Please allow me to insert this addendum to my previous question. Sorry if I'm being noisy.
>From https://www.kernel.org/doc/Documentation/networking/bonding.txt 8.3. Painfully Slow Or No Failed Link Detection By Miimon --------------------------------------------------------- By default, bonding enables the use_carrier option, which instructs bonding to trust the driver to maintain carrier state. As discussed in the options section, above, some drivers do not support the netif_carrier_on/_off link state tracking system. With use_carrier enabled, bonding will always see these links as up, regardless of their actual state. Additionally, other drivers do support netif_carrier, but do not maintain it in real time, e.g., only polling the link state at some fixed interval. In this case, miimon will detect failures, but only after some long period of time has expired. If it appears that miimon is very slow in detecting link failures, try specifying use_carrier=0 to see if that improves the failure detection time. If it does, then it may be that the driver checks the carrier state at a fixed interval, but does not cache the MII register values (so the use_carrier=0 method of querying the registers directly works). If use_carrier=0 does not improve the failover, then the driver may cache the registers, or the problem may be elsewhere. Also, remember that miimon only checks for the device's carrier state. It has no way to determine the state of devices on or beyond other ports of a switch, or if a switch is refusing to pass traffic while still maintaining carrier on. OK, I thought I should make clear I'm specifying use_carrier=0, same behavior as before. -- Eduardo Grosclaude Universidad Nacional del Comahue Neuquen, Argentina
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