* BridgeModule -- Allows for simple network bridge management
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功能：操作网桥
方法：
list() Returns a dictionary containing the bridges and their connected interfaces.
add_bridge(brname) Creates a new bridge named brname.
add_interface(brname, ifname) Adds interface ifname to bridge brname.
delete_bridge(brname) Deletes bridge brname.
delete_interface(brname, ifname) Removes interface ifname from bridge brname.
add_promisc_bridge(brname, ifname) Creates a new bridge brname, attaches interface ifname to it and sets the MAC address of the connected interface to FE:FF:FF:FF:FF:FF, so traffic can flow freely through the bridge. This is required for use with Xen.
up_bridge(brname) Marks bridge brname and all it's connected interfaces as up.
down_bridge(brname) Marks bridge brname and all it's connected interfaces as down
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功能：操作网桥
方法：
list() Returns a dictionary containing the bridges and their connected interfaces.
add_bridge(brname) Creates a new bridge named brname.
add_interface(brname, ifname) Adds interface ifname to bridge brname.
delete_bridge(brname) Deletes bridge brname.
delete_interface(brname, ifname) Removes interface ifname from bridge brname.
add_promisc_bridge(brname, ifname) Creates a new bridge brname, attaches interface ifname to it and sets the MAC address of the connected interface to FE:FF:FF:FF:FF:FF, so traffic can flow freely through the bridge. This is required for use with Xen.
up_bridge(brname) Marks bridge brname and all it's connected interfaces as up.
down_bridge(brname) Marks bridge brname and all it's connected interfaces as down
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