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%CDP-4-NATIVE_VLAN_MISMATCH: Native VLAN mismatch discovered on Ethernet1/1(1), with Ethernet1/13(999) + ethpm may have the correct native VLAN depending on which command is used to configure it but CDP will keep using VLAN 1 as its Native causing a mismatch between the switches: With: switchport trunk native vlan 999 F340-24-08-7700-1# show system internal ethpm info int e1/1 | i native access vlan(1), cfg_native vlan(1), native vlan(1) F340-24-08-7700-1# show cdp internal runtime-contexts interface e1/1 If_index: 0x1a000000 linux_if_index: 0x0 is_sub_intf: no primary_if_index: 0x0 num_sub_intf: 0 mac_addr: [00.da.55.a2.e9.14] enabled: yes up: yes num_v1_nbrs: 0 v2_packet_len: 0 num_back_to_back: 0 ethport_layer: 2 max_device_index: 0 cdpd_vdc_vlan_info_t: trunk_mode: 2 access_vlan: 1 native_vlan: 1 vdc_id: 2 <<<<<<< With switchport private-vlan trunk native vlan 999: F340-24-08-7700-1# show system internal ethpm info int e1/1 | i native access vlan(1), cfg_native vlan(999), native vlan(999) F340-24-08-7700-1# show cdp internal runtime-contexts interface e1/1 If_index: 0x1a000000 linux_if_index: 0x0 is_sub_intf: no primary_if_index: 0x0 num_sub_intf: 0 mac_addr: [00.da.55.a2.e9.14] enabled: yes up: yes num_v1_nbrs: 0 v2_packet_len: 0 num_back_to_back: 0 ethport_layer: 2 max_device_index: 0 cdpd_vdc_vlan_info_t: trunk_mode: 2 access_vlan: 1 native_vlan: 1 vdc_id: 2 <<<<<<<
+ switchport mode private-vlan trunk promiscuous. + Example: interface Ethernet1/1 description CONNECTION TO PEER SWITCH switchport switchport mode private-vlan trunk promiscuous <<< switchport trunk native vlan 999 <<< mtu 9216 switchport private-vlan trunk allowed vlan 199,861,999,2912,2914 switchport private-vlan mapping trunk 1600 1601 switchport private-vlan mapping trunk 1700 1701 switchport private-vlan mapping trunk 1610 1611 switchport private-vlan mapping trunk 1710 1711 channel-group 59 mode active no shutdown
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+ If we add 'switchport private-vlan trunk native vlan 999' and remove 'switchport trunk native vlan 999', issue persists + Issue persists regardless of which command is there for the Native VLAN as per the configuration guide