Here’s yet another way to generate loopback interfaces using Tcl. This time we add interfaces from a custom list of subnet IDs.
Fredrik Holmberg
Network Consultant 
Category: loopback
When doing networking labs you often need to configure a series of loopback interfaces to simulate connected subnets and so on. Configuring them manually on every router or using Notepad with search and replace can be a pain. Here’s another way to do it!
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