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cat >> /etc/ssh/ssh_config
  Host *
          GSSAPIAuthentication yes
  #       KexAlgorithms=diffie-hellman-group14-sha1
          KexAlgorithms=curve25519-sha256@libssh.org,ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2- 
  nistp521,diffie-hellman-group-exchange-sha256,diffie-hellman-group14-sha1,diffie-hellman-group1-sha1
        
cat > topology.yml
  provider: libvirt
  defaults:
    device: csr
  nodes: [ r1, r2 ]
  links: [ r1, r2, r1-r2 ]


  hostname csr
  no ip domain lookup
  ip domain name lab.local
  !
  no service config
  !
  crypto key generate rsa modulus 2048
  ip ssh version 2
  !
  aaa new-model
  !
  aaa authentication login default local
  aaa authorization exec default local
  !
  username vagrant privilege 15 secret vagrant
  !
  ip ssh pubkey-chain
   username vagrant
    key-hash ssh-rsa DD3BB82E850406E9ABFFA80AC0046ED6
  !
  vrf definition MGMT
   description Management interface
   !
   address-family ipv4
   exit-address-family
  !
  interface GigabitEthernet1
   vrf forwarding MGMT
   description vagrant-management
   ip address dhcp
   no shutdown
  !
  line vty 0 4
   transport input ssh
  !
  
  event manager applet ENABLE-MGMT
   event syslog pattern "SYS-5-RESTART"
   action 0 cli command "enable"
   action 1 cli command "conf t"
   action 2 cli command "crypto key generate rsa modulus 2048"
   action 3 cli command "interface GigabitEthernet0/0"
   action 4 cli command "no shutdown"
   action 5 cli command "exit"
  !
  end
  wr mem
  !


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[[https://netsim-tools.readthedocs.io/en/latest/labs/csr.html]]