Hi @atalakeytamkeen ,
"is there a way to manage these routes without adding them one by one in the virtual server static routes?" You could create summary routes. For example, if Site2 only has the 1 VPN then you could route RFC1918 traffic (10.0.0.0/8, 172.16.0.0/12, 192.168.0.0/16) over the tunnel and all else would go to the Internet. You could also create summaries tailored to your specific routes. ECMP would allow you to load balance the traffic across both circuits if desired.
You could also use a routing protocol. https://docs.paloaltonetworks.com/network-security/ipsec-vpn/administration/site-to-site-vpn-quick-configs/site-to-site-vpn-with-ospf. With regard to MPLS, configure OSPF on your trust interface. On Site1, you may need to redistribute static into OSPF. In the end, dynamic routing is easier, but it takes a while to get used to it.
"Or can PBF still be used for routing while ECMP handles the Symmetric Return?" PBF still can be used, but in the end routing is more straightforward and easier to troubleshoot.
Thanks,
Tom
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