"""Add IP neighbor.
:param node: VPP node to add ip neighbor.
:param interface: Interface name or sw_if_index.
:param ip_address: IP address.
:param mac_address: MAC address.
"""Add IP neighbor.
:param node: VPP node to add ip neighbor.
:param interface: Interface name or sw_if_index.
:param ip_address: IP address.
:param mac_address: MAC address.