In UT Report I have 19 entries for one MAC address, each discovered at the same time. Each entry is connected to different Devices. After checking to see what this device is, it appears to be VLAN interfaces on a 6509 Router connected to different switches. How can this be? These are not end hosts, should they be displaying in the UT report?
Pick one entry. What switch and port is it connected to? What does the show mac-address-table look like on that switch?
Typically, we see duplicates similar to this when non-Cisco gear or non-CDP gear is involved, and trunking is not being used. However, VLAN MACs are odd. Are you certain this is truly a virtual MAC? What is the MAC address?
The MAC is 00:06:52:05:f0:00, which is a Cisco device (on 6509), here is some info from the Detailed device report for the 6509, below:
There are several entries with the same MAC, different index numbers starting at 70, thru 101. These are the guys showing up as end hosts on downstream switches. Downstream switches are CISCO, and this MAC shows up on the one of switches connected to VLAN109:
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