Symptom

On Nexus 9000 all SVIs remain down after exiting maintenance mode post ISSU upgrade. Example VLAN interface in problematic state: nexus9000# show interface vlan 3600 Vlan3600 is down (suspended), line protocol is down, autostate enabled nexus9000# show system internal eltm event-history vxlan-error 2023-06-26T06:27:59.067882000+00:00 [M 1] [eltm] E_DEBUG Outer Bd Alloc failed Nve ifx 0x1a005e00, Overlay state = Up v4/v6 tid (0x1 80000001 1 0) en (0 0) 2023-06-23T13:39:01.222605000+00:00 [M 1] [eltm] E_DEBUG Failed to force alloc outer_bd 16 for vxlan infra vlan 3600

Conditions

ISSU performed in maintenance mode. Issue is being hit when switch exits maintenance mode: Example of commands sequence: nexus9000(config)# system mode maintenance non-interactive nexus9000(config)# install all nxos bootflash:nxos64-cs.10.2.5.M.bin non-disruptive non-interruptive !upgrade copleted nexus9000(config)# no system mode maintenance non-interactive

Workaround

Rebooting the switch restores the SVIs.

Further Problem Description