Lab 8.5.1 – Troubleshooting Enterprise Networks 1 (Answers)

Lab 8.5.1 – Troubleshooting Enterprise Networks 1 (Answers)

Topology Diagram

Addressing Table

Learning Objectives

Upon completion of this lab, you will be able to:

• Cable a network according to the topology diagram
• Erase the startup configuration and reload a router to the default state
• Load the routers and switches with supplied scripts
• Find and correct all network errors
• Document the corrected network

Scenario

You have been asked to correct configuration errors in the company network. For this lab, do not use login or password protection on any console lines to prevent accidental lockout. Use ciscoccna for all passwords in this scenario.

Note: Because this lab is cumulative, you will be using all the knowledge and troubleshooting techniques that you have acquired from the previous material to successfully complete this lab.

Requirements

• S2 is the spanning-tree root for VLAN 11, and S3 is the spanning-tree root for VLAN 30.
• S3 is a VTP server with S2 as a client.
• The serial link between R1 and R2 is Frame Relay. Make sure that each router can ping their own Frame Relay interface.
• The serial link between R2 and R3 uses HDLC encapsulation.
• The serial link between R1 and R3 uses PPP.
• The serial link between R1 and R3 is authenticated using CHAP.
• R2 must have secure login procedures because it is the Internet edge router.
• All vty lines, except those belonging to R2, allow connections only from the subnets shown in the topology diagram, excluding the public address.

Hint:

R2# telnet 10.1.1.1 /source-interface loopback 0
Trying 10.1.1.1 …
% Connection refused by remote host

• Source IP address spoofing should be prevented on all links that do not connect to other routers.
• Routing protocols must be secured. All RIP routers must use MD5 authentication.
• R3 must not be able to telnet to R2 through the directly connected serial link.
• R3 has access to both VLAN 11 and 30 via its Fast Ethernet port 0/0.
• The TFTP server should not get any traffic that has a source address outside the subnet. All devices have access to the TFTP server.
• All devices on the 192.168.10.0 subnet must be able to get their IP addresses from DHCP on R1. This includes S1.
• R1 must be accessible via SDM.
• All addresses shown in the diagram must be reachable from every device.

Instructor Notes

Students are provided with the configurations to load into the routers. The configurations in the student lab do not contain the lines in red. As the instructor, these lines are provided here for you so that you can guide students through the troubleshooting process.

The lab as presented here provides troubleshooting and problem solving practice and confirmation for many of the skills presented throughout the CCNA courses. An alternate starting configuration is available for a less extensive lab. The alternate configuration has fewer troubleshooting points and allows students to complete the lab in a shorter time frame.

