dcb-maxrate - Linux


dcb-maxrate modifies the Data Center Bridging (DCB) maximum transmit data rate for a data interface. DCB is a set of IEEE standards designed to enhance the quality and efficiency of network transmissions in data center environments.


dcb-maxrate [--help] [-q] [--quiet] [-v] [--version]
           [--maxrate RATE] <IFACE>


  • –maxrate RATE: Set the maximum transmit rate in Mbit/s, V/G/P bit/s, or percent.
  • -q, –quiet: Suppress normal output; if this is the only argument, then the current setting is displayed.
  • -v, –version: Print the program’s version number.
  • –help: Display help and exit.


Display current maxrate:

$ dcb-maxrate -q eth0

Set maxrate to 5 Gbit/s:

$ dcb-maxrate --maxrate 5G eth1

Disable maxrate:

$ dcb-maxrate --maxrate 0 eth2

Common Issues

  • Permission denied: Ensure you have sufficient privileges (e.g., root) to modify DCB settings.
  • DCB not supported: Verify that your network interface supports and has DCB enabled.
  • Invalid rate value: Use valid units (Mbit/s, V/G/P bit/s, or percent) and ensure the value is within the interface’s capabilities.


Set maxrate with iproute2:

$ ip link set dev eth0 txqueuelen 1000 tc qdisc add dev eth0 root tbf rate 2Gbit burst 4096 limit 65535

Related Commands

  • ethtool – Configure Ethernet devices
  • ifconfig – Display or configure network interface parameters
  • tc – Traffic control utility