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    border_style: ''
    color: '#020202'
    rotation: 0
    text_bold: true
    text_content: |-
      1. Verify RTR4 has reachability to RTR1's Loopback.
      2. Log into RTR4 and advertise its loopback into OSPF. The
      password is the smallest MTU configured along the path.
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nodes:
  - boot_disk_size: null
    configuration:
      - name: ios_config.txt
        content: |-
          Building configuration...


          Current configuration : 3396 bytes
          !
          ! Last configuration change at 01:09:35 UTC Sat Jun 27 2026
          !
          version 15.9
          service timestamps debug datetime msec
          service timestamps log datetime msec
          service password-encryption
          !
          hostname RTR1
          !
          boot-start-marker
          boot-end-marker
          !
          !
          no logging console
          !
          no aaa new-model
          !
          !
          !
          mmi polling-interval 60
          no mmi auto-configure
          no mmi pvc
          mmi snmp-timeout 180
          !
          !
          !
          !
          !
          !
          !
          !
          !
          !
          !
          no ip domain lookup
          ip domain name wittynetworks.net
          ip cef
          no ipv6 cef
          !
          multilink bundle-name authenticated
          !
          !
          !
          !
          username admin privilege 15 password 7 01040F104F12
          !
          redundancy
          !
          !
          !
          !
          !
          !
          !
          !
          !
          !
          !
          !
          !
          !
          !
          interface Loopback0
           ip address 1.1.1.1 255.255.255.255
           ip ospf 1 area 0
          !
          interface Ethernet0/0
           description RTR2
           ip address 12.1.1.1 255.255.255.248
           ip ospf 1 area 0
           duplex auto
           speed auto
           media-type rj45
          !
          interface Ethernet0/1
           description RTR3
           no ip address
           duplex auto
           speed auto
           media-type rj45
          !
          interface Ethernet0/2
           no ip address
           shutdown
           duplex auto
           speed auto
           media-type rj45
          !
          interface Ethernet0/3
           description Admin
           ip address 172.16.1.1 255.255.255.0
           ip ospf 1 area 0
           duplex auto
           speed auto
           media-type rj45
          !
          router ospf 1
          !
          ip forward-protocol nd
          !
          !
          no ip http server
          no ip http secure-server
          !
          ipv6 ioam timestamp
          !
          !
          !
          control-plane
          !
          banner exec ^CC
          **************************************************************************
          * iol-xe is strictly limited to use for evaluation, demonstration and IOS  *
          * education. iol-xe is provided as-is and is not supported by Cisco's      *
          * Technical Advisory Center. Any use or disclosure, in whole or in part, *
          * of the iol-xe Software or Documentation to any third party for any       *
          * purposes is expressly prohibited except as otherwise authorized by     *
          * Cisco in writing.                                                      *
          **************************************************************************^C
          banner incoming ^CC
          **************************************************************************
          * iol-xe is strictly limited to use for evaluation, demonstration and IOS  *
          * education. iol-xe is provided as-is and is not supported by Cisco's      *
          * Technical Advisory Center. Any use or disclosure, in whole or in part, *
          * of the iol-xe Software or Documentation to any third party for any       *
          * purposes is expressly prohibited except as otherwise authorized by     *
          * Cisco in writing.                                                      *
          **************************************************************************^C
          banner login ^CC
          **************************************************************************
          * iol-xe is strictly limited to use for evaluation, demonstration and IOS  *
          * education. iol-xe is provided as-is and is not supported by Cisco's      *
          * Technical Advisory Center. Any use or disclosure, in whole or in part, *
          * of the iol-xe Software or Documentation to any third party for any       *
          * purposes is expressly prohibited except as otherwise authorized by     *
          * Cisco in writing.                                                      *
          **************************************************************************^C
          !
          line con 0
           exec-timeout 0 0
           password 7 060800204F4D0C0A16
           logging synchronous
           login
          line aux 0
          line vty 0 4
           exec-timeout 0 0
           login local
           transport input ssh
          line vty 5 15
           login local
           transport input ssh
          !
          no scheduler allocate
          !
