topic RE: EOS: L2 GRE Tunnel for several VLAN between 2 DataCenters in Network Architecture & Design

EOS: L2 GRE Tunnel for several VLAN between 2 DataCenters

M_Nees — Tue, 10 May 2016 00:52:00 GMT

we have the following szenario:
2 physically separated DataCenters.They are connected through L3 routing. in every datacenter we have one S4 VSB Chassis pair. They contain several vlans for servers. most of the servers are virtual (vmware) - but not all - the servers need both the same L2 vlan (same ip addresses) because of redundancy.

How can i setup one (or maybe several) L2 GRE Tunnels between this 2x VSB S4 chassis to connect the server vlans ? How can i get traffic of more than one vlan into the GRE tunnel ? tbp Interfaces ? Or do i need several tunnels ?

What are the current limits / experience / things to keep in mind with recent EOS (8.42)?

The EOS manual is very very poor regarding these szenario. I am looking for an config example and / or a best practise guide.

RE: EOS: L2 GRE Tunnel for several VLAN between 2 DataCenters

André_Herkenrat — Tue, 10 May 2016 09:17:00 GMT

This is exactly what VXLAN is made for. It is supported with S and K Series and the Release you are using. You need a tunnel license.

RE: EOS: L2 GRE Tunnel for several VLAN between 2 DataCenters

M_Nees — Tue, 10 May 2016 16:16:00 GMT

vxlan is one option. But i think that L2 GRE Tunnel is much easier to configure (if someone knows how) and there is no special license needed.

Does anyone able to deal with a config example ?

Regards

RE: EOS: L2 GRE Tunnel for several VLAN between 2 DataCenters

Straw__Glyn — Wed, 11 May 2016 00:06:00 GMT

Hi Matthias,

Does the following knowledge article help you ?

https://gtacknowledge.extremenetworks.com/articles/How_To/How-To-Configure-a-l2-GRE-tunnel-That-Brid...

Best Regards
Glyn

RE: EOS: L2 GRE Tunnel for several VLAN between 2 DataCenters

M_Nees — Thu, 12 May 2016 10:43:00 GMT

Hi Glyn,
thats what i am look for.

To expect the limits, stability, performance, etc. i think i have to do a lab setup.

Regards

RE: EOS: L2 GRE Tunnel for several VLAN between 2 DataCenters

Straw__Glyn — Thu, 12 May 2016 15:08:00 GMT

Hi Matthias,

Here is an article i wrote for the GRE tunnel capacity limits by product line but they are also documented in the release notes or can be seen by typing "show limits" on the product to see the limit and the number in use.

https://gtacknowledge.extremenetworks.com/articles/Q_A/How-many-GRE-tunnels-can-be-created-on-an-S-S...

Hope this helps.

Thanks
Glyn

RE: EOS: L2 GRE Tunnel for several VLAN between 2 DataCenters

Straw__Glyn — Thu, 12 May 2016 15:16:00 GMT

the firmware may not enforce the limits but if exceeded the results could be unpredictable.