I have a question

Hello Selvakumar

DLB in the context of Juniper seems to include various features that have to do with both LAG and ECMP. For ECMP, the equivalent feature set is found within Cisco Express Forwarding (CEF), and you can find info about it here:
https://networklessons.com/switching/cef-cisco-express-forwarding
https://networklessons.com/cisco/ccie-enterprise-infrastructurecef-polarization
For LAG, the corresponding Cisco feature can be found in this lesson:
https://networklessons.com/switching/etherchannel-cisco-ios-catalyst-switch#Load_Balancing

Some additional resources include the following:

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I hope this has been helpful!

Laz