Juniper QFX 5110

JunOS error: In routing-instance default-switch interface ae3.0 has vlan and vxlan mixed which is not supported

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You might see this error when using VXLAN on Juniper kit after you set an interface to be a member of “all” VLANs. This is because “all” includes VLAN 1. Per this documentation, you can’t actually use VLAN 1 with VXLAN but you must map it to a VNI. For example:

/* You need to map VLAN 1 to a VNI else you can't use `vlan members all` on interfaces - DO NOT USE THIS VLAN */
VLAN001 {
    vlan-id 1;
    vxlan {
        vni 1;
    }
}

Set syntax is:

set vlans VLAN001 vlan-id 1 vxlan vni 1

2 comments

  1. Hi Phil,

    Thank you for good information. I tried it but the same error was displayed, I found EVPN-VXLAN with MC-LAG is not supported. I’ll look it up about EVPN multihoming active-active mode.

    Multichassis link aggregation groups (MC-LAGs) are not supported with VXLAN.
    NOTE In an EVPN-VXLAN environment, EVPN multihoming active-active mode is used instead of MC-LAG for redundant connectivity between hosts and leaf devices.
    https://www.juniper.net/documentation/en_US/junos/topics/concept/vxlan-constraints-qfx-series.html

    1. Right – EVPN multihoming is the correct way to do HA in an EVPN+VXLAN setup. The config for it is pretty simple, it’s just a single port LACP LAG with a common ESI ID between the two switches

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