To share what I've learned !

It's important to consider certain things when upgrading to a newer device. Rack Space power [ AC/ DC / socket type ( C14/C15 - C19/C20 etc) Rack type and mounting brackets and screws IOS Feature comparison does all the features supported in the newer image - double check [ sometime we downgrade the device eg: move the powerful device where most needed] Access to the technicians Interface Type and fibre patch cords [ lc / sc / fc ] , length. If we are moving the device from a different location, ensure that it is properly transported and wrapped in appropriate cartons before proceeding with the migration plan.

Following Script will work to check the reach-ability in IOS XR with source address Execute run tclsh Then you can place the TCLSH commands : set i "9.9.0.3" foreach X { 9.9.0.1 9.9.0.2 } { ping -s $i $X } Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 9.9.0.1, timeout is 2 seconds: !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 9/11/19 ms Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 9.9.0.2, timeout is 2 seconds: !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 1/2/9 ms