Need to use 2 router in active active mode

[adityasaini]

I have 2 routers R1 and R2 in the branch location and it's connected to my Datacenter over a point-2-point link from R3 and R4 from the wan side in the Lan side R1 it's connected to the wan sw-1 and from R2 it's connected to wan sw-2 from the wan switch its getting connected in criss-cross connection to my firewall which is acting in active-standby from that its going to my core-switch in criss-cross connection so I have to use the router in active-active mode what configuration need to do done on the router side for wan and Lan 

[balaji.bandi]

Make a small network diagram to understand, let us know what Router model and Switch model you have in both the sides

If the Switch is Layer3 then you can make a IGP or BGP to load-balance across the Links.

https://www.cisco.com/c/en/us/support/docs/ip/border-gateway-protocol-bgp/5212-46.html

[adityasaini]

its a digram and from R1 its connecting to DC R3 over the P2P link and from R2 its connecting to DC R4 over the P2P link 

[balaji.bandi]

I see only 2 Routers in the diagram, where are the other 2 routers  ?

Is your firewall Active / Active ? or Active Standby