I am finding references to SPA's with support up to 8000 vlans with restriction of 4000 for dot1q. I can't find any reference on how to use the range up to 8000. Everything says support for it, but how? Is it a new encapsulation?
It is my understanding that the 4K, 8K, etc, additional VLANs are based in the ability of the SPA (an other interfaces) of being able to define a vlan or a group of vlans from an interface directly to a Provider VLAN using QinQ (dot1q-tunnel)
For example, in ATM+VLAN, take a look at the "bridge-domain" command where you can map a group of vlan to a single provider vlan using dot1q-tunnel:
A similar approach is used in EVC ES-20 where "you can have" 32K vlans... well the truth is that at the switch your maximum will be 4094 *but* at the interface level you will have the ability to "use them":
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