L2VPN – ramsgaard.me

This post will give a brief write-up on what to expect from a network perspective when using the Veeam Network Extention.

Since you found this post I don’t think an introduction is needed. But anyway. A quick write-up of the network so you can visualize how the test is performed.

Greenline indicated the L2 VPN made from both NEA to CloudGateway
The on-prem environment with 10gbit internet uplink
Service provider with multiple 10gbit internet uplinks
4ms between on-prem and service provider

Tests:

So when a replica VM has been failover and the NEA L2 is running. What to expect? Veeam does not give you any info on the performance of the NEA. Veeam support is not either able to give out a performance chart. So here a the results from ping and iperf test.

Test 1 – ping of latency over the L2 tunnel:

Ping to 185.177.120.140 showing the latency over the internet. Ping to 192.168.12.151 showing the latency over the L2 VPN.

So from a latency perspective, it seems good. Only adding 1ms to the internet latency. Which is pretty good.

Test 2 – iperf over tunnel

iperf test from a VM in service provider side to an on-prem server.

About 110Mbit, not very good compared to the internet being able of doing 10Gbit.

iperf test from VM in service provider side to an on-prem server. This time with -P 8 for 8 parallel threads.

8 threads are not giving any further bandwidth.

Test 3 – Multiple VLAN with multiple NEA

It’s always interesting to find where the bottleneck could be. Since iperf over the internet is giving a completely different result. then it must be within NEA. When I tried to do multiple VLAN bridges to the cloud resources in Cloud Director I get the same results pr NEA. Meaning it could be something in NEA or its components making the bottleneck.

The good news is off cause that you will see the same result pr NEA even when doing iperf test to the same target in the other end. So NEA will scale linearly.

A look from the Veeam Cloud Connect gateway being the broker of the L2 VPN connections.

View from the iperf server – showing the connections from the servers in the other end of L2 VPN.

Conclusion

NEA is a very helpful solution, especially when it comes to large migrations where L2 between datacenters is required meanwhile migrating. Bandwidth using this solution is not great, but I would say is ok. L2 connection should only be used shortly when doing actually migrations.

In numbers, it seems NEA will add +1ms to the latency seen over the internet between the two environments. Bandwith is between 110 to 140mbit pr sec.