Topology:
========
2 dpns with gre configured b/w and 4 hosts each.
Can be reproduced with single host as well.

Deleting port using ovs-vsctl del-port:
======================================
mininet@mininet-vm2:~$ sudo ovs-vsctl show
aaa4c93f-aa5a-4e41-b565-47c6f100c291
Bridge "s1"
Controller "tcp:100.96.2.129:6633"
is_connected: true
fail_mode: secure
Port "s1"
Interface "s1"
type: internal
Port "s1-gre1"
Interface "s1-gre1"
type: gre
options:

Port "s1-eth2"
Interface "s1-eth2"
Port "s1-eth3"
Interface "s1-eth3"
Port "s1-gre2"
Interface "s1-gre2"
type: gre
options:

Port "s1-eth4"
Interface "s1-eth4"
ovs_version: "2.3.90"

s1-eth1 removed from the switch s1.

Entries still present in switch:
===============================
On local dpn:
=============

mininet> dpctl dump-flows -O OpenFlow13

• • • s1 ------------------------------------------------------------------------
      OFPST_FLOW reply (OF1.3) (xid=0x2):
      cookie=0x0, duration=9216.231s, table=0, n_packets=30, n_bytes=1260, arp actions=FLOOD
      cookie=0x8000001, duration=3261.468s, table=0, n_packets=1018, n_bytes=86751, priority=10,in_port=5 actions=goto_table:20
      cookie=0x8000001, duration=3261.468s, table=0, n_packets=11, n_bytes=1078, priority=10,in_port=1 actions=write_metadata:0x1/0xffffffff,goto_table:21 -------> To be deleted
      cookie=0x8000001, duration=3261.468s, table=0, n_packets=10, n_bytes=980, priority=10,in_port=2 actions=write_metadata:0x1/0xffffffff,goto_table:21
      cookie=0x8000001, duration=3261.468s, table=0, n_packets=22, n_bytes=2156, priority=10,in_port=3 actions=write_metadata:0x2/0xffffffff,goto_table:21
      cookie=0x8000002, duration=3261.468s, table=20, n_packets=5, n_bytes=510, priority=10,mpls,mpls_label=4 actions=write_actions(group:4)
      cookie=0x8000002, duration=3261.468s, table=20, n_packets=5, n_bytes=510, priority=10,mpls,mpls_label=3 actions=write_actions(group:3)
      cookie=0x8000002, duration=3261.468s, table=20, n_packets=3, n_bytes=306, priority=10,mpls,mpls_label=5 actions=write_actions(group:5)
      cookie=0x8000003, duration=3261.468s, table=21, n_packets=4, n_bytes=392, priority=42,ip,metadata=0x1/0xffffffff,nw_dst=10.0.0.1 actions=write_actions(push_mpls:0x8847,set_field:3->mpls_label,group:3) ---------->To be deleted
      cookie=0x8000003, duration=3261.468s, table=21, n_packets=4, n_bytes=392, priority=42,ip,metadata=0x1/0xffffffff,nw_dst=10.0.0.2 actions=write_actions(push_mpls:0x8847,set_field:4->mpls_label,group:4)
      cookie=0x8000003, duration=3261.468s, table=21, n_packets=0, n_bytes=0, priority=42,ip,metadata=0x2/0xffffffff,nw_dst=11.0.0.1 actions=write_actions(push_mpls:0x8847,set_field:5->mpls_label,group:5)
      cookie=0x8000003, duration=3261.468s, table=21, n_packets=4, n_bytes=392, priority=42,ip,metadata=0x2/0xffffffff,nw_dst=11.0.0.3 actions=write_actions(push_mpls:0x8847,set_field:6->mpls_label,group:2)
      cookie=0x8000003, duration=3261.468s, table=21, n_packets=7, n_bytes=686, priority=42,ip,metadata=0x1/0xffffffff,nw_dst=10.0.0.3 actions=write_actions(push_mpls:0x8847,set_field:7->mpls_label,group:2)
      cookie=0x8000003, duration=3261.468s, table=21, n_packets=6, n_bytes=588, priority=42,ip,metadata=0x1/0xffffffff,nw_dst=10.0.0.4 actions=write_actions(push_mpls:0x8847,set_field:8->mpls_label,group:2)
      mininet> dpctl dump-groups -O OpenFlow13
    • s1 ------------------------------------------------------------------------
      OFPST_GROUP_DESC reply (OF1.3) (xid=0x2):
      group_id=4,type=indirect,bucket=weight:0,actions=pop_mpls:0x0800,set_field:00:00:00:00:00:02->eth_dst,output:2
      group_id=5,type=indirect,bucket=weight:0,actions=pop_mpls:0x0800,set_field:00:00:00:00:00:03->eth_dst,output:3
      group_id=2,type=indirect,bucket=weight:0,actions=output:5
      group_id=3,type=indirect,bucket=weight:0,actions=pop_mpls:0x0800,set_field:00:00:00:00:00:01->eth_dst,output:1 ----------->to be deleted

