Microsoft has just updated KB 953156:
CPU usage increases to 100 percent on the site server after you add at least 1,000 IP address range boundaries on the central primary site for the child primary site in System Center Configuration Manager 2007
Symptoms
Consider the following scenario:
- You set up a central primary site and a child primary site in a Microsoft System Center Configuration Manager 2007 environment.
- On the central primary site, you add at least 1,000 IP address range boundaries for the child primary site.
In this scenario, the site boundaries that you added are not updated on the child primary site. Additionally, the CPU usage on the site server of the child primary site increases to 100 percent.
Full details:
http://support.microsoft.com/kb/953156