Load balancing distributes the testing of endpoints across all Novell ZENworks Network Access Control ESs in a cluster. Novell ZENworks Network Access Control uses a hashing algorithm based on MAC or IP addresses to divide the endpoints between the ESs.
If the MAC address is unavailable (untestable endpoint) the IP address is used to determine which ES should test an endpoint. If an ES detects an endpoint for which it is not responsible, it notifies the correct ES of the endpoint and that ES takes over testing.
If an ES fails, any services that are protected by that ES may become inaccessible, depending on the nature of the ES failure. However, the redundant services that are protected by the other ESs are still available.
HINT:Protected services are services that are running on any servers that sit on the eth1 side of the failed ES, such as AD, DNS, DHCP, NTP, file server, print server, and so on.