Task 1: Load Routers with the Supplied Scripts

!------------------------------------------
! R1
!------------------------------------------
no service password-encryption
!
hostname R1
!
boot-start-marker
boot-end-marker
!
security passwords min-length 6
enable secret 5 ciscoccna
!
ip cef
!
ip dhcp pool Access1
network 192.168.10.0 255.255.255.0
default-router 192.168.10.1
!
no ip domain lookup
frame-relay switching
!The Frame Relay link does not work unless one side is switching frames
!
key chain RIP_KEY
key 1
key-string cisco
!Must create a key chain to be used for RIP authentication to work.
!
username R3 password 0 ciscoccna
username ccna password 0 ciscoccna
!
interface FastEthernet0/0
ip address 192.168.10.1 255.255.255.0
ip rip authentication mode md5
ip rip authentication key-chain RIP_KEY
no shutdown
!
interface FastEthernet0/1
ip address 192.168.11.1 255.255.255.0
ip rip authentication mode md5
ip rip authentication key-chain RIP_KEY
no shutdown
!
interface Serial0/0/0
ip address 10.1.1.1 255.255.255.252
ip rip authentication mode md5
ip rip authentication key-chain RIP_KEY
encapsulation frame-relay
clockrate 128000
frame-relay map ip 10.1.1.1 201
frame-relay map ip 10.1.1.2 201 broadcast
no frame-relay inverse-arp
no shutdown
frame-relay intf-type dce
! The router acting as the Frame Relay switch must have its serial
! interface designated on the DCE side of the connection.
!
interface Serial0/0/1
ip address 10.3.3.1 255.255.255.252
ip rip authentication mode md5
ip rip authentication key-chain RIP_KEY
encapsulation ppp
ppp authentication chap
no shutdown
!
!
router rip
version 2
passive-interface default
no passive-interface FastEthernet0/0
no passive-interface FastEthernet0/1
no passive-interface Serial0/0/0
no passive-interface Serial0/0/1
! Interfaces must be put into a non-passive state to propagate RIP
! Updates when the passive interface default command is entered.
network 10.1.1.0
network 10.0.0.0
! The network 10.1.1.0 command will actually work. However, RIP will
! change it to 10.0.0.0. Issue the show run command to confirm this.
network 192.168.10.0
network 192.168.11.0
no auto-summary
!
ip classless
!
no ip http server
ip http server
! The HTTP server was most likely disabled for security reasons.
! However, for SDM to be accessible, the HTTP server must be enabled.
!
ip access-list standard Anti-spoofing
permit 192.168.10.0 0.0.0.255
deny any
ip access-list standard VTY
permit 10.0.0.0 0.255.255.255
permit 192.168.10.0 0.0.0.255
permit 192.168.11.0 0.0.0.255
permit 192.168.20.0 0.0.0.255
permit 192.168.30.0 0.0.0.255
!
line con 0
exec-timeout 0 0
logging synchronous
line aux 0
line vty 0 4
access-class VTY in
login local
!
end
!------------------------------------------
! R2
!------------------------------------------
no service password-encryption
!
hostname R2
!
security passwords min-length 6
enable secret ciscoccna
!
aaa new-model
!
aaa authentication login LOCAL_AUTH local
aaa authentication login local_auth local
! The authentication list name is case-sensitive, therefore vty lines
! try to authenticate against a list that does not exist. Case and
! spelling errors are among the most common.
aaa session-id common
!
ip cef
!
no ip domain lookup
!
key chain RIP_KEY
key 1
key-string cisco
username ccna password 0 ciscoccna
!
interface Loopback0
description Simulated ISP Connection
ip address 209.165.200.245 255.255.255.224
!
interface FastEthernet0/0
no ip address
shutdown
duplex auto
speed auto
!
interface FastEthernet0/1
ip address 192.168.20.1 255.255.255.0
ip access-group TFTP out
ip access-group Anti-spoofing in
ip nat outside
duplex auto
speed auto
!
!
interface Serial0/0/0
ip address 10.1.1.2 255.255.255.0
ip address 10.1.1.2 255.255.255.252
ip nat inside
encapsulation frame-relay
no keepalive
frame-relay map ip 10.1.1.1 201 broadcast
frame-relay map ip 10.1.1.2 201
! Without this command, this router will not be able to ping its own
! interface
