------- Comment From [email protected] 2021-07-27 11:33 EDT-------
Enable udev monitor:
udevadm --debug monitor --property >> udevadm_reload.txt

Steeps followed to retrieve logs:

- Checking actual status of the vLan:
root@ilabg13:~# date
Tue Jul 27 08:23:47 MST 2021
root@ilabg13:~# ip addr show dev enP53p0s0.171
10: enP53p0s0.171@enP53p0s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 9000 qdisc 
noqueue state UP group default qlen 1000
link/ether 82:0c:9b:c9:78:f8 brd ff:ff:ff:ff:ff:ff
inet6 fe80::800c:9bff:fec9:78f8/64 scope link
valid_lft forever preferred_lft forever

- Reload udevadm
root@ilabg13:~# date
Tue Jul 27 08:24:22 MST 2021
root@ilabg13:~# udevadm control --reload; udevadm trigger; udevadm settle

- Try to assign ip via netplan
root@ilabg13:~# date
Tue Jul 27 08:26:01 MST 2021
root@ilabg13:~# netplan --debug apply
** (generate:3616109): DEBUG: 08:26:04.430: Processing input file 
/etc/netplan/00-installer-config.yaml..
** (generate:3616109): DEBUG: 08:26:04.431: starting new processing pass
** (generate:3616109): DEBUG: 08:26:04.431: Processing input file 
/etc/netplan/01-iscsi-config.yaml..
** (generate:3616109): DEBUG: 08:26:04.431: starting new processing pass
** (generate:3616109): DEBUG: 08:26:04.431: We have some netdefs, pass them 
through a final round of validation
** (generate:3616109): DEBUG: 08:26:04.431: encdc0: setting default backend to 1
** (generate:3616109): DEBUG: 08:26:04.431: Configuration is valid
** (generate:3616109): DEBUG: 08:26:04.431: encdb0: setting default backend to 1
** (generate:3616109): DEBUG: 08:26:04.431: Configuration is valid
** (generate:3616109): DEBUG: 08:26:04.431: ence0f: setting default backend to 1
** (generate:3616109): DEBUG: 08:26:04.431: Configuration is valid
** (generate:3616109): DEBUG: 08:26:04.431: encdb0.160: setting default backend 
to 1
** (generate:3616109): DEBUG: 08:26:04.431: Configuration is valid
** (generate:3616109): DEBUG: 08:26:04.431: enP50s3832: setting default backend 
to 1
** (generate:3616109): DEBUG: 08:26:04.431: Configuration is valid
** (generate:3616109): DEBUG: 08:26:04.431: enP53p0s0.171: setting default 
backend to 1
** (generate:3616109): DEBUG: 08:26:04.431: Configuration is valid
** (generate:3616109): DEBUG: 08:26:04.431: enP50s3832.170: setting default 
backend to 1
** (generate:3616109): DEBUG: 08:26:04.431: Configuration is valid
** (generate:3616109): DEBUG: 08:26:04.431: enP53p0s0: setting default backend 
to 1
** (generate:3616109): DEBUG: 08:26:04.431: Configuration is valid
** (generate:3616109): DEBUG: 08:26:04.431: encdc0.150: setting default backend 
to 1
** (generate:3616109): DEBUG: 08:26:04.431: Configuration is valid
** (generate:3616109): DEBUG: 08:26:04.431: Generating output files..
** (generate:3616109): DEBUG: 08:26:04.431: openvswitch: definition ence0f is 
not for us (backend 1)
** (generate:3616109): DEBUG: 08:26:04.431: NetworkManager: definition ence0f 
is not for us (backend 1)
** (generate:3616109): DEBUG: 08:26:04.431: openvswitch: definition encdb0 is 
not for us (backend 1)
** (generate:3616109): DEBUG: 08:26:04.431: NetworkManager: definition encdb0 
is not for us (backend 1)
** (generate:3616109): DEBUG: 08:26:04.432: openvswitch: definition encdc0 is 
not for us (backend 1)
** (generate:3616109): DEBUG: 08:26:04.432: NetworkManager: definition encdc0 
is not for us (backend 1)
** (generate:3616109): DEBUG: 08:26:04.432: openvswitch: definition enP50s3832 
is not for us (backend 1)
** (generate:3616109): DEBUG: 08:26:04.432: NetworkManager: definition 
enP50s3832 is not for us (backend 1)
** (generate:3616109): DEBUG: 08:26:04.432: openvswitch: definition enP53p0s0 
is not for us (backend 1)
