Symptom

Native vlan tagging not working after ISSU [ to release 6.2.10 & above] and reload. If globally tagging was enabled prior to upgrade then nexus 7k will stop tagging those packet after ISSU and reload.

Conditions

ISSU to release 6.2.10 or above.

Workaround

We have re-apply the global command, it will change the interface level configuration. N7k-2_CC(config)# no vlan dot1Q tag native Turning off vlan dot1q tag native may impact the functioning of existing dot1q tunnel ports if they exist N7k-2_CC(config)# vlan dot1Q tag native N7k-2_CC# sh running-config interface ethernet 2/22 all no switchport dot1q ethertype switchport trunk native vlan tag >>>>> switchport access vlan 1 switchport trunk native vlan 10

Further Problem Description