Posted on May 6, 2014 2:15 pm
 |  Asked by Raul Chen
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I have an vEOS on virtual box and I have configured the VxLAN feature by reading the User Guide.

Here are my questions:

1. VxLAN configure only specify a loopback interface as the source of Vxlan interface, so when broadcast packets come from local VMs, the Vxlan interface should encapsulate these packets and send then to remote VTEPs, at last Which actually physical Interface should send out these multicast packets? Eth1 or Eth2?

2. VxLAN can only specify one Vlan to one VNI, that means all the ports belong to this vlan will  bridge in Vxlan, is there some situtation that the downlink VM use vlan 10 and  VNI 10000 for bridge domain, and the uplink ports use vlan 10 to do routing. I mean terant and L3 trasmit network can use the same VLAN ID because they have no relationship.

Posted by Alex
Answered on May 9, 2014 3:11 pm

Hi Raul,

The loopback interface is the source IP of the VXLAN encapsulated frame. For broadcast and unknown unicast traffic that needs to be  VXLAN encapsulated the destination IP address would be the individual remote VTEP IPs which are members of the same VNI. What physical interface the VXLAN encapsulated packets are transmitted out of  will depend on the routing table of the switch and the next-hop to the destination address of the remote VTEPs.

The VLAN ID creates a single broadcast domain on the switch so you can’t re-use the same VLAN-ID to create a separate broadcast domain for the routed uplink. For the routed uplink you can either use a different VLAN ID or create a routed port on the uplink interface.


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