Junos® OS Ethernet Interfaces Configuration ... - Juniper Networks

ITU-T Y.1731 Frame Delay Measurement Feature
The IEEE 802.3-2005 standard for Ethernet Operations, Administration, and Maintenance
(OAM) defines a set of link fault management mechanisms to detect and report link
faults on a single point-to-point Ethernet LAN.
Junos OS supports key OAM standards that provide for automated end-to-end
management and monitoring of Ethernet service by service providers:
• IEEE Standard 802.1ag, also known as “Connectivity Fault Management (CFM).”
• ITU-T Recommendation Y.1731, which uses different terminology than IEEE 802.1ag and
defines Ethernet service OAM features for fault monitoring, diagnostics, and
performance monitoring.
These capabilities allow operators to offer binding service-level agreements (SLAs) and
generate new revenues from rate- and performance-guaranteed service packages that
are tailored to the specific needs of their customers.
Ethernet CFM
The IEEE 802.1ag standard for connectivity fault management (CFM) defines mechanisms
to provide for end-to-end Ethernet service assurance over any path, whether a single link
or multiple links spanning networks composed of multiple LANs.
For Ethernet interfaces on M320, MX Series, and T Series routers, Junos OS supports the
following key elements of the Ethernet CFM standard:
• Fault monitoring using the IEEE 802.1ag Ethernet OAM Continuity Check protocol
• Path discovery and fault verification using the IEEE 802.1ag Ethernet OAM Linktrace
protocol
Copyright © 2012, Juniper Networks, Inc.
• Fault isolation using the IEEE 802.1ag Ethernet OAM Loopback protocol
In a CFM environment, network entities such as network operators, service providers, and
customers may be part of different administrative domains. Each administrative domain
is mapped into one maintenance domain. Maintenance domains are configured with
different level values to keep them separate. Each domain provides enough information
for the entities to perform their own management and end-to-end monitoring, and still
avoid security breaches.
Figure 25 on page 240 shows the relationships among the customer, provider, and operator
Ethernet bridges, maintenance domains, maintenance association end points (MEPs),
and maintenance intermediate points (MIPs).
Chapter 14: Configuring ITU-T Y.1731 Ethernet Service OAM
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