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I have enabled Linux active backup mode bonding. Each interface is a gigabit interface, but the bond interface seems to end up at 100 Megabit:

bonding: bond0: Warning: failed to get speed and duplex from eth1, assumed to be 100Mb/sec and Full.
...
bnx2: eth0 NIC Link is Up, 1000 Mbps full duplex, receive & transmit flow control ON  
... 
bonding: bond0: backup interface eth1 is now up

ethtool apparently can't provide info on bond:

sudo ethtool bond0
Settings for bond0:
No data available

So does this mean I am operating at 100 or 1000 Megabit (My guess is 1000)? If it is only 100, what options in the ifcfg scripts or the modprobe bonding options do I need to sett to make it 1000?

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I don't think that ethtool would be able to provide information about a virtual interface. You would have to do it on each component interface. – Kevin M Mar 8 '10 at 16:33
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2 Answers

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Are one of your connections connected to a 100MB switch?

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All gigabit, each individual interface (bnx) negotiates at 1000 – Kyle Brandt♦ Mar 8 '10 at 19:01
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up vote 1 down vote accepted

Looks like I am at 1000, someone on the developers mailing list was kind enough to explain it:

...
Later, when the slave device asserts carrier up, bonding will
receive a notifiation, and will update the speed and duplex information
(quietly).
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