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Traditionally, MAC address learning in VXLANs is achieved through flooding. In EVPN where BGP is used as the control plane for VXLANs, the problem of flooding can be eliminated through sending EVPN Type-2 advertisement between VTEPs assuming the ARP and ND suppression is enabled. In Figure 2, when Host 1 is first plugged into R1, Host 1 will start sending ARP and other basic networking packets traffic like DHCP. When R1 recives receives a packet from Host 1 for the first time, it will record its MAC address in its local MAC address table. Also, R1 will advertise an EVPN Type-2 route to R2. The route includes the local EVPN instance of R1, the VTEP IP address, the Host 1 MAC address and the L2VNI.
Packet Forwarding Process
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To verify the VXLAN tunnel information, run the command run show vxlan tunnel on Router 2.
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admin@51.134#admin@router2# run show vxlan tunnel Total number of tunnels: 3 VNI 9999, Encap:service-vlan-delete, Decap:service-vlan-add-replace src addr:134.134.134.134, dst addr:201.201.201.201, state:UP traffic type:unicast nexthops:100.1.1.201 output ports:ge-1/1/1 VNI 22221, Encap:service-vlan-delete, Decap:service-vlan-add-replace src addr:134.134.134.134, dst addr:201.201.201.201, state:UP traffic type:unicast nexthops:100.1.1.201 output ports:ge-1/1/1 VNI 22222, Encap:service-vlan-delete, Decap:service-vlan-add-replace src addr:134.134.134.134, dst addr:201.201.201.201, state:UP traffic type:unicast nexthops:100.1.1.201 output ports:ge-1/1/1 |
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