** (generate:3616109): DEBUG: 08:26:04.432: NetworkManager: definition 
enP53p0s0 is not for us (backend 1)
** (generate:3616109): DEBUG: 08:26:04.432: openvswitch: definition encdb0.160 
is not for us (backend 1)
** (generate:3616109): DEBUG: 08:26:04.432: NetworkManager: definition 
encdb0.160 is not for us (backend 1)
** (generate:3616109): DEBUG: 08:26:04.432: openvswitch: definition encdc0.150 
is not for us (backend 1)
** (generate:3616109): DEBUG: 08:26:04.432: NetworkManager: definition 
encdc0.150 is not for us (backend 1)
** (generate:3616109): DEBUG: 08:26:04.432: openvswitch: definition 
enP53p0s0.171 is not for us (backend 1)
** (generate:3616109): DEBUG: 08:26:04.432: NetworkManager: definition 
enP53p0s0.171 is not for us (backend 1)
** (generate:3616109): DEBUG: 08:26:04.432: openvswitch: definition 
enP50s3832.170 is not for us (backend 1)
** (generate:3616109): DEBUG: 08:26:04.432: NetworkManager: definition 
enP50s3832.170 is not for us (backend 1)
(generate:3616109): GLib-DEBUG: 08:26:04.432: posix_spawn avoided (fd close 
requested)
(generate:3616109): GLib-DEBUG: 08:26:04.432: posix_spawn avoided (fd close 
requested)
DEBUG:netplan generated networkd configuration changed, restarting networkd
DEBUG:ence0f not found in {}
DEBUG:encdb0 not found in {'ence0f': {'addresses': ['9.11.116.213/24'], 
'gateway4': '9.11.116.1', 'nameservers': {'addresses': ['9.11.227.25']}}}
DEBUG:encdc0 not found in {'ence0f': {'addresses': ['9.11.116.213/24'], 
'gateway4': '9.11.116.1', 'nameservers': {'addresses': ['9.11.227.25']}}, 
'encdb0': {'addresses': ['11.111.114.213/22'], 'macaddress': 
'02:76:54:00:00:03'}}
DEBUG:enP50s3832 not found in {'ence0f': {'addresses': ['9.11.116.213/24'], 
'gateway4': '9.11.116.1', 'nameservers': {'addresses': ['9.11.227.25']}}, 
'encdb0': {'addresses': ['11.111.114.213/22'], 'macaddress': 
'02:76:54:00:00:03'}, 'encdc0': {'addresses': ['11.111.112.213/22'], 
'macaddress': '02:76:54:00:00:04'}}
DEBUG:enP53p0s0 not found in {'ence0f': {'addresses': ['9.11.116.213/24'], 
'gateway4': '9.11.116.1', 'nameservers': {'addresses': ['9.11.227.25']}}, 
'encdb0': {'addresses': ['11.111.114.213/22'], 'macaddress': 
'02:76:54:00:00:03'}, 'encdc0': {'addresses': ['11.111.112.213/22'], 
'macaddress': '02:76:54:00:00:04'}, 'enP50s3832': {'macaddress': 
'82:0c:9b:a8:a1:b2'}}
DEBUG:encdb0.160 not found in {}
DEBUG:encdc0.150 not found in {'encdb0.160': {'id': 160, 'link': 'encdb0', 
'mtu': 9000, 'addresses': ['192.168.160.53/24']}}
DEBUG:enP53p0s0.171 not found in {'encdb0.160': {'id': 160, 'link': 'encdb0', 
'mtu': 9000, 'addresses': ['192.168.160.53/24']}, 'encdc0.150': {'id': 150, 
'link': 'encdc0', 'mtu': 9000, 'addresses': ['192.168.150.53/24']}}
DEBUG:enP50s3832.170 not found in {'encdb0.160': {'id': 160, 'link': 'encdb0', 
'mtu': 9000, 'addresses': ['192.168.160.53/24']}, 'encdc0.150': {'id': 150, 
'link': 'encdc0', 'mtu': 9000, 'addresses': ['192.168.150.53/24']}, 
'enP53p0s0.171': {'id': 171, 'link': 'enP53p0s0', 'mtu': 9000, 'addresses': 
['192.168.171.53/24']}}
DEBUG:Merged config:
network:
ethernets:
enP50s3832:
macaddress: 82:0c:9b:a8:a1:b2
enP53p0s0:
macaddress: 82:0c:9b:c9:78:f8
encdb0:
addresses:
- 11.111.114.213/22
macaddress: 02:76:54:00:00:03
encdc0:
addresses:
- 11.111.112.213/22
macaddress: 02:76:54:00:00:04
ence0f:
addresses:
- 9.11.116.213/24
gateway4: 9.11.116.1
nameservers:
addresses:
- 9.11.227.25
version: 2
vlans:
enP50s3832.170:
addresses:
- 192.168.170.53/24
id: 170
link: enP50s3832
mtu: 9000
enP53p0s0.171:
addresses:
- 192.168.171.53/24
id: 171
link: enP53p0s0
mtu: 9000
encdb0.160:
addresses:
- 192.168.160.53/24
id: 160
link: encdb0
mtu: 9000
encdc0.150:
addresses:
- 192.168.150.53/24
id: 150
link: encdc0
mtu: 9000

