---
name: "dcb-maxrate"
section: "8"
platform: "linux"
package: "iproute2"
version: "7.3.0-1"
release: "Arch Linux 2026-11-01"
platforms: ["linux"]
url: "https://new.carta.tech/dcb-maxrate"
---

# dcb-maxrate(8)

show / manipulate port maxrate settings of the DCB (Data Center Bridging) subsystem

## NAME

dcb-maxrate - show / manipulate port maxrate settings of the DCB (Data Center Bridging) subsystem

## SYNOPSIS

**dcb** \[ *OPTIONS* \]  **maxrate** { *COMMAND* \| *help* }

**dcb maxrate show dev** DEV \[ **tc-maxrate** \]

**dcb maxrate set dev** DEV \[ **tc-maxrate** ***RATE-MAP*** \]

*RATE-MAP* := \[ *RATE-MAP* \] *RATE-MAPPING*

*RATE-MAPPING* := { *TC* \| ***all*** }***:**RATE*

*TC* := { ***0*** .. ***7*** }

*RATE* := { *INTEGER*\[***bit***\] \| *INTEGER**Kbit*** \|  *INTEGER**Mib*** \| *...* }

## DESCRIPTION

**dcb maxrate** is used to configure and inspect maximum rate at which traffic is allowed to egress from a given traffic class.

## PARAMETERS

The following describes only the write direction, i.e. as used with the **set** command. For the **show** command, the parameter name is to be used as a simple keyword without further arguments. This instructs the tool to show the value of a given parameter. When no parameters are given, the tool shows the complete maxrate configuration.

- **tc-maxrate *RATE-MAP***

  *RATE-MAP* uses the array parameter syntax, see [**dcb**(8)](/dcb/8.md) for details. Keys are TC indices, values are traffic rates in bits per second. The rates can use the notation documented in section PARAMETERS at [**tc**(8)](/tc/8.md). Note that under that notation, "bit" stands for bits per second whereas "b" stands for bytes per second. When showing, the command line option **-i** toggles between using decadic and ISO/IEC prefixes.

## EXAMPLE & USAGE

Set rates of all traffic classes to 25Gbps, except for TC 6, which will have the rate of 100Gbps:

\# dcb maxrate set dev eth0 tc-maxrate all:25Gbit 6:100Gbit

Show what was set:

\# dcb maxrate show dev eth0\
 tc-maxrate 0:25Gbit 1:25Gbit 2:25Gbit 3:25Gbit 4:25Gbit 5:25Gbit 6:100Gbit 7:25Gbit

## EXIT STATUS

Exit status is 0 if command was successful or a positive integer upon failure.

## SEE ALSO

[**dcb**(8)](/dcb/8.md)

## REPORTING BUGS

Report any bugs to the Network Developers mailing list **\<netdev@vger.kernel.org\>** where the development and maintenance is primarily done. You do not have to be subscribed to the list to send a message there.

## AUTHOR

Petr Machata \<me@pmachata.org\>