.c200.0002) at a configured rate. In a carrier environment, the
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