Hi, when you said there is no traffic, is it between the two VLANs or even there are no traffic within a same VLAN?Bayu Wibowo | vExpert NSX, VCIX6-DCV/NV, Cisco Champion, AWS-SAA
Author of VMware NSX Cookbook http://bit.ly/NSXCookbook
https://nz.linkedin.com/in/bayupw | twitter @bayupw
I believe you're confusing 2 different concepts. Port-Channel is to add bandwidth and HA to a common Host, with another concept 'Layer2 Trunking'.
If you only want to propagate VLans, you need to configure the ASA as 'Router-on-a-stick' without Port-Channel. Because ASA manage this interfaces as L3, you need to change it to L2 with the command 'switchport'. and the L2 'switchport mode trunk'. (Check page 4-11)
If you want to have HA, you need another set of 2 cables running (one per host) and a different Port-Channel per Host, propagating the same VLans within each Port-Channel, and the Router-on-a-stick configuration.
If you need more guidance, I'm glad to help.