          crypto key gen rsa mod 2048
          end
    cpu_limit: null
    cpus: null
    data_volume: null
    hide_links: false
    id: n0
    image_definition: null
    label: RTR1
    node_definition: iol-xe
    parameters: {}
    ram: null
    tags: []
    x: -334
    y: 5
    interfaces:
      - id: i0
        label: Loopback0
        type: loopback
      - id: i1
        label: Ethernet0/0
        slot: 0
        type: physical
      - id: i2
        label: Ethernet0/1
        slot: 1
        type: physical
      - id: i3
        label: Ethernet0/2
        slot: 2
        type: physical
      - id: i4
        label: Ethernet0/3
        slot: 3
        type: physical
  - boot_disk_size: null
    configuration:
      - name: ios_config.txt
        content: |-
          Building configuration...


          Current configuration : 3485 bytes
          !
          ! Last configuration change at 01:23:56 UTC Sat Jun 27 2026
          !
          version 15.9
          service timestamps debug datetime msec
          service timestamps log datetime msec
          service password-encryption
          !
          hostname RTR3
          !
          boot-start-marker
          boot-end-marker
          !
          !
          no logging console
          !
          no aaa new-model
          !
          !
          !
          mmi polling-interval 60
          no mmi auto-configure
          no mmi pvc
          mmi snmp-timeout 180
          !
          !
          !
          !
          !
          !
          !
          !
          !
          !
          !
          no ip domain lookup
          ip domain name wittynetworks.net
          ip cef
          no ipv6 cef
          !
          multilink bundle-name authenticated
          !
          !
          !
          !
          username admin privilege 15 password 7 061106355857
          !
          redundancy
          !
          !
          !
          !
          !
          !
          !
          !
          !
          !
          !
          !
          !
          !
          !
          interface Loopback0
           ip address 3.3.3.3 255.255.255.255
           ip ospf 1 area 0
          !
          interface Ethernet0/0
           no ip address
           shutdown
           duplex auto
           speed auto
           media-type rj45
          !
          interface Ethernet0/1
           description RTR2
           mtu 1400
           ip address 23.1.1.3 255.255.255.248
           ip ospf 1 area 0
           duplex auto
           speed auto
           media-type rj45
          !
          interface Ethernet0/2
           description RTR4
           ip address 34.1.1.3 255.255.255.248
           ip ospf 1 area 0
           duplex auto
           speed auto
           media-type rj45
          !
          interface Ethernet0/3
           no ip address
           shutdown
           duplex auto
           speed auto
           media-type rj45
          !
          router ospf 1
          !
          ip forward-protocol nd
          !
          !
          no ip http server
          no ip http secure-server
          !
          ip access-list standard VTY
           permit 172.16.1.2
          !
          ipv6 ioam timestamp
          !
          !
          !
          control-plane
          !
          banner exec ^CCC
          **************************************************************************
          * iol-xe is strictly limited to use for evaluation, demonstration and IOS  *
          * education. iol-xe is provided as-is and is not supported by Cisco's      *
          * Technical Advisory Center. Any use or disclosure, in whole or in part, *
          * of the iol-xe Software or Documentation to any third party for any       *
          * purposes is expressly prohibited except as otherwise authorized by     *
          * Cisco in writing.                                                      *
          **************************************************************************^C
          banner incoming ^CCC
          **************************************************************************
          * iol-xe is strictly limited to use for evaluation, demonstration and IOS  *
          * education. iol-xe is provided as-is and is not supported by Cisco's      *
          * Technical Advisory Center. Any use or disclosure, in whole or in part, *
          * of the iol-xe Software or Documentation to any third party for any       *
          * purposes is expressly prohibited except as otherwise authorized by     *
          * Cisco in writing.                                                      *
          **************************************************************************^C
          banner login ^CCC
          **************************************************************************
          * iol-xe is strictly limited to use for evaluation, demonstration and IOS  *
          * education. iol-xe is provided as-is and is not supported by Cisco's      *
          * Technical Advisory Center. Any use or disclosure, in whole or in part, *
          * of the iol-xe Software or Documentation to any third party for any       *
          * purposes is expressly prohibited except as otherwise authorized by     *
          * Cisco in writing.                                                      *
          **************************************************************************^C
          !
