VXLAN multiple entry points

[neil_titchener]

Hi All,

I'm looking into setting up a VXLAN between two Data centres separated by e layer 3 network.  Each DC is a classic Cisco topology i.e. Core (2 L3switches), Distribution(2 switches) and Access(many).  My question is is it ok to have VNIs on each of the Distribution switches and in this classic topology are the Distribution switches the right place to put the VNIs.  Having a read through VXLN configuration my idea is to EVPN with IP Anycast to connect DCs.  Also, Should I create new VLans dedicated for VXLAN or is there no problems with adding VXLAN to existing server subnets?

Thanks in advance.

[Francesco Molino · Accepted solution]

Hi

Basically I don't see any issues having your vxlan being built in your distribution switches.

Also you can use your actual vlans or create new ones, it's to you and to what you want to achieve.

Can we get more details on your actual architecture? What are the type of devices you're using? Where are SVIs for your actual servers vlans?

[neil_titchener]

Thanks you Francesco, that was my thought.  The architecture we have at one site is a standard Cisco three tier with 8 pairs of N93k access switches connecting to two N95k Distribution switches using VPCs with all SVIs on the N95k switches.  the second site is not suitable for VXLAN in either architectures or hardware so that site will be upgraded.  If there are two entry points for VXLAN, one on each distribution switch, how is load balancing achieved as from what I've read BGP will hold ARP tables for endpoints so will both VTEPs at each site hold ARP entries for all endpoints and load balancing/distribution is achieved by whoever replies to an ARP request first?