To protect the topology from being modified or disabled in a collaborative environment, you can lock a topology link manually. A locked topology link cannot be deleted or even overwritten after the topology is rebuilt.  

1.Log in to the Domain Management page.

2.In the Domain Management page, select Topology Link Manager from the start menu.

3.In the Topology Link Manager, click the hyperlink in the Total Topology Link column of the topology type.

4.Point to the topology link entry in the table and then click the icon to select Lock from the drop-down menu.