Native VLAN mismatch / wrong VLAN, no connectivity Networking Origin: Network OSI layer 2 · Data Link Last updated 5 Nov 2026

Networking: %CDP-4-NATIVE_VLAN_MISMATCH / device on the wrong VLAN can't reach the gateway

A port or trunk carries a different VLAN than expected, so hosts silently land on the wrong network.

Exact message you may see Native VLAN mismatch%CDP-4-NATIVE_VLAN_MISMATCH: Native VLAN mismatch discoveredVLAN mismatchWrong VLAN no network access
Explore the map of this error Full error map →
Seen on: Cisco Networking

Meaning

Compare the access VLAN on the port (show vlan brief, show interfaces trunk) with the VLAN of the gateway and DHCP scope. On trunks, both ends need the same native VLAN and the VLAN allowed on the trunk; otherwise frames are dropped or leak between networks.

Common causes

  • Access port assigned to the wrong VLAN
  • Native VLAN differs at each end of a trunk
  • VLAN not allowed on the trunk
  • VLAN missing from the switch database
  • Voice/data VLAN misconfigured

⚡ Quick fix

  1. Check the port: show interfaces Gi0/5 switchport
  2. Match native VLAN and allowed list on both trunk ends
  3. Create the VLAN on every switch in the path

Detailed fix by platform

Cisco

  1. text
    show vlan brief
show interfaces trunk
show interfaces Gi0/5 switchport | include VLAN

How to diagnose

  1. Port VLAN — Expected?
  2. Trunk native VLAN — Same at both ends?
  3. VLAN — Allowed on trunk?

🔧 Still not fixed?

Many errors look alike. If the steps above didn’t solve it, one of these is probably what you’re facing:

Where this error sits

Origin: Network. Errors that are often confused with or caused by this one (click to open):

arp -a shows (incomplete) — Networking: `arp -n` shows (incomplete) / Destination Host Unreachable — no ARP reply from the next hop (Networking)arp -a shows (incompl…Cannot assign requested address (EADDRNOTAVAIL) — Networking: connect: Cannot assign requested address — ephemeral port range exhausted by TIME_WAIT connections (Networking)Cannot assign request…DHCPDISCOVER ... No DHCPOFFERS received — Networking: dhclient: DHCPDISCOVER on eth0 ... No DHCPOFFERS received. No working leases in persistent database - sleeping. (Networking)DHCPDISCOVER ... No D…Duplex mismatch: late collisions / CRC errors — Networking: Duplex mismatch — late collisions, runts and CRC errors on the switch port (Networking)Duplex mismatch: late…MAC flapping / broadcast storm (spanning tree loop) — Networking: %SW_MATM-4-MACFLAP_NOTIF: Host is flapping between ports / broadcast storm (Networking)MAC flapping / broadc…OSPF neighbor stuck in EXSTART/EXCHANGE — Networking: %OSPF-5-ADJCHG: Nbr 10.0.0.2 from EXSTART to DOWN — OSPF neighbor stuck in EXSTART/EXCHANGE (MTU mismatch) (Networking)OSPF neighbor stuck i…Port err-disabled (psecure-violation) — Networking: %PM-4-ERR_DISABLE: psecure-violation error detected on Gi0/5, putting Gi0/5 in err-disable state (Networking)Port err-disabled (ps…Port forwarding not working (CGNAT / double NAT) — Networking: Port forwarding configured but the port stays closed — carrier-grade NAT (CGNAT) or double NAT (Networking)Port forwarding not w…Native VL…

Explore the map of this error Full error map →

🧠 Still stuck? Analyze your error

Paste the full message, response headers or stack trace — we'll detect the platform and point to the most likely cause.

💬 What worked for others

No tips yet — did something else fix this for you?

Share what worked for you

Tips are checked by an editor before they appear. Links are removed.