However IS - IS is easier to expand : its use of type - length - value ( TLV ) data allows engineers to implement support for new techniques without redesigning the protocol .
OSPF has a larger set of extensions and optional features specified in the protocol standards .
IS - IS is easier to expand : its use of type - length - value ( TLV ) data allows engineers to implement support for new techniques without redesigning the protocol .
OSPF has a larger set of extensions and optional features specified in the protocol standards .