[c-nsp] Problem with 3750 ME Switch

[Net Guru]

Hi!,
        I am facing a strange problem with Cisco 3750 ME switch. I have a 7206 NPE-G1 whose Gig0/1 is connecting to Cisco 3750 ME as a trunk port on Fa1/0/1. I have 3 subinterfaces on that 7206. The moment I enable trunking in the 3750 the reliability at Switch end drop to somewhere around 230/255 & I start getting packet drops. During troubleshooting I made the switchport as access port and immediately the reliability comes up to 255/255 .... This is not a stray incident, its happening each and every time I enable trunking at switch side. But to note - the reliability shows absolutely OK in router side. Any specific problem with trunking ? Any suggestion ?

Thanks in advance.

NG