Guidelines For Configuring Eth-Slm - Juniper ACX1000 Configuration Manual

ACX Series Universal Access Router Configuration Guide

Guidelines for Configuring ETH-SLM

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Troubleshooting Failures with ETH-SLM
Ethernet Interfaces Feature Guide for Routing Devices
Keep the following points in mind when you configure the ETH-SLM functionality:
The monitoring application for Ethernet OAM is initiated in the master Routing Engine.
When a stateful switchover process occurs, the monitoring application is disabled. For
on-demand ETH-SLM, graceful Routing Engine switchover (GRES) support is not
applicable. For proactive ETH-SLM, the service-level agreement (SLA) iterators are
restored during a stateful switchover process. If the adjacencies do not time out, the
ETH-SLM statistics are preserved and proactive ETH-SLM supports GRES.
ETH-SLM is initiated only when the MEP session is up. Unified in-service software
upgrade (ISSU) support for ETH-SLM depends on the unified ISSU support for CFM.
For CFM, unified ISSU is supported using the loss threshold TLV to avoid CFM
connectivity loss during the upgrade. The receiving or the destination MEP increases
the threshold time during the termination of sessions. If you start a unified ISSU
operation when on-demand ETH-SLM is in progress, the SLM request and reply
messages are lost at the local Packet Forwarding Engine.
When an on-demand ETH-SLM is requested, if the local source MEP undergoes a
unified ISSU, a message is displayed stating that the MEP is undergoing a unified ISSU.
If the remote MEP is undergoing a unified ISSU (detected through the loss threshold
TLV), a message is displayed stating that the remote MEP is undergoing a unified ISSU.
Also, if it is not possible to identify whether unified ISSU is in progress on a remote MEP,
the SLM packets are lost at the system where unified ISSU is in progress and the loss
calculation results do not provide a valid cause for the loss. Unified ISSU is not
supported for both on-demand and proactive ETH-SLM.
The maximum number of SLA iterator profiles that can be configured in the system is
255.
ETH-SLM is not supported for virtual private LAN service (VPLS) (point-to-multipoint
measurements are not supported). The ETH-SLM frames are not generated with
multicast class 1 destination address. Similarly, ETH-SLM does not respond to ETH-SLM
requests with multicast DA. ETH-SLM for VPLS for point-to-point Ethernet connection
is supported using directed unicast destination MAC addresses, although
point-to-multipoint topologies are not supported.
A unicast destination address may be used in provisioned environments for
point-to-point connections. However, it requires that the unicast destination address
of the downstream MEP must have been configured on the MEP transmitting an alarm
indication signal (AIS).
ETH-SLM is not supported on downstream MEPs on label-switched interfaces (LSIs).
ETH-SLM is supported on aggregated Ethernet (ae) interfaces
The number of ETH-SLM sessions for proactive ETH-SLM that can be supported is
limited to the total number of iterators that can be supported in the system. This
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