$ ip link add dev br42 type bridge
$ ip link add dev bond42 type bond
$ ip link set dev bond42 master br42
$ ip link set dev bond42 up
$ ip link set dev br42 up
$ ip -details link show
15: br42: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state
UP mode DEFAULT group default
link/ether 22:8f:91:bb:9f:09 brd ff:ff:ff:ff:ff:ff promiscuity 0
bridge forward_delay 1500 hello_time 200 max_age 2000 ageing_time
30000 stp_state 0 priority 32768 vlan_filtering 0 vlan_protocol 802.1Q
bridge_id 8000.22:8f:91:bb:9f:9 designated_root 8000.22:8f:91:bb:9f:9
root_port 0 root_path_cost 0 topology_change 0 topology_change_detected 0
hello_timer 0.00 tcn_timer 0.00 topology_change_timer 0.00
gc_timer 199.11 vlan_default_pvid 1 vlan_stats_enabled 0 group_fwd_mask 0
group_address 01:80:c2:00:00:00 mcast_snooping 1 mcast_router 1
mcast_query_use_ifaddr 0 mcast_querier 0 mcast_hash_elasticity 4096
mcast_hash_max 4096 mcast_last_member_count 2 mcast_startup_query_count 2
mcast_last_member_interval 100 mcast_membership_interval 26000
mcast_querier_interval 25500 mcast_query_interval 12500
mcast_query_response_interval 1000 mcast_startup_query_interval 3125
mcast_stats_enabled 0 mcast_igmp_version 2 mcast_mld_version 1
nf_call_iptables 0 nf_call_ip6tables 0 nf_call_arptables 0 addrgenmode
eui64
16: bond42: <BROADCAST,MULTICAST,MASTER,UP,LOWER_UP> mtu 1500 qdisc
noqueue master br42 state UNKNOWN mode DEFAULT group default
link/ether 22:8f:91:bb:9f:09 brd ff:ff:ff:ff:ff:ff promiscuity 1
bond mode 802.3ad miimon 100 updelay 0 downdelay 0 use_carrier 1
arp_interval 0 arp_validate none arp_all_targets any primary_reselect
always fail_over_mac none xmit_hash_policy layer3+4 resend_igmp 1
num_grat_arp 1 all_slaves_active 0 min_links 1 lp_interval 1
packets_per_slave 1 lacp_rate fast ad_select stable ad_actor_sys_prio
65535 ad_user_port_key 0 ad_actor_system 00:00:00:00:00:00
bridge_slave state forwarding priority 8 cost 100 hairpin off guard
off root_block off fastleave off learning on flood on port_id 0x8001
port_no 0x1 designated_port 32769 designated_cost 0 designated_bridge
8000.22:8f:91:bb:9f:9 designated_root 8000.22:8f:91:bb:9f:9 hold_timer
0.00 message_age_timer 0.00 forward_delay_timer 0.00
topology_change_ack 0 config_pending 0 proxy_arp off proxy_arp_wifi off
mcast_router 1 mcast_fast_leave off mcast_flood on neigh_suppress off
addrgenmode eui64