The Multi-Federation Protocol Hub feature in OpenSSO Enterprise enables the Identity Provider to integrate with any existing or future service provider or service partner. The Multi-Federation Protocol Hub achieves single sign-on and single Logout regardless of which federation protocol the service provider or partner uses. Without this feature, the Identity Provider has to force the Service Providers to use a single federation protocol.
With the Multi-Federation Protocol Hub only one circle-of-trust is required when using heterogeneous Service Providers and Identity Providers in the same circle of trust. Without this feature, you must set up and configure multiple circles of trust, one for each federation protocol used. The Identity Provider could require multiple OpenSSO Enterprise instances. Each OpenSSO Enterprise would have to act as an Identity Provider, and each OpenSSO Enterprise instance would require a different protocol. To achieve single sign-on and single Logout, you would have to install some kind of intelligent proxy in front of the Identity Provider. The proxy would have to be able to recognize the incoming protocol from the Service Provider, and route the request to the correct Identity Provider instance accordingly.
The Multi-Federation Protocol Hub configuration steps are simple. The only configuration required is one extra metadata file for each protocol to be supported by the Identity Provider.