Thanks Pavel.
I can't even see any phy0xx in trigger. Where do they come from?
I do have kmod-ledtrig-netdev installed.( at least  opkg list shows the 
package) 
Here is also the device tree for that LED:
  user {            label ="wifired"            gpios = <&gpio5 23 0>           
 default-state ="on"             linux,default-trigger = "netdev"}
Thanks,Farid 

     On Tuesday, March 3, 2015 11:23 AM, Pavel Volkov 
<[email protected]> wrote:
   

 On Tuesday, March 3, 2015 8:43:52 PM MSK, Farid Farid wrote:
> What is option sysfs means? Is it the path to /sys/class/leds/?

Yes, in your case it will be 'wifired'.

> Here is the content of trigger for this LED. I am wonder if it is 
correct.
>>> cat /sys/class/leds/wifired/trigger
> [none] nand-disk mmc0 timer oneshot heartbeat backlight gpio 
> cpu0 default-on transient

You don't have "netdev" listed as a trigger so I think you should install 
kmod-ledtrig-netdev first.
Mine looks like this:
# cat /sys/class/leds/bcm47xx\:blue\:wlan/trigger 
none nand-disk timer default-on [netdev] phy0rx phy0tx phy0assoc phy0radio
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