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There are three attributes of a UNI that effect the type of service(s) that can be defined at the User-Network Interface (UNI):

1. Service Multiplexing – A UNI can be defined to terminate exactly one service or multiple Ethernet Services. If the Service Multiplexing attribute has the value YES (enabled) then multiple Ethernet Services can terminate at the UNI. If Service Multiplexing has the value NO (disabled), then only one Ethernet Service can terminate at the UNI.
   
   If Service Multiplexing is allowed at the UNI, there needs to be a way to associate incoming frames with specific services. The MEF services use the Customer Edge VLAN ID (CE-VLAN ID) as the way to do this. The next two parameters define attributes of how the CE-VLAN IDs can be mapped to services.
   

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   Bundling Bundling

    
2. Bundling – If the Bundling attribute has the value YES (enabled) then multiple CE-VLAN IDs can be associated with an Ethernet Service at the UNI. If the Bundling attribute has the value No (disabled) then each Ethernet Service at the UNI can be associated with only one CE-VLAN ID.
    

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   All-to-one Bundling All-to-one Bundling

3. All-to-One Bundling – This is a special case of bundling in which, when enabled, all CE-VLAN IDs are mapped to one Ethernet Service. If All-to-One Bundling is YES (enabled) there there can (by definition) be only one service on the UNI and it must be a Private Service. If All-to-One Bundling is NO (disabled) then there can be one or more Virtual Private Services on the UNI.

These three attributes are inter-related and the table at right explains the valid combinations:

(Service Multiplexing = YES) ↔ (All-To-One Bundling = NO)

If multiple services can terminate at the UNI then you can't have all CE-VLAN IDs mapped to a single Ethernet Service and vice versa.

(Bundling = YES) → (All-to-One Bundling = NO)

Being able to map multiple individual CE-VLAN IDs to a single service is different than mapping all CE-VLAN IDs to a single service. So these two parameters cannot both be enabled. Note that the other direction is not a requirement, i.e. if All-To-One Bundling is NO, Bundling can be YES or NO. But,

(All-to-One Bundling = YES) → (Bundling = NO)

 Mapping all CE-VLAN IDs to a single service is different from being able to map multiple individual CE-VLAN IDs to a single service.

Bottom line is that Bundling and All-to-One Bundling cannot both be YES at a UNI, but they can both be NO.

Private and Virtual Private Services