no frame-relay inverse-arp
!
interface Serial0/0/1
ip address 10.2.2.1 255.255.255.0
ip address 10.2.2.1 255.255.255.252
! After using the /24 subnet so frequently, subnet masks are easily
! mistyped.
ip access-group R3-telnet in
ip nat inside
ip rip authentication mode md5
ip rip authentication key-chain RIP_KEY
clockrate 128000
!
!
router rip
version 2
passive-interface default
no passive-interface Serial0/0/0
no passive-interface Serial0/0/1
network 10.0.0.0
network 192.168.20.0
default-information originate
no auto-summary
!
ip classless
ip route 0.0.0.0 0.0.0.0 209.165.200.226
!
no ip http server
ip nat inside source list NAT interface FastEthernet0/0 overload
!
ip access-list standard Anti-spoofing
permit 192.168.20.0 0.0.0.255
deny any
ip access-list standard NAT
permit 10.0.0.0 0.255.255.255
permit 192.168.0.0 0.0.255.255
!
ip access-list extended R3-telnet
deny tcp host 10.2.2.2 host 10.2.2.1 eq telnet
deny tcp host 10.3.3.2 host 10.2.2.1 eq telnet
deny tcp host 192.168.11.3 host 10.2.2.1 eq telnet
deny tcp host 192.168.30.1 host 10.2.2.1 eq telnet
permit ip any any
!
ip access-list standard TFTP
permit 192.168.20.0 0.0.0.255
!
control-plane
!
line con 0
exec-timeout 0 0
logging synchronous
line aux 0
exec-timeout 15 0
logging synchronous
login authentication local_auth
transport output telnet
line vty 0 4
exec-timeout 15 0
logging synchronous
login authentication local_auth
transport input telnet
!
end
!------------------------------------------
! R3
!------------------------------------------
no service password-encryption
!
hostname R3
!
security passwords min-length 6
enable secret ciscoccna
!
no aaa new-model
!
ip cef
!
no ip domain lookup
!
key chain RIP_KEY
key 1
key-string cisco
username R1 password 0 ciscoccna
username ccna password 0 ciscoccna
!
interface FastEthernet0/1
no shutdown
!
interface FastEthernet0/1.11
encapsulation dot1Q 11
ip address 192.168.11.3 255.255.255.0
ip rip authentication mode md5
ip rip authentication key-chain RIP_KEY
no snmp trap link-status
!
interface FastEthernet0/1.30
encapsulation dot1Q 30
ip address 192.168.30.1 255.255.255.0
ip rip authentication mode md5
ip rip authentication key-chain RIP_KEY
ip access-group Anti-spoofing in
no snmp trap link-status
!
!
interface Serial0/0/0
ip address 10.3.3.2 255.255.255.252
ip rip authentication mode md5
ip rip authentication key-chain RIP_KEY
encapsulation ppp
clockrate 125000
ppp authentication chap
!
interface Serial0/0/1
ip address 10.2.2.2 255.255.255.252
ip rip authentication mode md5
ip rip authentication key-chain RIP_KEY
! All of the other routers are using authentication. Therefore, without
! this command on each interface that sends RIP updates, this router
! will not be able to participate in RIP.
!
router rip
version 2
passive-interface default
no passive-interface FastEthernet0/1.11
no passive-interface FastEthernet0/1.30
no passive-interface Serial0/0/0
no passive-interface Serial0/0/1
network 10.0.0.0
network 192.168.11.0
network 192.168.30.0
no auto-summary
!
ip classless
!
ip http server
!
ip access-list standard Anti-spoofing
permit 192.168.30.0 0.0.0.255
deny any
ip access-list standard VTY
permit 10.0.0.0 0.255.255.255
permit 192.168.10.0 0.0.0.255
permit 192.168.11.0 0.0.0.255
permit 192.168.20.0 0.0.0.255
permit 192.168.30.0 0.0.0.255
!
control-plane
!
line con 0
exec-timeout 0 0
 logging synchronous
line aux 0
exec-timeout 15 0
logging synchronous
line vty 0 4
access-class VTY in
exec-timeout 15 0
logging synchronous
login local
!
end
!-----------------------------------------
! S1
!-----------------------------------------
no service password-encryption
!
hostname S1
!
security passwords min-length 6
enable secret ciscoccna
!
no aaa new-model
vtp domain CCNA_Troubleshooting
vtp mode transparent
vtp password ciscoccna
ip subnet-zero
!
no ip domain-lookup
!
no file verify auto
spanning-tree mode pvst
spanning-tree extend system-id
!
vlan internal allocation policy ascending
