------- Comment From mario.alberto.gali...@ibm.com 2021-06-09 15:04 EDT-------
Steeps followed...

Updated systemd-networkd loglevel:
root@ilabg13:~# cat /etc/systemd/system/systemd-networkd.service.d/override.conf
[Service]
Environment=SYSTEMD_LOG_LEVEL=debug
root@ilabg13:~# systemctl restart systemd-networkd

Removed manually the IP:
ip addr del 192.168.171.53/24 dev enP53p0s0.171

Configure network using netplan:
root@ilabg13:~# netplan apply
root@ilabg13:~# networkctl status enP53p0s0.171 --no-pager
? 7: enP53p0s0.171
Link File: n/a
Network File: n/a
Type: vlan
State: degraded (pending)
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
Port: fibre
Address: fe80::800c:9bff:fec9:78f8

Jun 09 11:59:40 ilabg13.tuc.stglabs.ibm.com systemd-networkd[2801696]: 
enP53p0s0.171: Flags change: +UP +LOWER_UP +RUNNING +MULTICAST +BROADCAST
Jun 09 11:59:40 ilabg13.tuc.stglabs.ibm.com systemd-networkd[2801696]: 
enP53p0s0.171: Link 7 added
Jun 09 11:59:40 ilabg13.tuc.stglabs.ibm.com systemd-networkd[2801696]: 
enP53p0s0.171: link pending udev initialization...
Jun 09 11:59:40 ilabg13.tuc.stglabs.ibm.com systemd-networkd[2801696]: 
enP53p0s0.171: netdev has index 7
Jun 09 11:59:40 ilabg13.tuc.stglabs.ibm.com systemd-networkd[2801696]: 
enP53p0s0.171: Saved original MTU: 9000
Jun 09 11:59:40 ilabg13.tuc.stglabs.ibm.com systemd-networkd[2801696]: 
enP53p0s0.171: Remembering foreign address: fe80::800c:9bff:fec9:78f8/64 (valid 
forever)
Jun 09 11:59:40 ilabg13.tuc.stglabs.ibm.com systemd-networkd[2801696]: 
enP53p0s0.171: Gained IPv6LL
Jun 09 11:59:40 ilabg13.tuc.stglabs.ibm.com systemd-networkd[2801696]: 
enP53p0s0.171: Remembering route: dst: ff00::/8, src: n/a, gw: n/a, prefsrc: 
n/a, scope: glob? multicast
Jun 09 11:59:40 ilabg13.tuc.stglabs.ibm.com systemd-networkd[2801696]: 
enP53p0s0.171: Remembering route: dst: fe80::800c:9bff:fec9:78f8/128, src: n/a, 
gw: n/a, pref?ype: local
Jun 09 11:59:40 ilabg13.tuc.stglabs.ibm.com systemd-networkd[2801696]: 
enP53p0s0.171: Remembering route: dst: fe80::/64, src: n/a, gw: n/a, prefsrc: 
n/a, scope: glo?e: unicast

Manually adding IP:
root@ilabg13:~# ip addr add 192.168.171.53/24 dev enP53p0s0.171
root@ilabg13:~# networkctl status enP53p0s0.171 --no-pager
? 7: enP53p0s0.171
Link File: n/a
Network File: n/a
Type: vlan
State: routable (pending)
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
Port: fibre
Address: 192.168.171.53
fe80::800c:9bff:fec9:78f8

Jun 09 11:59:40 ilabg13.tuc.stglabs.ibm.com systemd-networkd[2801696]: 
enP53p0s0.171: Remembering foreign address: fe80::800c:9bff:fec9:78f8/64 (valid 
forever)
Jun 09 11:59:40 ilabg13.tuc.stglabs.ibm.com systemd-networkd[2801696]: 
enP53p0s0.171: Gained IPv6LL
Jun 09 11:59:40 ilabg13.tuc.stglabs.ibm.com systemd-networkd[2801696]: 
enP53p0s0.171: Remembering route: dst: ff00::/8, src: n/a, gw: n/a, prefsrc: 
n/a, scope: glob? multicast
Jun 09 11:59:40 ilabg13.tuc.stglabs.ibm.com systemd-networkd[2801696]: 
enP53p0s0.171: Remembering route: dst: fe80::800c:9bff:fec9:78f8/128, src: n/a, 
gw: n/a, pref?ype: local
Jun 09 11:59:40 ilabg13.tuc.stglabs.ibm.com systemd-networkd[2801696]: 
enP53p0s0.171: Remembering route: dst: fe80::/64, src: n/a, gw: n/a, prefsrc: 
n/a, scope: glo?e: unicast
Jun 09 12:02:03 ilabg13.tuc.stglabs.ibm.com systemd-networkd[2801696]: 
enP53p0s0.171: Remembering foreign address: 192.168.171.53/24 (valid forever)
Jun 09 12:02:03 ilabg13.tuc.stglabs.ibm.com systemd-networkd[2801696]: 
enP53p0s0.171: Remembering route: dst: 192.168.171.53/32, src: n/a, gw: n/a, 
prefsrc: 192.168?ype: local
Jun 09 12:02:03 ilabg13.tuc.stglabs.ibm.com systemd-networkd[2801696]: 
enP53p0s0.171: Remembering route: dst: 192.168.171.0/24, src: n/a, gw: n/a, 
prefsrc: 192.168.?e: unicast
Jun 09 12:02:03 ilabg13.tuc.stglabs.ibm.com systemd-networkd[2801696]: 
enP53p0s0.171: Remembering route: dst: 192.168.171.0/32, src: n/a, gw: n/a, 
prefsrc: 192.168.? broadcast
Jun 09 12:02:03 ilabg13.tuc.stglabs.ibm.com systemd-networkd[2801696]: 
enP53p0s0.171: Remembering route: dst: 192.168.171.255/32, src: n/a, gw: n/a, 
prefsrc: 192.16? broadcast

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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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