IPv6 IP is lost when MR44 Radio Unit connected to default interface(ens2f1) in C1 mode is rebooted.

MR44 Radio Unit reboot makes both ens2f0 and ens2f1.1191 down and when radio is up the ens2f1.1191 interface looses inet6/ipv6.

ENV : SNO with Dual Stack & using RH approved OOT drivers
They are using DHCP for IP Allocation & ens2f1,1191 is created through vlan config with ipv6 enabled.

Workaround : Node Reboot

SNO 4.12

Occuring on Customer environmwent when Radio unit is connected to ens2f1 in C1 mode. Dosen't occur when more than 1 Radio unit is connected

See "Description of problem:"

[root@ransno1 ~]# ifconfig ens2f1.1191
ens2f1.1191: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        ether 50:7c:6f:21:fe:05  txqueuelen 1000  (Ethernet)   
        RX packets 9571  bytes 1403954 (1.3 MiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 9163  bytes 973060 (950.2 KiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

ens2f1.1191: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet6 fe80::527c:6fff:fe21:fe05  prefixlen 64  scopeid 0x20<link>   ->  IPV6 is enabled 
        inet6 fd01:eab:44:1::1  prefixlen 64  scopeid 0x0<global>
        ether 50:7c:6f:21:fe:05  txqueuelen 1000  (Ethernet)
        RX packets 24279  bytes 2608198 (2.4 MiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 21891  bytes 2277834 (2.1 MiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

Slack Thread --> https://redhat-internal.slack.com/archives/CDCP2LA9L/p1692772430458189

Mavenir Ticket : https://at.mavenir.com/jira/browse/RHOCP-126