%CDP-4-NATIVE_VLAN_MISMATCH: Native VLAN mismatch discovered on GigabitEthernet1/43

[hemadri37]

Dear Members,

I am getting follwoing errors continuously in ths switch.

Gi 1/43 and gi 1/42 is uplink access ports for vlan 101 and vlan 111

config is follow

interface GigabitEthernet1/42
description Uplink VLAN101
switchport access vlan 101
switchport mode access
logging event link-status
logging event trunk-status
storm-control broadcast level 1.00
storm-control action trap
end

interface GigabitEthernet1/43
description Uplink VLAN111
switchport access vlan 111
switchport mode access
logging event link-status
logging event trunk-status
storm-control broadcast level 1.00
storm-control action trap

can anyone advise on this please

Regards

Hemadri

[Mark Malone]

ok so where is g1/43 connected as the alert is saying the CDP issue is stemming from g1/43 ? so whats connected to that port and whats its config on the neighbour end

%CDP-4-NATIVE_VLAN_MISMATCH: Native VLAN mismatch discovered on GigabitEthernet1/43

[hemadri37]

Hi,

These two ports are connected to Router for uplink.

[chrihussey]

Can you provide the router config? Something is looping here.

[Mark Malone]

i would physically trace the 2 cables on port 42 and 43 as well

[hemadri37]

Hi,

Sure will trace pysically and update.

[Mark Malone]

Just curious did you get any further on this issue ?

[hemadri37]

Hi,

I couldn't check the cables physically as customer need to do this and it will take time.

Thanks for your support and advise. will surely update once i get further on this issue.

[chrihussey]

It looks like the ports are connected to each other. In other words port 42 is connected to 43 on the same switch. That's what it is saying anyway.

[Mark Malone]

yep that's what I'm thinking might be looped back through patch[panel back somehow

[hemadri37]

Hi,

Physical connectivity is ok. no loop found.

Issue not resolved.

[chrihussey]

So these ports are connected to a router. What type of router and can you post its config?

[hemadri37]

Hi,

Two switches 4948 are connected back to back on ports gi 1/1, 1/2, 1/3 & 1/4 only.

Ports gi 1/42 & gi 1/43 are connected to some servers. These ports are access ports and not trunk ports.

[hemadri37]

Hi,

I suspect that remote end port may be trunk where as local port is access.

During this case also chances of native vlan mismatch

[chrihussey]

That still would not explain why the switch sees itself across the 1/42 & 43 ports in CDP nei.

Suggest trying different ports to these servers to see if you get the same results.

Regards

[paul driver]

Hello

Youll can also get this message if the other end device is non cisco

Try turning cdp off
int x/x
no cdp enable

res
Paul