HP, Juniper, Dell, and everyone else that I have ever worked with supports LLDP by default. While Cisco doesn’t support LLDP out of the box, it can be enabled on your Cisco gear. Link Layer Discovery Protocol, AKA 802.1AB, is an IEEE standard. Additionally, since VTP packets are only sent out trunk ports, if you see VTP packets on a port that a user should be connected to, you may have just found your problem. Since the default timer for VTP is 300 seconds, and the default timer for CDP is 60 seconds, this shouldn’t be an issue. However, VTP (VLAN Trunking Protocol) also sends packets to this address. CDPĬDP sends all packets to the L2 multicast address of 01:00:0C:CC:CC:CC. This will hopefully guide people to the best answer immediately. Since that time, I have simplified the way that I filter these packets, and based on feedback, and additional use of that information, I wanted to post an update. A couple of years ago, I wrote a short piece about filtering CDP and LLDP packets using Wireshark.
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