Broadcom NetXtreme II goes offline with error MDC/MDIO access timeout

Solution Verified - Updated -

Issue

  • Broadcom NetXtreme II NIC goes offline with error MDC/MDIO access timeout
  • System is unresponsive to network traffic, and the following error message is logged:
kernel: bnx2x 0000:02:00.0: eth0: MDC/MDIO access timeout
  • This message may appear many times in /var/log/messages:
$ grep "MDC/MDIO access timeout" /var/log/messages |wc -l
125904

Environment

  • Red Hat Enterprise Linux 6.4 or earlier
  • Broadcom Corporation NetXtreme II 10-Gigabit network interface using bnx2x driver

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