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Configuring Distributed Periodic Packet Management

 

Periodic packet management (PPM) is responsible for processing a variety of time-sensitive periodic tasks so that other processes can more optimally direct their resources.

The responsibility for PPM processing on the switch is distributed between the Routing Engine and the access interfaces for all protocols that use PPM by default. This distributed model provides a faster response time for protocols that use PPM than the response time provided by the nondistributed model.

If distributed PPM is disabled, the PPM process runs on the Routing Engine only.

You can disable distributed PPM for all protocols that use PPM. You can also disable distributed PPM for Link Aggregation Control Protocol (LACP) packets only.

Best Practice

We generally recommend that you disable distributed PPM only if Juniper Networks Customer Service advises you to do so. You should disable distributed PPM only if you have a compelling reason to disable it.

This topic describes:

Disabling or Enabling Distributed Periodic Packet Management Globally

Distributed PPM is enabled by default. Disable distributed PPM if you need to move all PPM processing to the Routing Engine. Enable distributed PPM if it was previously disabled and you need to run distributed PPM.

To disable distributed PPM:

[edit routing-options]

user@switch# set ppm no-delegate-processing

To enable distributed PPM if it was previously disabled:

[edit routing-options]

user@switch# delete ppm no-delegate-processing

Disabling or Enabling Distributed Periodic Packet Management for LACP Packets

Distributed PPM is enabled by default. Disable distributed PPM for only LACP packets if you need to move all PPM processing for LACP packets to the Routing Engine.

To disable distributed PPM for LACP packets:

[edit protocols]

user@switch# set lacp ppm centralized

To enable distributed PPM for LACP packets if it was previously disabled:

[edit protocols]

user@switch# delete lacp ppm centralized