I currently have Multicasting (PIM-sparse-dense-mode/CGMP) enabled on my MSFC's ... and in all my Access Layer switches (Cat4006/Layer 2), but nothing on my Cat 6509 (since I have no clients that need to join any multicast groups)... I am seeing a TON of Syslog CGMP join messages in CiscoWorks even when I'm not running any multicasting applications... this is happening on 2 of my switches that have Macintosh clients running on them... I'm assuming it's the Appletalk since it uses multicasting, but CGMP join messages in my Syslog?????!!!!!! Also seeing an "Invalid Multicast address from source MAC address #.#.# on port #/#" Any ideas? Thanks in advance, Jeff Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=2001&t=2001 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]