ifconfig looks like this on WAN
lagg0.4090: flags=8943<UP,BROADCAST,RUNNING,PROMISC,SIMPLEX,MULTICAST> metric 0 mtu 1500
	options=600003<RXCSUM,TXCSUM,RXCSUM_IPV6,TXCSUM_IPV6>
	ether <removed>
	inet6 fe80::<removed>%lagg0.4090 prefixlen 64 scopeid 0x14
	inet6 <prefix>::3 prefixlen 125
	inet6 <prefix>::2 prefixlen 125 vhid 5
	inet a.b.c.29 netmask 0xfffffff8 broadcast a.b.c.31
	inet a.b.c.28 netmask 0xfffffff8 broadcast a.b.c.31 vhid 2
	nd6 options=21<PERFORMNUD,AUTO_LINKLOCAL>
	media: Ethernet autoselect
	status: active
	vlan: 4090 vlanpcp: 0 parent interface: lagg0
	carp: MASTER vhid 2 advbase 1 advskew 0
	carp: MASTER vhid 5 advbase 1 advskew 0
	groups: vlan

and on DMZ
lagg0.4094: flags=8943<UP,BROADCAST,RUNNING,PROMISC,SIMPLEX,MULTICAST> metric 0 mtu 1500
	options=600003<RXCSUM,TXCSUM,RXCSUM_IPV6,TXCSUM_IPV6>
	ether <removed>
	inet6 fe80::<remove>%lagg0.4094 prefixlen 64 scopeid 0x18
	inet6 <prefix>:1::1 prefixlen 64
	inet a.b.c.58 netmask 0xfffffff8 broadcast a.b.c.63
	inet a.b.c.57 netmask 0xfffffff8 broadcast a.b.c.63 vhid 4
	nd6 options=21<PERFORMNUD,AUTO_LINKLOCAL>
	media: Ethernet autoselect
	status: active
	vlan: 4094 vlanpcp: 0 parent interface: lagg0
	carp: MASTER vhid 4 advbase 1 advskew 0
	groups: vlan

on our secondary node carp is in BACKUP mode.