Peer Exchange. While single-source mechanisms usually make the most sense for asymmetric benign systems, there may be situations where they do not. The most likely encountered such situation is when the hosts cannot be constrained to the asymmetric benign model. When single-source mechanisms can’t be used, some form of peer exchange is needed. These exchanges will have to follow the more classical Byzantine exchange algorithms. But, it does help that the underlying network is asymmetric benign (at least in the switches). An efficient hardware-assisted exchange mechanism that exploits the asymmetric benign failure property of TTEthernet and hierarchical agreement is given in section 6.3 below.
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