DEBUG:no netplan generated NM configuration exists
DEBUG:ence0f not found in {}
DEBUG:encdb0 not found in {'ence0f': {'addresses': ['9.11.116.213/24'], 
'gateway4': '9.11.116.1', 'nameservers': {'addresses': ['9.11.227.25']}}}
DEBUG:encdc0 not found in {'ence0f': {'addresses': ['9.11.116.213/24'], 
'gateway4': '9.11.116.1', 'nameservers': {'addresses': ['9.11.227.25']}}, 
'encdb0': {'addresses': ['11.111.114.213/22'], 'macaddress': 
'02:76:54:00:00:03'}}
DEBUG:enP50s3832 not found in {'ence0f': {'addresses': ['9.11.116.213/24'], 
'gateway4': '9.11.116.1', 'nameservers': {'addresses': ['9.11.227.25']}}, 
'encdb0': {'addresses': ['11.111.114.213/22'], 'macaddress': 
'02:76:54:00:00:03'}, 'encdc0': {'addresses': ['11.111.112.213/22'], 
'macaddress': '02:76:54:00:00:04'}}
DEBUG:enP53p0s0 not found in {'ence0f': {'addresses': ['9.11.116.213/24'], 
'gateway4': '9.11.116.1', 'nameservers': {'addresses': ['9.11.227.25']}}, 
'encdb0': {'addresses': ['11.111.114.213/22'], 'macaddress': 
'02:76:54:00:00:03'}, 'encdc0': {'addresses': ['11.111.112.213/22'], 
'macaddress': '02:76:54:00:00:04'}, 'enP50s3832': {'macaddress': 
'82:0c:9b:a8:a1:b2'}}
DEBUG:encdb0.160 not found in {}
DEBUG:encdc0.150 not found in {'encdb0.160': {'id': 160, 'link': 'encdb0', 
'mtu': 9000, 'addresses': ['192.168.160.53/24']}}
DEBUG:enP53p0s0.171 not found in {'encdb0.160': {'id': 160, 'link': 'encdb0', 
'mtu': 9000, 'addresses': ['192.168.160.53/24']}, 'encdc0.150': {'id': 150, 
'link': 'encdc0', 'mtu': 9000, 'addresses': ['192.168.150.53/24']}}
DEBUG:enP50s3832.170 not found in {'encdb0.160': {'id': 160, 'link': 'encdb0', 
'mtu': 9000, 'addresses': ['192.168.160.53/24']}, 'encdc0.150': {'id': 150, 
'link': 'encdc0', 'mtu': 9000, 'addresses': ['192.168.150.53/24']}, 
'enP53p0s0.171': {'id': 171, 'link': 'enP53p0s0', 'mtu': 9000, 'addresses': 
['192.168.171.53/24']}}
DEBUG:Merged config:
network:
ethernets:
enP50s3832:
macaddress: 82:0c:9b:a8:a1:b2
enP53p0s0:
macaddress: 82:0c:9b:c9:78:f8
encdb0:
addresses:
- 11.111.114.213/22
macaddress: 02:76:54:00:00:03
encdc0:
addresses:
- 11.111.112.213/22
macaddress: 02:76:54:00:00:04
ence0f:
addresses:
- 9.11.116.213/24
gateway4: 9.11.116.1
nameservers:
addresses:
- 9.11.227.25
version: 2
vlans:
enP50s3832.170:
addresses:
- 192.168.170.53/24
id: 170
link: enP50s3832
mtu: 9000
enP53p0s0.171:
addresses:
- 192.168.171.53/24
id: 171
link: enP53p0s0
mtu: 9000
encdb0.160:
addresses:
- 192.168.160.53/24
id: 160
link: encdb0
mtu: 9000
encdc0.150:
addresses:
- 192.168.150.53/24
id: 150
link: encdc0
mtu: 9000

