wan link manager sophos xg traditional method or SDWAN

Hi Satyabrata,

Thank you for contacting Sophos Community.

The following KBs below might help you clarify the difference between them: I've put the link below.

• WAN link manager: 
• Configure SD-WAN routes

Additional Reference:

If you just want a WAN Link failover. 

• Configure redundant internet connection using WAN Link Manager feature
• Load Balancing & Failover

but if you want a policy-based route you may use the SD-WAN

• Sophos Firewall Configure SD-WAN policy routes

Hello satyabrata bastia,

Thank you for reaching out to the community, we recommend you to read the following article which will guide you the way to configure the traditional method or even the SD-WAN: https://community.sophos.com/sophos-xg-firewall/f/recommended-reads/136192/sophos-firewall-v19-how-to-choose-the-gateway-for-a-firewall-rule