I have a problem with an unpractical system error message. Has anyone an idea ?
SW 1 Port GE 1/1 is configured with VLAN 66 (no trunking). This Port is connected to SW 2 Port 2/50 which is configured with VLAN 1. I think it´s a standard design to connect access switches to the distribution. But the following error occurs : %CDP-4-NATIVE_VLAN_MISMATCH.
The native VLAN is only used in combination with dot1q trunking, but I don´t use dot1q and so the error (warning) message is absolutely unnecessary. Similarly cdp only checks the "VLAN mismatch" if both switches support dot1q. With an old access switch (CatOS 5.5(16)) in the same configuration the message don´t occur. The sense escapes me. I think cdp should only check "VLAN mismatch" if dot1q is active.
With CatOS I can change the cdp logging level and this message is general disabled. It´s not fine, but work.
With Native IOS I must change the general logging level to "level 3 - ERROR". This is no solution, only a stupid work around !!!
Do anyone understand the purpose of this message or is there another solution ???
It´s a high available network with over 800 access switches. For very quick switch replacement we need a standard access switch configuration independent to the access area. Independent from this point VLAN configuration only at the distribution site has many advantages and certainly it´s not the only network with such requirements.
Go back to CDPv1 is an idea, but I think it´s not a solution for the future. The real function of this message is to avoid VLAN mismatches on dot1q trunks. So I think it´s the correct implementation that cdp only checks "native vlan mismatches" on active dot1q trunks.
If I don´t get it completely wrong, than I think it´s the right way to modify this implementation. But it´s certainly difficult to convince the cisco lap.
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