          line con 0
           exec-timeout 0 0
           password 7 12170A161108091739
           logging synchronous
           login
          line aux 0
          line vty 0 4
           access-class VTY in
           exec-timeout 0 0
           no login
          line vty 5 15
           access-class VTY in
           no login
          !
          no scheduler allocate
          !
          crypto key gen rsa mod 2048
          end
    cpu_limit: null
    cpus: null
    data_volume: null
    hide_links: false
    id: n1
    image_definition: null
    label: RTR3
    node_definition: iol-xe
    parameters: {}
    ram: null
    tags: []
    x: 21
    y: 7
    interfaces:
      - id: i0
        label: Loopback0
        type: loopback
      - id: i1
        label: Ethernet0/0
        slot: 0
        type: physical
      - id: i2
        label: Ethernet0/1
        slot: 1
        type: physical
      - id: i3
        label: Ethernet0/2
        slot: 2
        type: physical
      - id: i4
        label: Ethernet0/3
        slot: 3
        type: physical
  - boot_disk_size: null
    configuration:
      - name: ios_config.txt
        content: |-
          Building configuration...

          Current configuration : 3210 bytes
          !
          ! Last configuration change at 01:47:51 UTC Sat Jun 27 2026
          !
          version 15.9
          service timestamps debug datetime msec
          service timestamps log datetime msec
          no service password-encryption
          !
          hostname Admin
          !
          boot-start-marker
          boot-end-marker
          !
          !
          no logging console
          !
          no aaa new-model
          !
          !
          !
          mmi polling-interval 60
          no mmi auto-configure
          no mmi pvc
          mmi snmp-timeout 180
          !
          !
          !
          !
          !
          no ip routing
          !
          !
          !
          !
          !
          !
          no ip domain lookup
          ip domain name wittynetworks.net
          no ip cef
          no ipv6 cef
          !
          multilink bundle-name authenticated
          !
          !
          !
          !
          !
          redundancy
          !
          !
          !
          !
          !
          !
          !
          !
          !
          !
          !
          !
          !
          !
          !
          interface Ethernet0/0
           no ip address
           no ip route-cache
           shutdown
           duplex auto
           speed auto
           media-type rj45
          !
          interface Ethernet0/1
           no ip address
           no ip route-cache
           shutdown
           duplex auto
           speed auto
           media-type rj45
          !
          interface Ethernet0/2
           no ip address
           no ip route-cache
           shutdown
           duplex auto
           speed auto
           media-type rj45
          !
          interface Ethernet0/3
           description RTR1
           ip address 172.16.1.2 255.255.255.0
           no ip route-cache
           duplex auto
           speed auto
           media-type rj45
          !
          ip default-gateway 172.16.1.1
          ip forward-protocol nd
          !
          !
          no ip http server
          no ip http secure-server
          !
          ipv6 ioam timestamp
          !
          !
          !
          control-plane
          !
          banner exec ^C
          **************************************************************************
          * iol-xe is strictly limited to use for evaluation, demonstration and IOS  *
          * education. iol-xe is provided as-is and is not supported by Cisco's      *
          * Technical Advisory Center. Any use or disclosure, in whole or in part, *
          * of the iol-xe Software or Documentation to any third party for any       *
          * purposes is expressly prohibited except as otherwise authorized by     *
          * Cisco in writing.                                                      *
          **************************************************************************^C
          banner incoming ^C
          **************************************************************************
          * iol-xe is strictly limited to use for evaluation, demonstration and IOS  *
          * education. iol-xe is provided as-is and is not supported by Cisco's      *
          * Technical Advisory Center. Any use or disclosure, in whole or in part, *
          * of the iol-xe Software or Documentation to any third party for any       *
          * purposes is expressly prohibited except as otherwise authorized by     *
          * Cisco in writing.                                                      *
          **************************************************************************^C
          banner login ^C
          **************************************************************************
          * iol-xe is strictly limited to use for evaluation, demonstration and IOS  *
          * education. iol-xe is provided as-is and is not supported by Cisco's      *
          * Technical Advisory Center. Any use or disclosure, in whole or in part, *
          * of the iol-xe Software or Documentation to any third party for any       *
          * purposes is expressly prohibited except as otherwise authorized by     *
          * Cisco in writing.                                                      *
          **************************************************************************^C
          !
