Dual-WAN OVN: second uplink on same physical NIC?

LXD
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Current setup:

  • 6-node MicroCloud cluster (LXD 5.21.4 LTS, MicroOVN)
  • Single copper NIC per host for WAN, all connected to a DMZ switch
  • One ISP-provided router on the switch
  • One physical uplink network UPLINK (parent=eno8403) → one OVN network default
  • Network forwards on default route public IPs to containers

Goal:

  • Connect a second ISP-provided router to the same DMZ switch
  • Create UPLINK2 → ovn2 with its own network forwards
  • Peer routing between ovn2 and default so forwards on ovn2 reach containers on default
  • Motivation: traffic peaks approach 1 Gbit/s on the single WAN link. With two uplinks on separate chassis, we’d get 2 Gbit/s aggregate.

Problem:
Both /29 subnets are flat on the same L2 (same physical NIC, same switch). UPLINK already claims eno8403 as parent, so creating UPLINK2 with the
same parent fails the duplicate-parent check.

Options we see:

  1. Set UPLINK2 parent to lxdovn1 (the existing OVS provider bridge) — bypasses the check since it’s a different string. Can’t find anyone doing this.
  2. Managed switch with VLANs — tag each subnet, use vlan= on UPLINK2. Supported, but requires replacing our unmanaged switch.

Is (1) viable? Is there a better way?