Cluster wide search, with a bit more bells and wistles:
for vmid in $(grep -l vmbr2 /etc/pve/nodes/*/qemu-server/*.conf | sed -e's/.*\///;s/.conf//');do echo -n "$vmid: ";grep ^name: /etc/pve/nodes/*/qemu-server/${vmid}.conf|cut -d\ -f2;done|sort -k2
for vmid in $( grep -l vmbr2...