          line con 0
           exec-timeout 0 0
           logging synchronous
          line aux 0
          line vty 0 4
           exec-timeout 0 0
           login
           transport input none
          !
          no scheduler allocate
          !
          end
    cpu_limit: null
    cpus: null
    data_volume: null
    hide_links: false
    id: n2
    image_definition: null
    label: Admin
    node_definition: iol-xe
    parameters: {}
    ram: null
    tags: []
    x: -440
    y: -116
    interfaces:
      - id: i0
        label: Loopback0
        type: loopback
      - id: i1
        label: Ethernet0/0
        slot: 0
        type: physical
      - id: i2
        label: Ethernet0/1
        slot: 1
        type: physical
      - id: i3
        label: Ethernet0/2
        slot: 2
        type: physical
      - id: i4
        label: Ethernet0/3
        slot: 3
        type: physical
  - boot_disk_size: null
    configuration:
      - name: ios_config.txt
        content: |-
          Building configuration...


          Current configuration : 3882 bytes
          !
          ! Last configuration change at 01:24:31 UTC Sat Jun 27 2026
          !
          version 15.9
          service timestamps debug datetime msec
          service timestamps log datetime msec
          service password-encryption
          !
          hostname RTR4
          !
          boot-start-marker
          boot-end-marker
          !
          !
          no logging console
          !
          no aaa new-model
          !
          !
          !
          mmi polling-interval 60
          no mmi auto-configure
          no mmi pvc
          mmi snmp-timeout 180
          !
          !
          !
          !
          !
          !
          !
          !
          !
          !
          !
          no ip domain lookup
          ip domain name wittynetworks.net
          ip cef
          no ipv6 cef
          !
          multilink bundle-name authenticated
          !
          !
          !
          !
          username admin privilege 15 password 7 00131A121042
          !
          redundancy
          !
          !
          !
          !
          !
          !
          !
          !
          !
          !
          !
          !
          !
          !
          !
          interface Ethernet0/0
           no ip address
           shutdown
           duplex auto
           speed auto
           media-type rj45
          !
          interface Ethernet0/1
           no ip address
           shutdown
           duplex auto
           speed auto
           media-type rj45
          !
          interface Ethernet0/2
           description RTR3
           ip address 34.1.1.4 255.255.255.248
           ip access-group PING-TRIGGER in
           ip ospf 1 area 0
           duplex auto
           speed auto
           media-type rj45
          !
          interface Ethernet0/3
           no ip address
           shutdown
           duplex auto
           speed auto
           media-type rj45
          !
          interface lo0
            ip address 4.4.4.4 255.255.255.255
          !
          router ospf 1
          !
          ip forward-protocol nd
          !
          !
          no ip http server
          no ip http secure-server
          !
          ip access-list standard VTY
           permit 172.16.1.2
          !
          ip access-list extended PING-TRIGGER
           permit icmp host 1.1.1.1 any echo log
           permit ip any any
          !
          ipv6 ioam timestamp
          !
          !
          !
          control-plane
          !
