Group entries should be removed once l3vpn deleted. This entries will be created during creation of l3vpn.

Please find the flows and groups output after deletion of VPN.

stack@compute-node1:~/devstack$ sudo ovs-ofctl dump-groups -O Openflow13 br-int
OFPST_GROUP_DESC reply (OF1.3) (xid=0x2):
group_id=150001,type=indirect,bucket=actions=set_field:fa:16:3e:6f:b7:0a->eth_dst,output:2
group_id=209999,type=all,bucket=actions=set_field:0x4->tun_id,resubmit(,55)
group_id=150002,type=indirect,bucket=actions=set_field:fa:16:3e:c5:f3:7c->eth_dst,output:3
group_id=210002,type=all,bucket=actions=set_field:0x6->tun_id,resubmit(,55),bucket=actions=set_field:0x1389->tun_id,output:1
group_id=210001,type=all,bucket=actions=set_field:0x6->tun_id,resubmit(,55)
group_id=210000,type=all,bucket=actions=set_field:0x4->tun_id,resubmit(,55),bucket=actions=set_field:0x1388->tun_id,output:1
stack@compute-node1:~/devstack$ sudo ovs-ofctl dump-flows -O Openflow13 br-int
OFPST_FLOW reply (OF1.3) (xid=0x2):
cookie=0x8000001, duration=896.350s, table=0, n_packets=203, n_bytes=21507, priority=5,in_port=1 actions=write_metadata:0x30000000000/0x1fffff0000000000,goto_table:36
cookie=0x8000000, duration=696.234s, table=0, n_packets=25, n_bytes=2434, priority=4,in_port=2 actions=write_metadata:0x40000000000/0xffffff0000000000,goto_table:16
cookie=0x8000000, duration=661.044s, table=0, n_packets=21, n_bytes=2098, priority=4,in_port=3 actions=write_metadata:0x60000000000/0xffffff0000000000,goto_table:16
cookie=0x6800000, duration=696.143s, table=16, n_packets=3, n_bytes=1014, priority=50,udp,dl_src=fa:16:3e:6f:b7:0a,tp_src=68,tp_dst=67 actions=write_actions(CONTROLLER:65535)
cookie=0x6800000, duration=661.026s, table=16, n_packets=3, n_bytes=1014, priority=50,udp,dl_src=fa:16:3e:c5:f3:7c,tp_src=68,tp_dst=67 actions=write_actions(CONTROLLER:65535)
cookie=0x6800000, duration=1011.283s, table=16, n_packets=40, n_bytes=2504, priority=0 actions=goto_table:17
cookie=0x8040000, duration=41.666s, table=17, n_packets=0, n_bytes=0, priority=3,metadata=0x60000000000/0xffffff0000000000 actions=write_metadata:0x8000061389000000/0xffffffffff000000,goto_table:50
cookie=0x8040000, duration=31.675s, table=17, n_packets=0, n_bytes=0, priority=3,metadata=0x40000000000/0xffffff0000000000 actions=write_metadata:0x8000041388000000/0xffffffffff000000,goto_table:50
cookie=0x1030000, duration=1011.283s, table=20, n_packets=0, n_bytes=0, priority=0 actions=goto_table:80
cookie=0x8000003, duration=1011.283s, table=21, n_packets=3, n_bytes=126, priority=0 actions=goto_table:80
cookie=0x9000000, duration=898.341s, table=36, n_packets=179, n_bytes=20227, priority=5,tun_id=0 actions=CONTROLLER:65535
cookie=0x9001388, duration=676.116s, table=36, n_packets=12, n_bytes=608, priority=5,tun_id=0x1388 actions=write_actions(group:210000)
cookie=0x9000004, duration=675.581s, table=36, n_packets=0, n_bytes=0, priority=5,tun_id=0x4 actions=output:2
cookie=0x9001389, duration=624.543s, table=36, n_packets=9, n_bytes=378, priority=5,tun_id=0x1389 actions=write_actions(group:210002)
cookie=0x9000006, duration=624.488s, table=36, n_packets=0, n_bytes=0, priority=5,tun_id=0x6 actions=output:3
cookie=0x8051388, duration=675.725s, table=50, n_packets=12, n_bytes=608, priority=20,metadata=0x41388000000/0x1fffffffff000000,dl_src=fa:16:3e:6f:b7:0a actions=goto_table:51
cookie=0x8051389, duration=624.493s, table=50, n_packets=9, n_bytes=378, priority=20,metadata=0x61389000000/0x1fffffffff000000,dl_src=fa:16:3e:c5:f3:7c actions=goto_table:51
cookie=0x8050000, duration=1011.283s, table=50, n_packets=0, n_bytes=0, priority=0 actions=CONTROLLER:65535,goto_table:51
cookie=0x8031388, duration=675.554s, table=51, n_packets=0, n_bytes=0, priority=20,metadata=0x1388000000/0xffff000000,dl_dst=fa:16:3e:6f:b7:0a actions=output:2
cookie=0x8031388, duration=644.650s, table=51, n_packets=0, n_bytes=0, priority=20,metadata=0x1388000000/0xffff000000,dl_dst=fa:16:3e:00:a3:b4 actions=set_field:0x5->tun_id,output:1
cookie=0x8031389, duration=624.484s, table=51, n_packets=0, n_bytes=0, priority=20,metadata=0x1389000000/0xffff000000,dl_dst=fa:16:3e:c5:f3:7c actions=output:3
cookie=0x8031389, duration=594.313s, table=51, n_packets=0, n_bytes=0, priority=20,metadata=0x1389000000/0xffff000000,dl_dst=fa:16:3e:c4:b2:59 actions=set_field:0x7->tun_id,output:1
cookie=0x8030000, duration=1011.283s, table=51, n_packets=21, n_bytes=986, priority=0 actions=goto_table:52
cookie=0x8701388, duration=676s, table=52, n_packets=12, n_bytes=608, priority=5,metadata=0x1388000000/0xffff000000 actions=write_actions(group:210000)
cookie=0x8701389, duration=624.536s, table=52, n_packets=9, n_bytes=378, priority=5,metadata=0x1389000000/0xffff000000 actions=write_actions(group:210002)
cookie=0x8800004, duration=675.758s, table=55, n_packets=12, n_bytes=608, priority=10,tun_id=0x4,metadata=0x40000000000/0x1fffff0000000000 actions=drop
cookie=0x8800006, duration=624.497s, table=55, n_packets=9, n_bytes=378, priority=10,tun_id=0x6,metadata=0x60000000000/0x1fffff0000000000 actions=drop
cookie=0x8800004, duration=675.771s, table=55, n_packets=12, n_bytes=608, priority=9,tun_id=0x4 actions=output:2
cookie=0x8800006, duration=624.501s, table=55, n_packets=9, n_bytes=378, priority=9,tun_id=0x6 actions=output:3
stack@compute-node1:~/devstack$