Delay Buffer Size

You can configure the delay buffer size to control congestion at the output stage. A delay buffer provides packet buffer space to absorb burst traffic up to a specified duration of delay. When the buffer is full, all packets are dropped.

The system calculates the buffer size for a queue based on the buffer allocation method you specify for it in the scheduler. See Delay Buffer Size Allocation Methods for different buffer allocation methods and Specifying Delay Buffer Sizes for Queues for buffer size calculations.

By default, all J-series Services Router interfaces other than channelized T1/E1 interfaces support a delay buffer time of 100,000 microseconds. On channelized T1/E1 interfaces, the default delay buffer time is 500,000 microseconds for clear-channel interfaces, and 1,200,000 microseconds for NxDS0 interfaces.

On J-series Services Routers, you can configure larger delay buffers on channelized T1/E1 interfaces. Larger delay buffers help these slower interfaces to avoid congestion and packet dropping when they receive large bursts of traffic. For more information, see Configuring Large Delay Buffers with a Configuration Editor.

Copyright © 2009, Juniper Networks, Inc. All rights reserved. Trademark Notice.