You can use both.  Internal you will need to configure a subinterface for the 
vlan tag on isr 4xxx,

On the 39xx you can configure an svi and put the ucse port into trunk mode.

David Stanaway
[email protected]

> On Sep 9, 2017, at 8:49 PM, Lelio Fulgenzi <[email protected]> wrote:
> 
> 
> 
> I'm in the process of designing a new demployment of four ucs-E blades 
> (e140s-m2) into four ISR-G2 routers (2x3945,1x3925,1x2921).
> 
> The question I have is whether or not I can use _both_ an internal interface 
> and external interface to communicate with the blade? External for ESXi and 
> internal for guests (unity express) running on ESXi.
> 
> I'd like to use external for ESXi to stick with existing models but to also 
> remove the router internals as a failure point. The guest itself would need 
> to talk with the router internals to ensure unity express can register with 
> SRST without any infrastructure requirements.
> 
> What are people's thoughts about this?
> 
> Sent from my iPhone
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