!
vlan 10
!
interface FastEthernet0/1
switchport access vlan 10
switchport mode access
!
interface FastEthernet0/2
switchport access vlan 10
switchport mode access
!
interface range FastEthernet0/3-24
!
interface GigabitEthernet0/1
shutdown
!
interface GigabitEthernet0/2
shutdown
!
interface Vlan1
no ip address
no ip route-cache
!
interface Vlan10
ip address dhcp
no ip route-cache
!
ip default-gateway 192.168.10.1
ip http server
!
control-plane
!
line con 0
exec-timeout 0 0
logging synchronous
line vty 0 4
password ciscoccna
login
line vty 5 15
no login
!
end
!-----------------------------------------
! S2
!-----------------------------------------
no service password-encryption
!
hostname S2
!
security passwords min-length 6
enable secret ciscoccna
!
no aaa new-model
vtp domain CCNA_Troubleshooting
vtp mode transparent
vtp mode client
! NOTE: Because the server was already configured, the VLAN information
! will not be passed to Switch3 until there is a new revision. This can
! be caused by creating and then deleting a VLAN on Switch2, the VTP
! server.
vtp password ciscoccna
ip subnet-zero
!
no ip domain-lookup
!
no file verify auto
!
spanning-tree mode rapid-pvst
spanning-tree extend system-id
spanning-tree vlan 11 priority 24576
spanning-tree vlan 30 priority 28672
!
vlan internal allocation policy ascending
!
interface FastEthernet0/1
switchport access vlan 11
switchport mode access
!
interface FastEthernet0/2
switchport access vlan 11
switchport mode access
!
interface FastEthernet0/3
switchport trunk native vlan 99
switchport trunk allowed vlan 11,30
switchport mode trunk
!
interface FastEthernet0/4
switchport trunk native vlan 99
switchport trunk allowed vlan 11,30
switchport mode trunk
!
interface range FastEthernet0/5-24
shutdown
!
interface GigabitEthernet0/1
shutdown
!
interface GigabitEthernet0/2
shutdown
!
interface Vlan1
no ip address
no ip route-cache
!
interface Vlan11
ip address 192.168.11.2 255.255.255.0
no ip route-cache
!
ip http server
!
control-plane
!
line con 0
exec-timeout 0 0
logging synchronous
line vty 0 4
password ciscoccna
login
line vty 5 15
no login
!
end
!-----------------------------------------
! S3
!-----------------------------------------
no service password-encryption
!
hostname S3
!
security passwords min-length 6
enable secret ciscoccna
!
no aaa new-model
vtp domain CCNA_troubleshooting
vtp domain CCNA_Troubleshooting
! The VTP mode is case-sensitive, so a typo like this will prevent VTP
! from working properly. The switch should display an error about a
! domain mismatch when the trunk links come up.
vtp mode server
vtp password ciscoccna
ip subnet-zero
!
no ip domain-lookup
!
no file verify auto
!
spanning-tree mode rapid-pvst
spanning-tree extend system-id
spanning-tree vlan 11 priority 28672
spanning-tree vlan 30 priority 24576
!
vlan internal allocation policy ascending
!
vlan 11,30
! It is a common mistake to forget to create VLANs, especially if they
! are already allowed on trunk links.
!
interface FastEthernet0/1
switchport trunk allowed vlan 30
switchport trunk allowed vlan 11,30
! VLAN 11 must be allowed on the trunk to R3 to obtain connectivity to
! R2
 switchport mode trunk
!
interface FastEthernet0/2
switchport access vlan 30
switchport mode access
!
interface FastEthernet0/3
switchport trunk native vlan 99
switchport trunk allowed vlan 11,30
switchport mode trunk
!
interface FastEthernet0/4
switchport trunk native vlan 99
switchport trunk allowed vlan 11,30
switchport mode trunk
!
interface range FastEthernet0/5-24
shutdown
!
interface GigabitEthernet0/1
shutdown
!
interface GigabitEthernet0/2
shutdown
!
interface Vlan1
no ip address
 no ip route-cache
!
interface Vlan30
ip address 192.168.30.2 255.255.255.0
no ip route-cache
!
ip default-gateway 192.168.30.1
ip http server
!
control-plane
!
line con 0
exec-timeout 5 0
logging synchronous
line vty 0 4
password ciscoccna
login
line vty 5 15
no login
!
end

