What is the configuration for the trunk port on the Cisco?  If the native vlan is set to 1, then it will egress untagged traffic to the m6220 in vlan 1.  The m6220 will drop untagged traffic in trunk mode.  To fix the, remove vlan 1 as the native vlan on the cisco and add vlan one to the trunk.  This will set the cisco to egress vlan 1 traffic as tagged.  Or you can set the the m6220 to general mode, add vlan 1 as untagged and set the pvid to 1.
Hello, I am having some issues trying to get VLAN 1 to traverse through the m6220 switch. I have looked at this post [URL]#19352067 but it hasn't seemed to work for me. We run a majority of our traffic on VLAN 1 so I'd really like if we could get this working.  Here is my current configuration: !Current Configuration:!System Description "PowerConnect M6220, 3.1.5.4, VxWorks 6.5"!System Software Version 3.1.5.4!System Operational Mode "Normal"!configurevlan databasevlan  2,564exithostname "BC_SW1"stackmember 1 1exitinterface out-of-bandip address noneip address 10.64.180.231 255.255.252.0 10.64.180.1exitip address 192.168.2.1 255.255.255.0username "root" password e6e66b8981c1030d5650da159e79539a level 15 encrypted!interface ethernet 1/g17negotiation 1000fswitchport mode trunkswitchport trunk allowed vlan add 1,564exit!interface ethernet 1/g18no negotiationspeed 1000exit!interface ethernet 1/g19no negotiationspeed 1000exit!interface ethernet 1/g20no negotiationspeed 1000exitexit This is a PoC so there is only blade in the chassis in 1/g1. 1/g17 is the only external port with something plugged in. VLANS 1 and 564 should be passed from a Cisco switch on this port.   Any suggestions would be greatly appreciated.
PC m6220 - Enable VLAN 1