[AusNOG] dot1q-tunnel and cisco nexus 5000s

Lincoln Dale ltd at aristanetworks.com
Thu Mar 21 18:39:25 EST 2013

On Thu, Mar 21, 2013 at 5:19 PM, Sean K. Finn <sean.finn at ozservers.com.au>wrote:

> I, too, am interested in hearing *anyones* opinions of dragging tagged
> vlan traffic across a network like this without the use of QinQ.
> Has anyone had experiencing using other protocols, for example, Ethernet
> over IP, or VPLS or any other of the billion protocol abstractions to
> achieve something like this?

doing anything MPLS (VPLS, EoMPLS, mac-vpn-*) generally drags you into
router-port pricing and mandates you run a MPLS core.
there are numerous other ways too L2TPv3, OTV, EoMPLSoGRE (last two are the
same thing).  oh, and VXLAN.

> Does anyone have any *theories* of how to drag VLAN traffic tagged across
> a non QinQ aware switch setup, for example, over layer 3 perhaps?

i'm a big fan of this approach:
switch(config)# interface vxlan 2
switch(config-if)# vxlan multicast-group
switch(config-if)# vxlan source-interface Loopback0
switch(config-if)# vxlan vlan 51 vni 5001

vlan 51 access input port (which could be "switchport mode dot1q-tunnel")
will now magically be a point-to-multipoint wherever VXLAN VNI 5001 goes.

thats it.

it can be terminated that way on vxlan-enabled firewalls, loadbalancers,
wan accelerators, hypervisor virtual switches and - of course - vxlan
hardware gateway capable ethernet switches.


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