The command "ip" cannot setting the bitrate using the CAN Bus

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Hello all:

As title, my branch is lede-17.01 of LEDE source code, when I boot in system, I issue the command as following and receive the error message:

root@LEDE:/# ip link set can0 type vcan bitrate 50000
Garbage instead of arguments "bitrate ...". Try "ip link help".

But I'm sure my ip command is base on iproute2:
root@LEDE:/# ip -V
ip utility, iproute2-ss4.4.0-8-lede

And the LEDE has no socketcan package, anybody has good idea to fix this issue? Thank you.