interface index assigned to the interface by vpp for a given node.
:param node: The node topology dictionary.
- :param sw_if_index: sw_if_index of the link that a interface is connected to.
+ :param sw_if_index: sw_if_index of the link that a interface is
+ connected to.
:type node: dict
:type sw_if_index: int
:returns: Interface name of the interface connected to the given link.