Cisco ASR 9000 Series System Configuration Guide

CFM Performance Monitoring
The Connectivity Fault Management (CFM) feature is supported on the nV Satellite system. To use this feature
the Maintenance End Points (MEPs) must be configured on the satellite access ports so that they belong to
the CFM service over which performance monitoring is being implemented. In an nV Satellite system, the
MEPs that are set on the satellite access ports are configured on the ASR9k host. For additional details on
CFM configuration, refer to the topic "Ethernet CFM" in the Cisco ASR 9000 Series Aggregation Services
Router Interface and Hardware Component Configuration Guide
CFM Performance Monitoring (PM) applies time-stamps or sequence numbers on CFM PM frames (PDUs),
at the two MEPs (controller and responder) between which performance is being measured. The controller
MEP initiates the PM process by sending frames to the responder. The responder MEP processes the frames
and sends them back to the controller, for the latter to evaluate the frames and calculate the PM result.
Prior to Cisco IOS XR Release 5.3.1, MEPs configured on Satellite Access ports processed (time-stamped)
performance monitoring frames at the host. To ensure accuracy in performance monitoring, the frames are
now processed on the satellite instead of the ASR9K host.
The features supported in Release 5.3.1 are:
•
Up MEPs process (timestamp) only those CFM PM frames on the satellite that meet the criteria (see
processing locations table), and the remaining CFM PM frames are processed on the ASR9K host.
Down MEPs process all CFM PM frames on the ASR9K host.
•
Only the responder functionality for two-way delay measurement is available on the satellite. The
controller functionality is managed by the ASR9K host. Also, the two CFM processes, the Loopback
process and the Synthetic Loss Measurement process are managed by the ASR9K host.
From Release 5.3.1 onwards, if the satellite supports it, the processing of relevant frames on the satellite
happens by default. To turn off the satellite processing functionality, use the nv satellite sla processing
disable command in the ethernet cfm configuration mode. If the frames are not processed on the satellite,
they are processed on the ASR9K host by default.
Note
nV Satellite CFM Performance Monitoring Processing Locations
This table lists various parameters and functionalities, and the corresponding locations where the CFM PM
frames are processed. The location can either be the satellite or the ASR9K host.
ASR9000vASR901Parameter
SatelliteSatelliteUp MEP responder
HostHostDown MEP responder
SatelliteSatelliteDelay Measurement (v0)
Satellite
Frames are not processed
Delay Measurement (v1)
HostHostBundle ICLs in Hub & Spoke
topologies
Cisco ASR 9000 Series Aggregation Services Router nV System Configuration Guide, Release 5.3.x
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Configuring the Satellite Network Virtualization (nV) System
CFM Performance Monitoring

Cisco ASR 9000 Series Specifications

General

Brand	Cisco
Model	ASR 9000 Series
Category	Network Router
Language	English