          banner exec ^CCC
          **************************************************************************
          * iol-xe is strictly limited to use for evaluation, demonstration and IOS  *
          * education. iol-xe is provided as-is and is not supported by Cisco's      *
          * Technical Advisory Center. Any use or disclosure, in whole or in part, *
          * of the iol-xe Software or Documentation to any third party for any       *
          * purposes is expressly prohibited except as otherwise authorized by     *
          * Cisco in writing.                                                      *
          **************************************************************************^C
          banner incoming ^CCC
          **************************************************************************
          * iol-xe is strictly limited to use for evaluation, demonstration and IOS  *
          * education. iol-xe is provided as-is and is not supported by Cisco's      *
          * Technical Advisory Center. Any use or disclosure, in whole or in part, *
          * of the iol-xe Software or Documentation to any third party for any       *
          * purposes is expressly prohibited except as otherwise authorized by     *
          * Cisco in writing.                                                      *
          **************************************************************************^C
          banner login ^CCC
          **************************************************************************
          * iol-xe is strictly limited to use for evaluation, demonstration and IOS  *
          * education. iol-xe is provided as-is and is not supported by Cisco's      *
          * Technical Advisory Center. Any use or disclosure, in whole or in part, *
          * of the iol-xe Software or Documentation to any third party for any       *
          * purposes is expressly prohibited except as otherwise authorized by     *
          * Cisco in writing.                                                      *
          **************************************************************************^C
          !
          line con 0
           exec-timeout 0 0
           password 7 060800204F4D0C0A16
           logging synchronous
           login
          line aux 0
          line vty 0 4
           access-class VTY in
           exec-timeout 0 0
           no login
           transport input ssh
          line vty 5 15
           access-class VTY in
           no login
           transport input ssh
          !
          no scheduler allocate
          event manager applet ENABLE_VTY_LOGIN_LOCAL
           event syslog pattern "IPACCESSLOGDP: list PING-TRIGGER permitted icmp 1.1.1.1 -> 34.1.1.4"
           action 1.0 cli command "enable"
           action 2.0 cli command "configure terminal"
           action 3.0 cli command "line vty 0 15"
           action 4.0 cli command "login local"
           action 5.0 cli command "end"
           action 6.0 syslog msg "VTY login local enabled after ping trigger from 1.1.1.1"
          !
          crypto key gen rsa mod 2048
          end
    cpu_limit: null
    cpus: null
    data_volume: null
    hide_links: false
    id: n3
    image_definition: null
    label: RTR4
    node_definition: iol-xe
    parameters: {}
    ram: null
    tags: []
    x: 192
    y: 7
    interfaces:
      - id: i0
        label: Loopback0
        type: loopback
      - id: i1
        label: Ethernet0/0
        slot: 0
        type: physical
      - id: i2
        label: Ethernet0/1
        slot: 1
        type: physical
      - id: i3
        label: Ethernet0/2
        slot: 2
        type: physical
      - id: i4
        label: Ethernet0/3
        slot: 3
        type: physical
  - boot_disk_size: null
    configuration:
      - name: ios_config.txt
        content: |-
          Building configuration...


          Current configuration : 3485 bytes
          !
          ! Last configuration change at 01:23:52 UTC Sat Jun 27 2026
          !
          version 15.9
          service timestamps debug datetime msec
          service timestamps log datetime msec
          service password-encryption
          !
          hostname RTR2
          !
          boot-start-marker
          boot-end-marker
          !
          !
          no logging console
          !
          no aaa new-model
          !
          !
          !
          mmi polling-interval 60
          no mmi auto-configure
          no mmi pvc
          mmi snmp-timeout 180
          !
          !
          !
          !
          !
          !
          !
          !
          !
          !
          !
          no ip domain lookup
          ip domain name wittynetworks.net
          ip cef
          no ipv6 cef
          !
          multilink bundle-name authenticated
          !
          !
          !
          !
          username admin privilege 15 password 7 0836455A1D00
          !
          redundancy
          !
          !
          !
          !
          !
          !
          !
          !
          !
          !
          !
          !
          !
          !
          !
          interface Loopback2
           ip address 2.2.2.2 255.255.255.255
           ip ospf 1 area 0
          !
          interface Ethernet0/0
           description RTR1
           ip address 12.1.1.2 255.255.255.248
           ip ospf 1 area 0
           duplex auto
           speed auto
           media-type rj45
          !
          interface Ethernet0/1
           description RTR3
           mtu 1400
           ip address 23.1.1.2 255.255.255.248
           ip ospf 1 area 0
           duplex auto
           speed auto
           media-type rj45
          !
          interface Ethernet0/2
           no ip address
           shutdown
           duplex auto
           speed auto
           media-type rj45
          !
          interface Ethernet0/3
           no ip address
           shutdown
           duplex auto
           speed auto
           media-type rj45
          !
          router ospf 1
          !
          ip forward-protocol nd
          !
