More information on these BSDRP lab scripts available on How to build a BSDRP router lab.

Example with the bhyve lab script:

# ./BSDRP-lab-bhyve.sh -i /usr/obj/BSDRP.amd64/BSDRP-1.61-full-amd64-vga.img -n 4 -l 2
vmm module not loaded. Loading it...
nmdm module not loaded. Loading it...
if_tap module not loaded. Loading it...
BSD Router Project (http://bsdrp.net) - bhyve full-meshed lab script
Setting-up a virtual lab with 4 VM(s):
- Working directory: /tmp/BSDRP
- Each VM have 1 core(s) and 256M RAM
- Switch mode: bridge + tap
- 2 LAN(s) between all VM
- Full mesh Ethernet links between each VM
VM 1 have the following NIC:
- vtnet0 connected to VM 2.
- vtnet1 connected to VM 3.
- vtnet2 connected to VM 4.
- vtnet3 connected to LAN number 1
- vtnet4 connected to LAN number 2
VM 2 have the following NIC:
- vtnet0 connected to VM 1.
- vtnet1 connected to VM 3.
- vtnet2 connected to VM 4.
- vtnet3 connected to LAN number 1
- vtnet4 connected to LAN number 2
VM 3 have the following NIC:
- vtnet0 connected to VM 1.
- vtnet1 connected to VM 2.
- vtnet2 connected to VM 4.
- vtnet3 connected to LAN number 1
- vtnet4 connected to LAN number 2
VM 4 have the following NIC:
- vtnet0 connected to VM 1.
- vtnet1 connected to VM 2.
- vtnet2 connected to VM 3.
- vtnet3 connected to LAN number 1
- vtnet4 connected to LAN number 2
For connecting to VM'serial console, you can use:
- VM 1 : cu -l /dev/nmdm1B
- VM 2 : cu -l /dev/nmdm2B
- VM 3 : cu -l /dev/nmdm3B
- VM 4 : cu -l /dev/nmdm4B

sysrc hostname=R1 \
  kld_list+="carp" \
  ifconfig_vtnet3="inet 192.168.1.1/24" \
  ifconfig_vtnet4="inet 192.168.2.1/24" \
  ifconfig_vtnet3_alias0="inet 192.168.1.254/32 vhid 1 vrrpprio 101 pass vrid1 carpver 3" \
  ifconfig_vtnet4_alias0="inet 192.168.2.254/32 vhid 2 vrrpprio 101 pass vrid2 carpver 3"
echo 'net.inet.carp.preempt=1' >> /etc/sysctl.conf
kldload carp
service hostname restart
service netif restart
sysctl net.inet.carp.preempt=1
config save

sysrc hostname=R2 \
  kld_list+="carp" \
  ifconfig_vtnet3="inet 192.168.1.2/24" \
  ifconfig_vtnet4="inet 192.168.2.2/24" \
  ifconfig_vtnet3_alias0="inet 192.168.1.254/32 vhid 1 vrrpprio 100 pass vrid1 carpver 3" \
  ifconfig_vtnet4_alias0="inet 192.168.2.254/32 vhid 2 vrrpprio 100 pass vrid2 carpver 3"
echo 'net.inet.carp.preempt=1' >> /etc/sysctl.conf
kldload carp
service hostname restart
service netif restart
sysctl net.inet.carp.preempt=1
config save

sysrc hostname=R3 \
  ifconfig_vtnet3="inet 192.168.1.3/24" \
  defaultrouter="192.168.1.254" \
  gateway_enable=NO \
  ipv6_gateway_enable=NO
service netif restart
service routing restart
config save

sysrc hostname=R4 \
  ifconfig_vtnet4="inet 192.168.2.4/24" \
  defaultrouter="192.168.2.254" \
  gateway_enable=NO \
  ipv6_gateway_enable=NO
service netif restart
service routing restart
config save

On R1:

root@R1:~ # grep carp /var/log/messages
Feb 27 01:41:27 R1 kernel: carp: 1@vtnet3: INIT -> BACKUP (initialization complete)
Feb 27 01:41:27 R1 kernel: carp: 2@vtnet4: INIT -> BACKUP (initialization complete)
Feb 27 01:41:29 R1 kernel: carp: 1@vtnet3: BACKUP -> MASTER (preempting a slower master)
Feb 27 01:41:29 R1 kernel: carp: 2@vtnet4: BACKUP -> MASTER (preempting a slower master)

R1 is VRRP master for vrid 1 and 2.

On R2:

root@R2:~ # grep carp /var/log/messages
Feb 27 01:41:26 R2 kernel: carp: 1@vtnet3: INIT -> BACKUP (initialization complete)
Feb 27 01:41:26 R2 kernel: carp: 2@vtnet4: INIT -> BACKUP (initialization complete)
Feb 27 01:41:29 R2 kernel: carp: 1@vtnet3: BACKUP -> MASTER (master timed out)
Feb 27 01:41:29 R2 kernel: carp: 2@vtnet4: BACKUP -> MASTER (master timed out)
Feb 27 01:41:29 R2 kernel: carp: 1@vtnet3: MASTER -> BACKUP (more frequent advertisement received)
Feb 27 01:41:29 R2 kernel: carp: 2@vtnet4: MASTER -> BACKUP (more frequent advertisement received)

R2 is the VRRP backup for vrid 1 and 2.

Pinging R4 from R3:

[root@R3]~# ping 192.168.2.4
PING 192.168.2.4 (192.168.2.4): 56 data bytes
64 bytes from 192.168.2.4: icmp_seq=0 ttl=63 time=0.669 ms
64 bytes from 192.168.2.4: icmp_seq=1 ttl=63 time=0.749 ms
64 bytes from 192.168.2.4: icmp_seq=2 ttl=63 time=0.718 ms

And checking ARP cache for a VRRP MAC address (00:00:5e:00:01:xx)

root@R3:~ # arp -na | grep 192.168.1.254
? (192.168.1.254) at 00:00:5e:00:01:01 on vtnet3 expires in 1191 seconds [ethernet]

Disable one interface on R1 for changing the VRRP states:

root@R1:~ # ifconfig vtnet3 down
root@R1:~ # grep carp /var/log/messages
Feb 27 09:19:11 router kernel: carp: 1@vtnet3: MASTER -> INIT (hardware interface down)
Feb 27 09:19:11 router kernel: carp: demoted by 240 to 240 (interface down)
Feb 27 09:19:11 router kernel: carp: 2@vtnet4: MASTER -> BACKUP (more frequent advertisement received)

And check that R2 became the master:

root@R2:~ # grep carp /var/log/messages
Feb 27 09:19:11 router kernel: carp: 2@vtnet4: BACKUP -> MASTER (preempting a slower master)
Feb 27 09:19:15 router kernel: carp: 1@vtnet3: BACKUP -> MASTER (master timed out)

And check that R3 still can reach R4:

[root@R3]~#ping 192.168.2.4
PING 192.168.2.4 (192.168.2.4): 56 data bytes
64 bytes from 192.168.2.4: icmp_seq=0 ttl=63 time=0.571 ms
64 bytes from 192.168.2.4: icmp_seq=1 ttl=63 time=0.795 ms