MAC Addresses Disappearing from Table Even When Aging Set to 0
I work in a hotel with hundreds of IPTVs which connect to Cisco 3750s. The TVs are on VLAN 840 and receive a multicast stream depending on what TV channel they are set to. The TVs are functioning fine. I have a list of MAC addresses of all the TVs, and I'm trying to find out which port each TV is connected to.
I initially did a show mac address-table, but the TVs' MAC addresses did not show up. I assumed that this was an aging issue so I set aging time to 0 for that VLAN and gave it some time. Still nothing in the MAC table for those devices. Finally I thought that because the communication is done via multicast then maybe the MAC addresses are never even being put in the table. I started pinging the devices, and finally the MAC addresses showed up in the table. Unfortunately the TVs will only respond to pings when they are fully powered on, so I have to send pings all day long and hope that a hotel guest has their TV on at the same time that I send the ping. However, I'm finding that in the meantime addresses are still disappearing from the table even though aging is still set to 0.
So my questions are as follows:
1. Is it expected that MAC addresses will not be recorded when multicast is used?
2. Why are entries disappearing from the table even when aging is set to 0 for that VLAN?
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