[c-nsp] Vlan interface vs. sub-interface

[Dan Armstrong]

I've never seen a mixed L2/L3 platform that supported SVIs where you 
could make subinterfaces and set vlan encapsulation.... ?





David Coulson wrote:
> One of the big advantages of sub-interfaces over VLAN interfaces is that 
> if 'VLAN 100' on one port is a totally different network to 'VLAN 100' 
> on another. Using a sub-interface you can configure them as unique L3 
> interfaces. I've done this a lot with dot1q handoffs, and it works nicely.
>
> Is there a mechanism in place for QinQ mappings to a SVI? Never really 
> dealt with that before, but now I'm curious.
>
> David
>
> Nate wrote:
>   
>> I'm trying to put together a table of advantages (and disadvantages)
>> of a vlan interface (SVI) vs. a sub-interface of a physical port. So
>> far, I have the following.
>>
>> SVI
>> ----
>> Advantage:
>> -Ability to add redundant link to the L3 interface
>> -Better counter and statistics displayed through CLI
>>
>> Disadvantage:
>> -Need to be mindful of Spanning Tree issues on redundant links
>> -The number of SVI supported maybe limited dependent on platform?
>>
>>
>>
>> Physical port sub-interface
>> ---------------------------------
>> Advantage:
>> -Easier to configure and supported on more platforms?
>>
>>
>> Disadvantage:
>> -Inability to add L2 redundant links
>> -Statistics on CLI limited
>> -Bandwidth limited to physical port
>>
>>
>> Are there more significant advantages/disadvantages (e.g. buffer
>> limit, queue depth) that I'm missing?
>>
>> Thanks,
>> Nate
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