I have Cisco 2921 with EHWIC-4ESG in slot0 and stack of Cisco 3750-X-24 (2 switches).Gi0/0/0 on 2921 connected to Gi1/0/11 on 3750, Gi0/0/1 on 2921 connected to Gi2/0/11 on 3750Gi0/0/0 and Gi0/0/1 was configuted as: switchport access vlan 7 switchpor...