How to connect Extremenetworks Summitx150 to a 3Com 5500G series

Today I learn a lesson that if you want to connect a Extremenetworks switch(SummitX150) to 3com 5500G series via layer 2 please remove pvid vlan management. Let say if your extremenetworks switch contain 2 vlan example vlan 2 is for pc and vlan 3 is for network management i.e. for remote access via telnet or ssh. What you need to do is to remove the pivd vlan in the interface that directly connect to extremenetworks switch.

3COM 5500G
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Please refer to the diagram below:

Extremenetworks SummitX150

How to configure it:

1- Login to 3com 5500G switch

2- Go to interface that connect to extremenetworks switch i.e. interface gigabit1/0/5

3- Enter command " undo port trunk pvid"

4 - Then enter q to exit from interface configuration

5- Don't forget to save your configuration if not if there is a power failure all your new configuration will gone.

Try to ping to extremenetworks switch ip address 192.168.20.100 it should work by now.