Cisco Nexus 2000 FEX Packet Flow
The packet processing on the Nexus 2000 happens in two parts: when the host send a packet to the network and when the network sends a packet to the host. Figure 3-13 shows the two scenarios.
Figure 3-13 Cisco Nexus 2000 Packet Flow
When the host sends a packet to the network (diagrams A and B), these events occur:
1. The frame arrives from the host.
2. The Cisco Nexus 2000 Series switch adds a VN-Tag, and the packet is forwarded over a fabric link using a specific VN-Tag. The Cisco Nexus 2000 Series switch adds a unique VN-Tag for each Cisco Nexus 2000 Series host interface. These are the VN-Tag field values: ...
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