DEBUG:Link changes: {}
DEBUG:netplan triggering .link rules for lo
DEBUG:netplan triggering .link rules for ence0f
DEBUG:netplan triggering .link rules for encdc0
DEBUG:netplan triggering .link rules for encdb0
DEBUG:netplan triggering .link rules for encdb0.160
DEBUG:netplan triggering .link rules for encdc0.150
DEBUG:netplan triggering .link rules for enP50s3832
DEBUG:netplan triggering .link rules for enP53p0s0
DEBUG:netplan triggering .link rules for enP50s3832.170
DEBUG:netplan triggering .link rules for enP53p0s0.171
DEBUG:ence0f not found in {}
DEBUG:encdb0 not found in {'ence0f': {'addresses': ['9.11.116.213/24'], 
'gateway4': '9.11.116.1', 'nameservers': {'addresses': ['9.11.227.25']}}}
DEBUG:encdc0 not found in {'ence0f': {'addresses': ['9.11.116.213/24'], 
'gateway4': '9.11.116.1', 'nameservers': {'addresses': ['9.11.227.25']}}, 
'encdb0': {'addresses': ['11.111.114.213/22'], 'macaddress': 
'02:76:54:00:00:03'}}
DEBUG:enP50s3832 not found in {'ence0f': {'addresses': ['9.11.116.213/24'], 
'gateway4': '9.11.116.1', 'nameservers': {'addresses': ['9.11.227.25']}}, 
'encdb0': {'addresses': ['11.111.114.213/22'], 'macaddress': 
'02:76:54:00:00:03'}, 'encdc0': {'addresses': ['11.111.112.213/22'], 
'macaddress': '02:76:54:00:00:04'}}
DEBUG:enP53p0s0 not found in {'ence0f': {'addresses': ['9.11.116.213/24'], 
'gateway4': '9.11.116.1', 'nameservers': {'addresses': ['9.11.227.25']}}, 
'encdb0': {'addresses': ['11.111.114.213/22'], 'macaddress': 
'02:76:54:00:00:03'}, 'encdc0': {'addresses': ['11.111.112.213/22'], 
'macaddress': '02:76:54:00:00:04'}, 'enP50s3832': {'macaddress': 
'82:0c:9b:a8:a1:b2'}}
DEBUG:encdb0.160 not found in {}
DEBUG:encdc0.150 not found in {'encdb0.160': {'id': 160, 'link': 'encdb0', 
'mtu': 9000, 'addresses': ['192.168.160.53/24']}}
DEBUG:enP53p0s0.171 not found in {'encdb0.160': {'id': 160, 'link': 'encdb0', 
'mtu': 9000, 'addresses': ['192.168.160.53/24']}, 'encdc0.150': {'id': 150, 
'link': 'encdc0', 'mtu': 9000, 'addresses': ['192.168.150.53/24']}}
DEBUG:enP50s3832.170 not found in {'encdb0.160': {'id': 160, 'link': 'encdb0', 
'mtu': 9000, 'addresses': ['192.168.160.53/24']}, 'encdc0.150': {'id': 150, 
'link': 'encdc0', 'mtu': 9000, 'addresses': ['192.168.150.53/24']}, 
'enP53p0s0.171': {'id': 171, 'link': 'enP53p0s0', 'mtu': 9000, 'addresses': 
['192.168.171.53/24']}}
DEBUG:Merged config:
network:
ethernets:
enP50s3832:
macaddress: 82:0c:9b:a8:a1:b2
enP53p0s0:
macaddress: 82:0c:9b:c9:78:f8
encdb0:
addresses:
- 11.111.114.213/22
macaddress: 02:76:54:00:00:03
encdc0:
addresses:
- 11.111.112.213/22
macaddress: 02:76:54:00:00:04
ence0f:
addresses:
- 9.11.116.213/24
gateway4: 9.11.116.1
nameservers:
addresses:
- 9.11.227.25
version: 2
vlans:
enP50s3832.170:
addresses:
- 192.168.170.53/24
id: 170
link: enP50s3832
mtu: 9000
enP53p0s0.171:
addresses:
- 192.168.171.53/24
id: 171
link: enP53p0s0
mtu: 9000
encdb0.160:
addresses:
- 192.168.160.53/24
id: 160
link: encdb0
mtu: 9000
encdc0.150:
addresses:
- 192.168.150.53/24
id: 150
link: encdc0
mtu: 9000

