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Cisco NAC 4.9.2 Strange Issue

Hello all,

Hopefully someone can point me in the right direction here. I have a standalone Cisco Clean Access Server and a Cisco Access Manager connected to a 3560G 48 port switch. The CAS untrusted interface is in trunk and only allowing the NAC VLANs through. The trusted interface is in switch port mode access.

The 3560G is directly connected (L2) to a 3750x (L3) fiber switch.


The 3750x (L3) switch is connected to the core 6506 router and then the router to ASA Firewall and in the ASA to edge router out to the Internet.


The problem:


The 3750x switch crashed so I temporarily replaced it with a 3750G fiber switch, also in L3. However, after replacing the switch, any user connected to the NAC VLANs the Internet is super slow from those VLANs /SSIDs or it completely times out.


I have already cleared the ARP entries on all these devices but to no avail. Cisco TAC is also looking into it but so far they haven't found the issue. Hopefully someone in here has experienced this issue before.


Thank you,


Tony L.