Here’s a solid baseconfig.txt to have your devices start with.
FOR LAB USE ONLY – NOT SECURE WHATSOEVER
This will give you simple “no login” telnet and console access to your devices.
! hostname %h ! no ip domain-lookup no ip icmp rate-limit unreachable service timestamps debug datetime msec ip tcp synwait-time 5 ! line vty 0 15 exec-timeout 0 0 logging synchronous privilege level 15 no login line con 0 exec-timeout 0 0 logging synchronous privilege level 15 no login line aux 0 exec-timeout 0 0 logging synchronous privilege level 15 no login ! ! end