Same Vlans on two Interfaces

Hi,

not only the XG will not like it neither will the switches because you will have a loop.

You could try teaming the switches, but I am not sure how to configure the XG interfaces?

Ian

Isn't there any solution for active and backup link.

For example lets say the interface 1 is my active and interface 2 is my backup.

If interface 1 goes down the second will be active

Or a spanning tree support in the firewall?

What you haven't said is how your users are connected to both switches? What provides the IP addresses and which switch is it connected too?

Your approach is too simplistic, you need to consider traffic routing in your network before even worrying about internet access.

Are all users/servers dual homed, do you have seperate IP address ranges on each switch?

Ian

The above picture displays the basic Network.

All the interVlan routing is implemented in sophos.

The scenario that I want is If switch 1 (or the link with Fw) goes down all traffic of my internal network should go from interface 2 of sophos. 

Is there any solution for that? 

This is not a UTM issue.  Thr only way to do redundancy is with a LAG group.   Worse yet, LAG groups on multiple switches is not supported by the standard, but it is supported by some switch vendors using proprietary methods.