Native VLAN on Cisco 3750x vs Cisco 2960S

Hi,
I have a scenario where I connect my Cisco switch 2960s with Cisco router 1941 as photo below
My question is when i connect router with cisco 2960s I config interface Gi1/0/1 as a trunk. everything work fine, I can ping from router to switch(172.16.29.2).
But when I changed to cisco 3750x, i config interface Gi1/0/1 as a trunk, it cannot ping from router to switch(172.16.29.2). But after I add native vlan 30 on interface Gi1/0/1 I can ping from router to switch (172.16.29.2)
Any idea why ? is there any different of native vlan on cisco 2960s and 3750x ?
Thank you for your kind answer
John

Hi John
It seems for me that the 3750 is doing what it should do, if the router do not have subinterfaces and dot1q, it will send traffic without dot1q tag, and the 3750 will drop these packets because they arrive without a tag. That's why native vlan fixes the problem.
The 2960 should work the same way that 3750 do, so I wonder if there is some differences in the config between the switches.
Can You share the config for gi0/1 on the router and also the switchportconfig for both switches.
Also a "show interface gi1/0/1 switchport" for both switches.
/Mikael

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where did you get that VLAN 60 from? Am I missing something or you made a typo?
By the way, here is my point of confusion:
Please go to this link . You'll see the following on WLC:
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no shutdown
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Cisco SF302-08P пропадает с порта trunk native vlan, когда подключаю IP PHONE.

Здравствуйте!
У меня возникла проблема с коммутатором Cisco SF302-08P. В частности проблема заключается в настройке порта для IP phone и ПК.
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exit
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Dear Marvin,
Thanks for your reply.
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hello,
I have tried with hardcode to 1000 7 Full on the ports which are connected to another switch.
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Disclaimer
The Author of this posting offers the information contained within this posting without consideration and with the reader's understanding that there's no implied or expressed suitability or fitness for any purpose. Information provided is for informational purposes only and should not be construed as rendering professional advice of any kind. Usage of this posting's information is solely at reader's own risk.
Liability Disclaimer
In no event shall Author be liable for any damages whatsoever (including, without limitation, damages for loss of use, data or profit) arising out of the use or inability to use the posting's information even if Author has been advised of the possibility of such damage.
Posting
Yes, it's possible without a straight through cable, enable auto/auto both sides. Otherwise you'll need a cross-over cable.
BTW, if your standard is hard coding copper gig ports, for speed and duplex, you might consider bringing your standard up to date. Copper gig standard went much further in how auto/auto is supposed to work. By disabling auto/auto, I believe, you're also disabling some error monitoring too. Generally, all the major players, e.g. Cisco, would recommend auto/auto for copper gig Ethernet.

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Disclaimer
The Author of this posting offers the information contained within this posting without consideration and with the reader's understanding that there's no implied or expressed suitability or fitness for any purpose. Information provided is for informational purposes only and should not be construed as rendering professional advice of any kind. Usage of this posting's information is solely at reader's own risk.
Liability Disclaimer
In no event shall Author be liable for any damages whatsoever (including, without limitation, damages for loss of use, data or profit) arising out of the use or inability to use the posting's information even if Author has been advised of the possibility of such damage.
Posting
Well if you want to connect anything with 10g to a 3750X, you're limited to using a module with 10g ports.
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As the others have noted, you can use any port for any purpose. However, if you connect a server to a 10g port, be aware you might start to see drops on your other host (gig) ports as the server will now be able send faster than the host port can receive data. To minimize this, you might either disable QoS on the switch (providing maximum buffers to all egress traffic) or you might need to tweak buffer resource settings (the default settings often drop some packets, when there are bursts, of default marked packets).

Cisco 3750x 24 port poe switch single port is faulty.

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Duplicate posts.
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Native VLAN on Cisco 3750x vs Cisco 2960S

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