Active Directory: Schema Master

Hello,

I am logged into Forest A, and when I launch schema master, it defaults to Forest A, but want I want to launch schema master for Forest B, both A and B are trusted.

How do I do this, without logging onto Forest B.

Thanks for your assistance.
Parity123Asked:
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Iamthecreator OMCommented:
There is only one schema master in a Forest; it is a forest wide role.


Description of FSMO Roles
One per Microsoft Windows Server Domain
These roles are applicable at the domain level

The PDC Emulator (Primary Domain Controller) - This role is the most used of all FSMO roles and has the widest range of functions. The domain controller that holds the PDC Emulator role is crucial in a mixed environment where Windows NT 4.0 BDCs are still present. This is because the PDC Emulator role emulates the functions of a Windows NT 4.0 PDC. But even if all Windows NT 4.0 domain controllers have been migrated to Windows 2000 or later, the domain controller that holds the PDC Emulator role still does a lot. The PDC Emulator is the domain source for time synchronization for all other domain controllers; in a multi-domain forest, the PDC Emulator in each domain synchronizes to the forest root PDC Emulator. All other domain member computers synchronize to their respective domain controllers.[3] It is critically important that computer clocks are synchronized across the forest because excessive clock skew causes Kerberos authentication to fail. In addition, all password changes occur on the PDC Emulator and receive priority replication.[4]
The RID Master - (Relative ID) This FSMO role owner is the single DC responsible for processing RID Pool requests from all DCs within a given domain. It is also responsible for moving an object from one domain to another during an interdomain object move. When a DC creates a security principal object such as a user or group, it attaches a unique SID to the object. This SID consists of a domain SID (the same for all SIDs created in a domain) and a relative ID (RID) that is unique for each security principal SID created in a domain. Each DC in a domain is allocated a pool of RIDs that it is allowed to assign to the security principals it creates. When a DC's allocated RID pool falls below a threshold, that DC issues a request for additional RIDs to the domain's RID Master FSMO role owner, the RID Master FSMO role owner responds to the request by retrieving RIDs from the domain's unallocated RID pool and assigns them to the pool of the requesting DC.
The Infrastructure Master - The purpose of this role is to ensure that cross-domain object references are correctly handled. For example, if you add a user from one domain to a security group from a different domain, the Infrastructure Master makes sure this is done properly. However, if the Active Directory deployment has only a single domain, then the Infrastructure Master role does no work at all, and even in a multi-domain environment it is rarely used except when complex user administration tasks are performed.
One per Microsoft Windows Forest of Domains[edit]
These roles are unique at enterprise level

The Schema Master - While the first three FSMO roles described above are domain-specific, the Schema Master role and the one following are forest-specific and are found only in the forest root domain (The first domain you create when you create a new forest). This means there is only one Schema Master in a forest, and the purpose of this role is to replicate schema changes to all other domain controllers in the forest. Since the schema of Active Directory is rarely changed however, the Schema Master role will rarely do any work. Typical scenarios where this role is used would be when you deploy Exchange Server onto your network, or when you upgrade domain controllers from Windows 2000 to Windows Server 2003, as these situations both involve making changes to the Active Directory schema.
The Domain Naming Master - The other forest-specific FSMO role is the Domain Naming Master, and this role also resides in the forest root domain. The Domain Naming Master role processes all changes to the namespace, for example adding the child domain vancouver.mycompany.com to the forest root domain mycompany.com requires that this role be available, so if you can't add a new child domain or new domain tree, check to make sure this role is running properly.
To summarize then, the Schema Master and Domain Naming Master roles are found only in the forest root domain, while the remaining roles are found in each domain of your forest.
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Parity123Author Commented:
Yes I understand that. Is it possible to connect to a different forest from schema snapin
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Parity123Author Commented:
I have full access to both the forests A and B
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FOXActive Directory/Exchange EngineerCommented:
Parity,
As Shivaya stated there is one Schema master per forest.  On any domain controller in Forest B open up a command prompt and type in the command
netdom query fsmo     This will tell you which domain controller in that forest holds the schema master role
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Parity123Author Commented:
Thanks but my question is it possible to connect schema to forest B while logged into Forest A by using schema snapin
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Nadav SolomonCommented:
Only if you'll run the mmc using schema admin from forest b, you cannot add user from forest a into that group since its global and not domain local group.
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Nadav SolomonCommented:
Glad I could help, thanks for the feedback.
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