We have Host A connected to switch SA and Host B connected to switch SB. Switches SA and SB connected to Catalyst 6509 via trunk with RSTP configured. There is no direct link between SA and SB. During initial IP Address acquisition (from DHCP which in different VLAN) Port on SA is being blocked by MAC address 0009.bbbc.cccc (6509 MSFC's MAC). And we had situation when port on SA was blocked by by MAC learned on SB (belongs to Host B).
This prob never occur during normal work or sturtup without DHCP request.
The prom was that we forgot to exclude one of HSRP snandby IP Address from DHCP distribution range. That's why we see MSFC MAC on SA port, Host A was givven MSFC's IP. The reason why we see alien MAC on port (non MSFC) is the same. Host B had static IP and DHCP didn't know that. From now on we know why this's happened but we got another question to CISCO EXPERTS:
IS THIS A BUG OR FEATURE ? Is it the way cisco prevent IP address duplication?
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