Cisco ip sla monitor implementation

I have a router which i want to configure ip sla monitor on. This rouer supports ip sla monitor configs.
  i intend to use the command:
  ip sla monitor 1
 type echo protocol ipIcmpEcho 80.88.145.193 source-ip addr 80.88.145.144

Please note that 80.88.145.144 is a loopback address on the router.
Now my question is : Can i use a loopback address as the source address when configuring  ip sla monitor.
 Or does it have to be a physical interface?
 In my own case, the address 80.88.145.144 is a loopback address, so i am not sure of its workability.

Also, the loopback address (80.88.145.144) from above is a tunnel(gre) destination for a remote site.So , i am not sure if i can use the same loopback address as the source address  for my ip sla monitor configuration. Or do i have to configure another loopback interface on the router say;  i

    interface loopback 2
  ip address 80.88.145.155 255.255.255.255.

Your urgent response is required .


Laolu


 
olaolusijuwolaAsked:
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lrmooreConnect With a Mentor Commented:
You can use any interface as a source address, even if it is also serving another function.
That's one of the nice things about loopbacks - they serve multiple purposes.
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