Bonding slaves show link speed as 100Mbps for gigabit slave interfaces in /proc/net/bonding

Solution Verified - Updated -

Issue

  • The slave interfaces shows the link speed as 100Mbps but running ethtool command on individual interfaces shows it as 1000Mbps.

  • When bringing up a bonded interface, a message is logged like:

Warning: failed to get speed and duplex from eth*, assumed to be 100Mb/sec and Full.

Environment

  • Red Hat Enterprise Linux 5 Update 6
  • Network bonding
  • Network interface faster than 100Mbps

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