RHEL8 ip route remains after deleting an ip alias

Issue

• RHEL8 ip route remains after deleting an ip alias

Sample:

[root@host /]# uname -r
4.18.0-147.el8.x86_64
[root@host /]# ip -4 addr
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
2: ens3: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
    inet 192.168.122.140/24 brd 192.168.122.255 scope global noprefixroute ens3
       valid_lft forever preferred_lft forever
[root@host /]# systemctl stop NetworkManager
[root@host /]# ip addr add 10.1.1.1/32 dev ens3
[root@host /]# ip route add 10.1.1.1/32 via 0.0.0.0 dev ens3 src 10.1.1.1
[root@host /]# ip route
default via 192.168.122.1 dev ens3 proto static metric 100
10.1.1.1 dev ens3 src 10.1.1.1
192.168.122.0/24 dev ens3 proto kernel scope link src 192.168.122.140 metric 100
[root@host /]# ip addr delete 10.1.1.1/32 dev ens3
[root@host /]# ip route
default via 192.168.122.1 dev ens3 proto static metric 100
10.1.1.1 dev ens3 src 10.1.1.1
192.168.122.0/24 dev ens3 proto kernel scope link src 192.168.122.140 metric 100
[root@host /]#

"10.1.1.1 dev ens3 src 10.1.1.1" remains after the delete of 10.1.1.1/32.