When Host-A sends traffic to Host-B, it forms Ethernet frames with MAC-B address of Host-B as the destination MAC address and sends them out to VTEP-1.
This example assumes that address learning has been done on both sides, and corresponding MAC-to-VTEP mappings exist on both VTEPs. Host-A and Host-B in VXLAN segment 10 communicate with each other through the VXLAN tunnel between VTEP-1 and VTEP-2. MAC which’s the MAC address mapped to the next-hop IP address based on the destination VTEP address in the routing table of local VTEP.ġ) Unicast Traffic:- VXLAN uses stateless tunnels between VTEPs to transmit traffic of the overlay Layer 2 network through the Layer 3 transport network, for more details An example of a VXLAN packet forwarding flow is shown in below figure:. ■ Outer Ethernet Header: contains outer source MAC which’s the MAC address of the local VTEP and outer Dest. ■ Outer IP Header: contains outer source IP which’s the local VTEP address and the outer Destination IP which’s the remote VTEP address. ■ Outer UDP Header: contains source port which Set by transmitting VTEP and calculated by performing the hash operation on the inner Ethernet frame headers and dest. ■ VLAN Header: 8 bytes contains from 24 bits as VXLAN Network Identifier (VNID) which used to identify a VXLAN segment, 8 bits for VXLAN flags and reserved fields (24 bits and 8 bits).
#Cisco show mac address bindings full
VXLAN encapsulation adds 50 bytes to the original frame, and the full packet format of VXLAN will be as below. VXLAN Encapsulation Packet Format I think it’s the correct time to discuss the VXLAN stack and its packet format, as discussed before the main target from VXLAN that extend L2 frames across an IP underlay network. Each VTEP must map each VXLAN VNI to a VLAN. – Each VTEP has to able to reach all the remote VTEPs through the underlay network,The source and destination IP addresses used for VXLAN are the Source VTEP and destination VTEP. – VTEP device is using the IP interface address to encapsulate Ethernet frames and convey these encapsulated packets over the IP underlay network. ■ IP interface to the IP transport network “ Underlay Network“. ■ Switch interface towards the local LAN segment to support local endpoint communication through bridging. – Each VTEP must map each VXLAN VNI to a VLAN, this done by VXLAN configuration. VXLAN Tunnel End Point (VTEP) – VXLAN using VXLAN tunnel endpoint (VTEP) devices to map host devices to VXLAN segments and to perform encapsulation/decapsulation. In this part we will go with a more deep in the how VXLAN work. Now the basics are in place with regards to VXLAN, In part one of this post we covered the basic theory regarding the functionality of VXLAN and its components and the reasons behind that revolution in network technologies.
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