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Changing allowed vlans on a trunking interface will not get reflected in show running config. But will get reflected in show interface ethernet x/x switchport command. N9K-C92348GC-X-2(config-if)# switchport trunk allowed vlan 98,102,110-111 N9K-C92348GC-X-2(config-if)# show interface ethernet 1/49 switchport Name: Ethernet1/49 Switchport: Enabled Switchport Monitor: Not enabled Switchport Isolated : Not enabled Switchport Block Multicast: Not enabled Switchport Block Unicast: Not enabled Operational Mode: trunk Access Mode VLAN: 1 (default) Trunking Native Mode VLAN: 1 (default) Trunking VLANs Allowed: 98,102,110-111 Voice VLAN: none Extended Trust State : not trusted [COS = 0] Administrative private-vlan primary host-association: none Administrative private-vlan secondary host-association: none Administrative private-vlan primary mapping: none Administrative private-vlan secondary mapping: none Administrative private-vlan trunk native VLAN: none Administrative private-vlan trunk encapsulation: dot1q Administrative private-vlan trunk normal VLANs: none Administrative private-vlan trunk private VLANs: none Operational private-vlan: none Virtual Ethernet Bridge Forwarding : Disabled Command: show running-config interface Ethernet1/49 !Running configuration last done at: Sun Mar 7 19:41:04 2021 !Time: Sun Mar 7 19:41:13 2021 version 10.1(1) Bios:version 05.40 interface Ethernet1/49 switchport switchport mode trunk no shutdown
Changing allowed vlans from default to specific, will not show change on running config. But, the configuration will take effect.
Use "show interface ethernet x/x switchport command" to verify allowed vlans on an interface instead of show run.
Changing allowed vlans on a trunking interface will not get reflected in show running config. But will get reflected in show interface ethernet x/x switchport command. Show run interface ethernet x/x all, does not reflect the change either. Only interfaces showing trunking on the "show interface ethernet X/X switchport" command will actually allow traffic through the interface. If vlan is removed not STP state will be created on that interface even if show run, shows all vlans trunking. N9K-C92348GC-X-2(config-if)# switchport trunk allowed vlan remove 102 N9K-C92348GC-X-2(config-if)# show spanning-tree vlan 102 Spanning tree instance(s) for vlan does not exist. N9K-C92348GC-X-2(config-if)# switchport trunk allowed vlan 98,102,110-111 N9K-C92348GC-X-2(config-if)# show interface ethernet 1/49 switchport Name: Ethernet1/49 Switchport: Enabled Switchport Monitor: Not enabled Switchport Isolated : Not enabled Switchport Block Multicast: Not enabled Switchport Block Unicast: Not enabled Operational Mode: trunk Access Mode VLAN: 1 (default) Trunking Native Mode VLAN: 1 (default) Trunking VLANs Allowed: 98,102,110-111 Voice VLAN: none Extended Trust State : not trusted [COS = 0] Administrative private-vlan primary host-association: none Administrative private-vlan secondary host-association: none Administrative private-vlan primary mapping: none Administrative private-vlan secondary mapping: none Administrative private-vlan trunk native VLAN: none Administrative private-vlan trunk encapsulation: dot1q Administrative private-vlan trunk normal VLANs: none Administrative private-vlan trunk private VLANs: none Operational private-vlan: none Virtual Ethernet Bridge Forwarding : Disabled Command: show running-config interface Ethernet1/49 !Running configuration last done at: Sun Mar 7 19:41:04 2021 !Time: Sun Mar 7 19:41:13 2021 version 10.1(1) Bios:version 05.40 interface Ethernet1/49 switchport switchport mode trunk no shutdown