Abstract: What is the complete attribute set of routing infrastructure is decisive before implementing new routing protocol. Having surveyed the attribute set of routing protocol concerned at present, the paper adds a new fatal attribute, symmetry and transfer, to the set mentioned above. The experiment data shows clearly that, with the policy routing mechanism of present Internet, the monbid character of IP incomplete connectivity has reached to a quite degree, in other words, it is much asymmetric and non-transferable. Furthermore, this irrational situation becomes worse remarkably with enlarged scale of Internet. It also points out that this is hard to get rid of, due to introducing ideal of AS and independent management , as well as establishing the benefit of ISP simply on competitive IP connectivity.
IP connectivity incompletion,