https://www.cisco.com/c/en/us/products/collateral/switches/nexus-9000-series-switches/white-paper-c11-732453.html VXLAN bridging: VXLAN bridging is the function provided by VTEP devices to extend a VLAN or VXLAN VNI over the Layer 3 infrastructure. Figure 3 shows VLAN-to-VLAN and VXLAN-to-VXLAN bridging. VXLAN routing: VXLAN routing is also referred to as inter-VXLAN routing. It provides IP routing service between two VXLAN VNIs in the overlay network in a way similar to inter-VLAN routing. Figure 4 shows the logical concept of VXLAN routing. https://www.cisco.com/c/en/us/td/docs/switches/datacenter/nexus5600/sw/layer2/7x/b_5600_Layer2_Config_7x/config_vxlans.html The classical Ethernet (CE) packet on an edge interface is mapped to a Virtual Network Identifier (VNI) based on the VLAN to which it is associated. The VLAN to VNI mapping is created under the VLAN configuration, which limits the number of supported VNIs on a switch to 4000. Even though 16 million VNIs are possible, is there a use case for at least 1 million VNIs ? You have to use 250+ times each of those 4000 vlans, even with 2 hosts in each vni we are looking at 2 million mac table entries.
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