          !
          no ip http server
          no ip http secure-server
          !
          ip access-list standard VTY
           permit 172.16.1.2
          !
          ipv6 ioam timestamp
          !
          !
          !
          control-plane
          !
          banner exec ^CCC
          **************************************************************************
          * iol-xe is strictly limited to use for evaluation, demonstration and IOS  *
          * education. iol-xe is provided as-is and is not supported by Cisco's      *
          * Technical Advisory Center. Any use or disclosure, in whole or in part, *
          * of the iol-xe Software or Documentation to any third party for any       *
          * purposes is expressly prohibited except as otherwise authorized by     *
          * Cisco in writing.                                                      *
          **************************************************************************^C
          banner incoming ^CCC
          **************************************************************************
          * iol-xe is strictly limited to use for evaluation, demonstration and IOS  *
          * education. iol-xe is provided as-is and is not supported by Cisco's      *
          * Technical Advisory Center. Any use or disclosure, in whole or in part, *
          * of the iol-xe Software or Documentation to any third party for any       *
          * purposes is expressly prohibited except as otherwise authorized by     *
          * Cisco in writing.                                                      *
          **************************************************************************^C
          banner login ^CCC
          **************************************************************************
          * iol-xe is strictly limited to use for evaluation, demonstration and IOS  *
          * education. iol-xe is provided as-is and is not supported by Cisco's      *
          * Technical Advisory Center. Any use or disclosure, in whole or in part, *
          * of the iol-xe Software or Documentation to any third party for any       *
          * purposes is expressly prohibited except as otherwise authorized by     *
          * Cisco in writing.                                                      *
          **************************************************************************^C
          !
          line con 0
           exec-timeout 0 0
           password 7 14191D0A0F072F3837
           logging synchronous
           login
          line aux 0
          line vty 0 4
           access-class VTY in
           exec-timeout 0 0
           no login
          line vty 5 15
           access-class VTY in
           no login
          !
          no scheduler allocate
          !
          crypto key gen rsa mod 2048
          end
    cpu_limit: null
    cpus: null
    data_volume: null
    hide_links: false
    id: n4
    image_definition: null
    label: RTR2
    node_definition: iol-xe
    parameters: {}
    ram: null
    tags: []
    x: -149
    y: 10
    interfaces:
      - id: i0
        label: Loopback0
        type: loopback
      - id: i1
        label: Ethernet0/0
        slot: 0
        type: physical
      - id: i2
        label: Ethernet0/1
        slot: 1
        type: physical
      - id: i3
        label: Ethernet0/2
        slot: 2
        type: physical
      - id: i4
        label: Ethernet0/3
        slot: 3
        type: physical
links:
  - id: l0
    n1: n0
    n2: n4
    i1: i1
    i2: i1
    conditioning: {}
    label: iol-xe-0-Ethernet0/0<->iol-xe-4-Ethernet0/0
  - id: l1
    n1: n4
    n2: n1
    i1: i2
    i2: i2
    conditioning: {}
    label: iol-xe-4-Ethernet0/1<->iol-xe-1-Ethernet0/1
  - id: l2
    n1: n1
    n2: n3
    i1: i3
    i2: i3
    conditioning: {}
    label: iol-xe-1-Ethernet0/2<->iol-xe-3-Ethernet0/2
  - id: l3
    n1: n2
    n2: n0
    i1: i4
    i2: i4
    conditioning: {}
    label: iol-xe-2-Ethernet0/3<->RTR1-Ethernet0/3
lab:
  description: ''
  notes: |-
    1. Verify RTR4 has reachability to RTR1's Loopback.  You will be able to access RTR4
    once you do.
    2. The password to login is the value of the lowest MTU on the path.
       Example:  1500 MTU means the login password is 1500.
  title: BRIDGE TROLL
  version: 0.2.2
