Could you please clarify the information. From your description, I understand that you have the SVI's on the core i.e interface vlan 500 and vlan 500 extends to the 4900. In this scenario, if you plug the server into the core and have the port config...

Could you check if any traffic is captured(without encapsulation replicate) at the destination port by a PC with wireshark ?-Reghu.

Hi Fujimura,You would need to put the span destination port i.e fa0/48 in vlan 51 (switchport access vlan 51).Please check if you receive the unicast traffic once this has been configured.-Reghu.

MAC ACLs work only for non IP traffic . You cannot block IP traffic with a MAC ACL.-Reghu.

What image are you trying to upgrade to ? Does the sup recognize the new memory once it is installed ?Could you provide a complete show version from both the sup and the MSFC ?Regards,Reghu