Functions of the RES and GCC bytes in the ASON domain

The OSPF and RSVP protocols transmit messages through the GCC or RES bytes in OTN overhead. Control links and control channels for the ASON are created in OTN overhead (electrical-layer ASON uses RES_ODU or GCC bytes) and DCC channels (optical-layer ASON uses D4 to D12 bytes).

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