On remote dpn:
=============
mininet> dpctl dump-flows -O OpenFlow13

• • • s2 ------------------------------------------------------------------------
      OFPST_FLOW reply (OF1.3) (xid=0x2):
      cookie=0x0, duration=9820.616s, table=0, n_packets=30, n_bytes=1260, arp actions=FLOOD
      cookie=0x8000001, duration=3873.333s, table=0, n_packets=1145, n_bytes=97614, priority=10,in_port=5 actions=goto_table:20
      cookie=0x8000001, duration=3873.333s, table=0, n_packets=3, n_bytes=294, priority=10,in_port=3 actions=write_metadata:0x2/0xffffffff,goto_table:21
      cookie=0x8000001, duration=3873.333s, table=0, n_packets=5, n_bytes=490, priority=10,in_port=1 actions=write_metadata:0x1/0xffffffff,goto_table:21
      cookie=0x8000001, duration=3873.333s, table=0, n_packets=5, n_bytes=490, priority=10,in_port=2 actions=write_metadata:0x1/0xffffffff,goto_table:21
      cookie=0x8000002, duration=3873.333s, table=20, n_packets=4, n_bytes=408, priority=10,mpls,mpls_label=6 actions=write_actions(group:6)
      cookie=0x8000002, duration=3873.333s, table=20, n_packets=7, n_bytes=714, priority=10,mpls,mpls_label=7 actions=write_actions(group:7)
      cookie=0x8000002, duration=3873.333s, table=20, n_packets=6, n_bytes=612, priority=10,mpls,mpls_label=8 actions=write_actions(group:8)
      cookie=0x8000003, duration=3873.333s, table=21, n_packets=5, n_bytes=490, priority=42,ip,metadata=0x1/0xffffffff,nw_dst=10.0.0.1 actions=write_actions(push_mpls:0x8847,set_field:3->mpls_label,group:1) --------->to be deleted
      cookie=0x8000003, duration=3873.333s, table=21, n_packets=5, n_bytes=490, priority=42,ip,metadata=0x1/0xffffffff,nw_dst=10.0.0.2 actions=write_actions(push_mpls:0x8847,set_field:4->mpls_label,group:1)
      cookie=0x8000003, duration=3873.333s, table=21, n_packets=3, n_bytes=294, priority=42,ip,metadata=0x2/0xffffffff,nw_dst=11.0.0.1 actions=write_actions(push_mpls:0x8847,set_field:5->mpls_label,group:1)
      cookie=0x8000003, duration=3873.333s, table=21, n_packets=0, n_bytes=0, priority=42,ip,metadata=0x2/0xffffffff,nw_dst=11.0.0.3 actions=write_actions(push_mpls:0x8847,set_field:6->mpls_label,group:6)
      cookie=0x8000003, duration=3873.333s, table=21, n_packets=0, n_bytes=0, priority=42,ip,metadata=0x1/0xffffffff,nw_dst=10.0.0.3 actions=write_actions(push_mpls:0x8847,set_field:7->mpls_label,group:7)
      cookie=0x8000003, duration=3873.333s, table=21, n_packets=0, n_bytes=0, priority=42,ip,metadata=0x1/0xffffffff,nw_dst=10.0.0.4 actions=write_actions(push_mpls:0x8847,set_field:8->mpls_label,group:8)
      mininet>

Ping fails as the port is deleted:
=================================
mininet> h1 ping h2
PING 10.0.0.2 (10.0.0.2) 56(84) bytes of data.
^C
— 10.0.0.2 ping statistics —
3 packets transmitted, 0 received, 100% packet loss, time 2018ms

mininet>

From operational datastore of ietf interface:
=============================================
{
"interfaces-state": {
"interface": [

,
{
"name": "s1-eth2",
"if-index": 1,

Port is not present in the operational datastore.

Refer to frame 898 in s1.pcap for port status message with port delete reason