bonding reports unknown speed and duplex

Solution Unverified - Updated -


  • We are seeing via ip addr show and ethtool eth2 and ethtool eth3 no issues but when we run the command cat /proc/net/bonding/bond1 the status is reporting "unknown speed" and duplex for eth2 and eth3.
# ip addr show

2: eth2: <BROADCAST,MULTICAST,SLAVE,UP,LOWER_UP> master bond0 state UP
3: eth3: <BROADCAST,MULTICAST,SLAVE,UP,LOWER_UP> master bond0 state UP
# ethtool eth2
Settings for eth2:
        Speed: 1000Mb/s
        Duplex: Full
        Link detected: yes

# ethtool eth3
Settings for eth3:
        Speed: 1000Mb/s
        Duplex: Full
        Link detected: yes
# cat /proc/net/bonding/bond1
Ethernet Channel Bonding Driver: v3.7.1 (April 27, 2011)

Bonding Mode: fault-tolerance (active-backup)

Slave Interface: eth2
MII Status: up
Speed: Unknown
Duplex: Unknown

Slave Interface: eth3
Speed: Unknown
Duplex: Unknown


  • Red Hat Enterprise Linux 6.7 with kernel-2.6.32-573.26.1.el6
  • Red Hat Enterprise Linux 6.8 with kernel-2.6.32-642.13.1.el6
  • Bonding
  • Broadcom NetXtreme network interface using tg3 driver

Subscriber exclusive content

A Red Hat subscription provides unlimited access to our knowledgebase of over 48,000 articles and solutions.

Current Customers and Partners

Log in for full access

Log In