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Hierarchy Level


Dedicated buffer profile configuration.

By default, the operating system calculates port level dedicated buffers internally. Therefore, even ports that are down or unused also get an equal amount of dedicated buffer space that is then unavailable to any traffic burst. dedicated-buffer-profile provides the ability to increase or decrease the default dedicated buffer at a physical interface level.

Once you define a dedicated-buffer-profile, you can attach it directly to a physical interface. For example:

Remaining dedicated buffers that you do not allocate to any ports by a dedicated-buffer-profile are equally shared among ports (based on speed) that don't have a dedicated-buffer-profile assigned to them.


You cannot assign a dedicated-buffer-profile to aggregated Ethernet (ae-) interfaces. You can only assign a dedicated-buffer-profile to a physical interface.


If the buffer-size of all dedicated buffer profiles combined exceeds the total available dedicated buffer pool, the system logs a syslog error and does not implement the new configuration even though the commit succeeds.



Name the buffer profile. You apply a dedicated buffer profile to a physical interface by this name.

egress buffer-size cells

Set the egress dedicated buffer size for a port as a number of cells or none for no dedicated buffer.

Range: 20-100,000 (Each cell is 254 bytes.)

ingress buffer-size cells

Set the ingress dedicated buffer size for a port as a number of cells or none for no dedicated buffer.

Range: 20-50,000 (Each cell is 254 bytes.)

Required Privilege Level

interface—To view this statement in the configuration.

interface-control—To add this statement to the configuration.

Release Information

Statement introduced in Junos OS Evolved Release 23.2R1.