SDU size of 32K for streams?

Oracle 11.0.1.7
Oracle suggest that for Streams over WAN set the SDU size to 32K. Does it mean that even the switch,routers and MTU need to be 32K? I am not sure if switch or router support that size. If not then what should MTU be?
http://www.oracle.com/technology/products/dataint/pdf/twp_streams_performance_11gr1.pdf

I am not aware of anywhere in the HA docs where Oracle correlates the two. You should look in the Metalink knowledgebase and discuss this with your network admin.

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