- Checking results
root@ilabg13:~# date
Tue Jul 27 08:27:11 MST 2021
root@ilabg13:~# ip addr show dev enP53p0s0.171
10: enP53p0s0.171@enP53p0s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 9000 qdisc 
noqueue state UP group default qlen 1000
link/ether 82:0c:9b:c9:78:f8 brd ff:ff:ff:ff:ff:ff
inet 192.168.171.53/24 brd 192.168.171.255 scope global enP53p0s0.171
valid_lft forever preferred_lft forever
inet6 fe80::800c:9bff:fec9:78f8/64 scope link
valid_lft forever preferred_lft forever
root@ilabg13:~# networkctl status enP53p0s0.171 --no-pager
? 10: enP53p0s0.171
Link File: /usr/lib/systemd/network/99-default.link
Network File: /run/systemd/network/10-netplan-enP53p0s0.171.network
Type: vlan
State: routable (configured)
Driver: 802.1Q VLAN Support
HW Address: 82:0c:9b:c9:78:f8
MTU: 9000 (max: 65535)
Queue Length (Tx/Rx): 1/1
Auto negotiation: yes
Speed: 25Gbps
Duplex: full
Address: 192.168.171.53
fe80::800c:9bff:fec9:78f8
Activation Policy: up
Required For Online: yes

Jul 27 08:26:09 ilabg13.tuc.stglabs.ibm.com systemd-networkd[3616209]: 
enP53p0s0.171: Discovering IPv6 routers
Jul 27 08:26:09 ilabg13.tuc.stglabs.ibm.com systemd-networkd[3616209]: 
enP53p0s0.171: State changed: pending -> configuring
Jul 27 08:26:09 ilabg13.tuc.stglabs.ibm.com systemd-networkd[3616209]: 
enP53p0s0.171: Setting addresses
Jul 27 08:26:09 ilabg13.tuc.stglabs.ibm.com systemd-networkd[3616209]: 
enP53p0s0.171: Remembering updated address: 192.168.171.53/24 (valid forever)
Jul 27 08:26:09 ilabg13.tuc.stglabs.ibm.com systemd-networkd[3616209]: 
enP53p0s0.171: Remembering route: dst: 192.168.171.53/32, src: n/a, gw: n/a, 
prefsrc: 192.168.171.53, sco? type: local
Jul 27 08:26:09 ilabg13.tuc.stglabs.ibm.com systemd-networkd[3616209]: 
enP53p0s0.171: Remembering route: dst: 192.168.171.255/32, src: n/a, gw: n/a, 
prefsrc: 192.168.171.53, sc?e: broadcast
Jul 27 08:26:09 ilabg13.tuc.stglabs.ibm.com systemd-networkd[3616209]: 
enP53p0s0.171: Remembering route: dst: 192.168.171.0/24, src: n/a, gw: n/a, 
prefsrc: 192.168.171.53, scop?ype: unicast
Jul 27 08:26:09 ilabg13.tuc.stglabs.ibm.com systemd-networkd[3616209]: 
enP53p0s0.171: Remembering route: dst: 192.168.171.0/32, src: n/a, gw: n/a, 
prefsrc: 192.168.171.53, scop?e: broadcast
Jul 27 08:26:09 ilabg13.tuc.stglabs.ibm.com systemd-networkd[3616209]: 
enP53p0s0.171: Addresses set
Jul 27 08:26:09 ilabg13.tuc.stglabs.ibm.com systemd-networkd[3616209]: 
enP53p0s0.171: State changed: configuring -> configured

IP was assigned correctly!!!

- Retrieve journalctl logs
journalctl --since today -u systemd-networkd -u systemd-udevd --no-pager > 
journalctl_udev_reload.txt

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https://bugs.launchpad.net/bugs/1929657

Title:
  [Ubuntu 20.4.2]  vLan not getting static IP assigned (on s390x)

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