Some qestion in details

[swapan.samanta89]

Hello experts ,

what is cold potato and cold potato routing...

please do not mention any other link.I expect to  answers their own view

[Deepak Kumar]

Please go through the following link

https://en.wikipedia.org/wiki/Hot-potato_and_cold-potato_routing

Regards,

Deepak Kumar

[Karsten Iwen]

I expect to  answers their own view

And this is not how community forums actually work. But of course you are free to ask detailed questions after going through other documentation.

Here is one more useful link:

http://packetpushers.net/hot-cold-mash-potato-routing-and-route-reflector-design-considerations/