LSF provides you with the option to configure host groups, user groups, or both. When the membership of a host or user group changes frequently, or when the group contains a large number of members, you can use an external executable called egroup to retrieve a list of members rather than having to configure the group membership manually. You can write a site-specific egroup executable that retrieves host or user group names and the hosts or users that belong to each group.
LSF does not include a default egroup; you should write your own executable to meet the requirements of your site.