09-02-2022 01:07 PM - edited 12-12-2022 08:13 AM
--- Delete this post because I re-created post this related issue.
09-02-2022 01:27 PM
Hello,
CDP and VTP use multicast to MAC address 01:00:0c:cc:cc:cc, they are link layer (2) protocols. Can you check if the pfSense blocks that MAC address ?
09-02-2022 01:52 PM
This FW run in routed or transport mode?
09-04-2022 01:15 AM
are you making any progress on this ? Can you turn off/on CDP globally, enable debugging, and post the output of 'debug cdp adjacency' ?
Also, does the pfSense firewall log show any entries ?
09-06-2022 11:36 AM - edited 12-12-2022 08:19 AM
--deleted
09-06-2022 12:23 PM
post the output of:
show vtp status
from both the core 3750X and the L2 switch.
09-06-2022 12:38 PM - edited 12-12-2022 08:20 AM
09-06-2022 01:49 PM
Notes:-*The transparent mode ASA does not pass CDP packets packets, or any packets that do not have a valid EtherType greater than or equal to 0x600.**the traffic pass from high to low permit , traffic from low to high deny.
09-07-2022 09:19 AM
I appreciate your respond, but I am using PFSense firewall not ASA firewall.
How Cisco protocol works on other devices are connected in the middle?
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