OTV Header Format

Some consideration must be given to the MTU across the transport infrastructure. Consider the OTV packet header layout.

A 42 byte OTV header is added and the DF (Don’t Fragment) bit is set on ALL OTV packets. The DF bit is set because the Nexus 7000 does not support fragmentation and reassembly. The source VLAN ID and the Overlay ID is set, and the 802.1P priority bits from the original layer2 frame is copied to the OTV header, before the OTV packet is IP encapsulated. Increasing the MTU size of all transport interfaces are required for OTV.




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