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Native VLAN Trunking on ISR

I have a Cisco 1111 router with an 801.1q trunk to a Meraki MS220 switch. on the trunk port
I made the native vlan to be the same as one of the tagged VLANs. So VLAN 10 was defined as an SVI say and on interface gi 0/1/6 native vlan was set to 10.

What I found was that on the MS220 if I set a port to type ACCESS with VLAN10 the devices wouldn't be able to get a proper IP from DHCP of the ISR nor communicate. If I set those ports instead to TRUNK then they got their address and communicated properly.

Is it the case that the native VLAN needs to NOT be one of the tagged VLANs? Or was something else likely here in play? THANKS

interface Vlan10
ip address 10.12.10.1 255.255.255.0
ip nat inside

interface GigabitEthernet0/1/6
switchport trunk native vlan 10
switchport mode trunk

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Craig Beck

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bbao

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amigan_99

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bbao - great insight. Yes that was one symptom I noted. The thin clients were getting a microsoft default address 169.254.x.x and this was showing up in the Meraki. I couldn't figure out why that was. And more to the mystery was that the thin client was attached to a polycom phone. The port was configured with a voice VLAN and the phone picked that up properly, got a proper address and was able to register to the phone service and call. But the thin client itself was not talking to the DHCP server. Now I see it better. Thank you!

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bbao

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