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On a system with five interfaces configured, I have CARP VIPs on two of them (vtnet0, vtnet1) and yet ifconfig -a prints out CARP information on vtnet0 through vtnet4. It appears to be repeating the last printed value from an interface with a VIP. Running ifconfig <if> individually, such as ifconfig vtnet4, does not print the erroneous information.

: ifconfig vtnet4

vtnet4: flags=8822<BROADCAST,SIMPLEX,MULTICAST> metric 0 mtu 1500
    options=800b8<VLAN_MTU,VLAN_HWTAGGING,JUMBO_MTU,VLAN_HWCSUM,LINKSTATE>
    ether 6a:0d:f4:88:99:f9
    media: Ethernet autoselect (10Gbase-T <full-duplex>)
    status: active
    nd6 options=21<PERFORMNUD,AUTO_LINKLOCAL>

: ifconfig -a
vtnet0: flags=8963<UP,BROADCAST,RUNNING,PROMISC,SIMPLEX,MULTICAST> metric 0 mtu 1500
    options=800b8<VLAN_MTU,VLAN_HWTAGGING,JUMBO_MTU,VLAN_HWCSUM,LINKSTATE>
    ether 7e:1d:5f:52:13:f5
    inet6 fe80::7c1d:5fff:fe52:13f5%vtnet0 prefixlen 64 scopeid 0x1
    inet 198.51.100.201 netmask 0xffffff00 broadcast 198.51.100.255
    inet 198.51.100.200 netmask 0xffffff00 broadcast 198.51.100.255 vhid 200
    carp: MASTER vhid 200 advbase 1 advskew 1
          peer 224.0.0.18 peer6 ff02::12
    media: Ethernet autoselect (10Gbase-T <full-duplex>)
    status: active
    nd6 options=21<PERFORMNUD,AUTO_LINKLOCAL>
vtnet1: flags=8963<UP,BROADCAST,RUNNING,PROMISC,SIMPLEX,MULTICAST> metric 0 mtu 1500
    options=800b8<VLAN_MTU,VLAN_HWTAGGING,JUMBO_MTU,VLAN_HWCSUM,LINKSTATE>
    ether f2:65:47:9c:58:a8
    inet6 fe80::f065:47ff:fe9c:58a8%vtnet1 prefixlen 64 scopeid 0x2
    inet 192.168.1.2 netmask 0xffffff00 broadcast 192.168.1.255
    inet 192.168.1.1 netmask 0xffffff00 broadcast 192.168.1.255 vhid 1
    carp: MASTER vhid 1 advbase 1 advskew 1
          peer 224.0.0.18 peer6 ff02::12
    media: Ethernet autoselect (10Gbase-T <full-duplex>)
    status: active
    nd6 options=21<PERFORMNUD,AUTO_LINKLOCAL>
vtnet2: flags=8822<BROADCAST,SIMPLEX,MULTICAST> metric 0 mtu 1500
    options=800b8<VLAN_MTU,VLAN_HWTAGGING,JUMBO_MTU,VLAN_HWCSUM,LINKSTATE>
    ether d6:96:4d:73:88:0e
    carp: MASTER vhid 1 advbase 1 advskew 1
          peer 224.0.0.18 peer6 ff02::12
    media: Ethernet autoselect (10Gbase-T <full-duplex>)
    status: active
    nd6 options=21<PERFORMNUD,AUTO_LINKLOCAL>
vtnet3: flags=8863<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
    description: SYNC
    options=800b8<VLAN_MTU,VLAN_HWTAGGING,JUMBO_MTU,VLAN_HWCSUM,LINKSTATE>
    ether 02:d4:51:9d:1d:b6
    inet6 fe80::d4:51ff:fe9d:1db6%vtnet3 prefixlen 64 scopeid 0x4
    inet 172.16.1.2 netmask 0xffffff00 broadcast 172.16.1.255
    carp: MASTER vhid 1 advbase 1 advskew 1
          peer 224.0.0.18 peer6 ff02::12
    media: Ethernet autoselect (10Gbase-T <full-duplex>)
    status: active
    nd6 options=21<PERFORMNUD,AUTO_LINKLOCAL>
vtnet4: flags=8822<BROADCAST,SIMPLEX,MULTICAST> metric 0 mtu 1500
    options=800b8<VLAN_MTU,VLAN_HWTAGGING,JUMBO_MTU,VLAN_HWCSUM,LINKSTATE>
    ether 6a:0d:f4:88:99:f9
    carp: MASTER vhid 1 advbase 1 advskew 1
          peer 224.0.0.18 peer6 ff02::12
    media: Ethernet autoselect (10Gbase-T <full-duplex>)
    status: active
    nd6 options=21<PERFORMNUD,AUTO_LINKLOCAL>
enc0: flags=0<> metric 0 mtu 1536
    groups: enc
    nd6 options=21<PERFORMNUD,AUTO_LINKLOCAL>
lo0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> metric 0 mtu 16384
    options=680003<RXCSUM,TXCSUM,LINKSTATE,RXCSUM_IPV6,TXCSUM_IPV6>
    inet6 ::1 prefixlen 128
    inet6 fe80::1%lo0 prefixlen 64 scopeid 0x7
    inet 127.0.0.1 netmask 0xff000000
    groups: lo
    nd6 options=21<PERFORMNUD,AUTO_LINKLOCAL>
pflog0: flags=100<PROMISC> metric 0 mtu 33152
    groups: pflog
pfsync0: flags=41<UP,RUNNING> metric 0 mtu 1500
    syncdev: vtnet3 syncpeer: 172.16.1.3 maxupd: 128 defer: off
    syncok: 1
    groups: pfsync