The preceding two sections describe operations whenever the IGMP hosts and routers all run the same version. This represents a homogenous system. But what if you have a mixture of versions in your system?
The first possible combination of versions might involve hosts with a mix of versions as in Figure 13-8, but with a version 1 query router. All IGMP operations in this scenario are driven by the version that the query router uses. When there is such a combination, the hosts must use version 1 messages. The router does not understand version 2 membership reports, nor does it understand version 2 leave messages.
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