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  • 1.  Q-in-Q over VXLAN

    Posted 01-28-2022 09:30

    Hello

    I am experimenting about Q-in-Q tunneling over a VXLAN-EVPN Fabric Core and struggle getting it work.
    I followed the guidelines here : Examples: Tunneling Q-in-Q Traffic in an EVPN-VXLAN Overlay Network

    I try to achieve the following topology :


    The Q-in-Q configuration on vQFX2 :

    interfaces xe-0/0/5 {
        flexible-vlan-tagging;
        encapsulation extended-vlan-bridge;
        unit 1052 {
            vlan-id 1052;
            input-vlan-map pop;
            output-vlan-map push;
        }
    }
    
    vlans {
        transit {
            interface xe-0/0/5.1052;
            vxlan {
                vxlan vni 1052;
                vxlan encapsulate-inner-vlan;
            }
        }
    }​


    and on vQFX3 :

    interfaces xe-0/0/5 {
        flexible-vlan-tagging;
        encapsulation extended-vlan-bridge;
        unit 1052 {
            vlan-id-list 300;
        }
    }
    
    vlans {
        transit {
            interface xe-0/0/5.1052;
            vxlan {
                vxlan vni 1052;
                vxlan encapsulate-inner-vlan;
            }
        }
    }


    From vQFX1 to vQFX3 it behaves as expected. 
    But from vQFX3 to vQFX1 the trafic never gets out of vQFX3.

    Is there something I am missing or a known limitation on vQFX ?


  • 2.  RE: Q-in-Q over VXLAN

    Posted 01-31-2022 05:49
    Did some more investigations but it's still don't work.
    I tried a simple pattern having the Q-in-Q stuff on dedicated vQFX switch and only transported the trafic over my fabric (pattern traffic 3 in the fore-mentioned guide)
    The trafic is correctly handle over VXLAN but when it gets out of the egress vtep I am losing the inner vlan tag. Only S-Vlan remains.
    I begin to suspect the "decapsulate-accept-inner-vlan" to be required but not supported on vQFX.


  • 3.  RE: Q-in-Q over VXLAN

    Posted 02-01-2022 17:30
    Hi,

    Right, we were suspecting the same knob is missing,  Could please try the same command "decapsulate-accept-inner-vlan" under vlan and see if that allows and resolves the problem?

    ------------------------------
    Chirag Kachalia
    ------------------------------



  • 4.  RE: Q-in-Q over VXLAN

    Posted 02-02-2022 10:04
    Hello,

    the decapsulate-accept-inner-vlan didn't change a thing.
    I ended up trying a simple setup without vxlan : 2 vQFX with a back to back link carrying Q-in-Q traffic and I still have the same issue. packets are enscapsulated properly on the back to back link but I lose the inner vlan tag on the other end.
    Definitely looks like Q-in-Q is not functionnal on vQFX.