The Y.1731 frame transmission for a service attached to an iterator continues endlessly
unless intervened and stopped by an operator or until the iteration-count condition is
met. To stop the iterator from sending out any more proactive SLA measurement frames,
the operator must perform one of the following tasks:
•
Enable the deactivate sla-iterator-profile statement at the [edit protocols oam ethernet
connectivity-fault-management maintenance-domainmd-name maintenance association
ma-name mep mep-id remote-mep mep-id] hierarchy level. For more information, see
Verifying the Configuration of an Iterator Profile.
•
Provision a disable statement under the corresponding iterator profile at the [edit
protocols oam ethernet connectivity-fault-management performance-monitoring
sla-iterator-profiles profile-name] hierarchy level. For more information, see Configuring
an Iterator Profile.
Ethernet Delay Measurements and Loss Measurement by Proactive Mode
In two-way delay measurement, the delay measurement message (DMM) frame is
triggered through an iterator application. The DMM frame carries an iterator type, length,
and value (TLV) in addition to the fields described in standard frame format and the
server copies the iterator TLV from the DMM frame to the delay measurement reply
(DMR) frame.
In one-way delay variation computation using the two-way delay measurement method,
the delay variation computation is based on the timestamps that are present in the DMR
frame (and not the 1DM frame). Therefore, there is no need for client-side and server-side
clocks to be in sync. Assuming that the difference in their clocks remains constant, the
one-way delay variation results are expected to be fairly accurate. This method also
eliminates the need to send separate 1DM frames just for the one-way delay variation
measurement purpose.
In proactive mode for loss measurement, the router sends packets in standard format
along with loss measurement TLV and iterator TLV.
Related
Documentation
Configuring an Iterator Profile•
• Configuring a Remote MEP with an Iterator Profile
• Ethernet Frame Delay Measurements Overview
• Ethernet Frame Loss Measurement Overview on page 1121
• Verifying the Configuration of an Iterator Profile
• Managing Iterator Statistics
• On-Demand Mode for SLA Measurement on page 1125
• Ethernet Interfaces Feature Guide for Routing Devices
Copyright © 2017, Juniper Networks, Inc.1124
ACX Series Universal Access Router Configuration Guide
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