what is difference between ifconfig and ifup?

[mcclnx mcc <mcclnx@xxxxxxxxxxxx>]

I and testing command line to up and down ethernet connection.

if I perform following, client can not re-connect.
      ifconfig eth0 down
      ifconfig eth0 up

if I use following, client can re-connect:
      ifconfig eth0 down
      ifup eth0

What difference between "ifconfig up" and "ifup"?

thanks.
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