Task 2: Find and Correct All Network Errors

Task 3: Verify that Requirements Are Fully Met

Because time constraints prevent troubleshooting a problem on each topic, only a select number of topics have problems. However, to reinforce and strengthen troubleshooting skills, you should verify that each requirement is met. To do this, present an example of each requirement (for example a show or debug command).

Remind students of the many commands they have used throughout this course and others to verify and troubleshoot. Some common and useful commands include:

• show ip route
• show ip interface brief
• show spanning-tree
• show vtp status
• show interface serial
• debug ppp authentication
• show ip access-lists
• show ip dhcp binding
• show frame-relay map
• show run
• debug ppp authentication
• ping
• telnet

This task is intentionally left vague because there are many ways to verify the requirements. Below is an example for requirement 1.

Requirement 1 states that S2 should be the root for VLAN 11 and that S3 should be the root for VLAN 30. Issuing the show spanning-tree command allows us to confirm that these switches have been configured correctly.

S2#show spanning-tree
VLAN0011
Spanning tree enabled protocol rstp
Root ID    Priority    24587
           Address     001c.57ec.2480
           This bridge is the root
           Hello Time   2 sec  Max Age 20 sec  Forward Delay 15

Bridge ID  Priority    24587  (priority 24576 sys-id-ext 11)
           Address     001c.57ec.2480
           Hello Time   2 sec  Max Age 20 sec  Forward Delay 15
           Aging Time 300

Interface        Role Sts Cost      Prio.Nbr Type
---------------- ---- --- --------- -------- ---------------------
Fa0/2            Desg FWD 19        128.2    P2p
Fa0/3            Desg FWD 19        128.3    P2p
Fa0/4            Desg FWD 19        128.4    P2p

VLAN0030
  Spanning tree enabled protocol rstp
  Root ID    Priority    24606
             Address     001c.57ec.1480
             Cost        19
             Port        3 (FastEthernet0/3)
             Hello Time   2 sec  Max Age 20 sec  Forward Delay 15

  Bridge ID  Priority    28702  (priority 28672 sys-id-ext 30)
             Address     001c.57ec.2480
             Hello Time   2 sec  Max Age 20 sec  Forward Delay 15
             Aging Time  300

Interface        Role Sts Cost      Prio.Nbr Type
---------------- ---- --- --------- -------- ---------------------
Fa0/3            Root FWD 19        128.3    P2p
Fa0/4            Altn BLK 19        128.4    P2p

Task 4: Document the Corrected Network

!------------------------------------------
! R1
!------------------------------------------
no service password-encryption
!
hostname R1
!
boot-start-marker
boot-end-marker
!
security passwords min-length 6
enable secret 5 ciscoccna
!
ip cef
!
ip dhcp pool Access1
network 192.168.10.0 255.255.255.0
default-router 192.168.10.1
!
no ip domain lookup
frame-relay switching
!
key chain RIP_KEY
key 1
key-string cisco
username R3 password 0 ciscoccna
username ccna password 0 ciscoccna
!
interface FastEthernet0/0
ip address 192.168.10.1 255.255.255.0
ip rip authentication mode md5
ip rip authentication key-chain RIP_KEY
duplex auto
speed auto
!
interface FastEthernet0/1
ip address 192.168.11.1 255.255.255.0
ip rip authentication mode md5
ip rip authentication key-chain RIP_KEY
duplex auto
speed auto
!
interface Serial0/0/0
ip address 10.1.1.1 255.255.255.252
ip rip authentication mode md5
ip rip authentication key-chain RIP_KEY
encapsulation frame-relay
no keepalive
clockrate 128000
frame-relay map ip 10.1.1.1 201
frame-relay map ip 10.1.1.2 201 broadcast
no frame-relay inverse-arp
frame-relay intf-type dce
!
interface Serial0/0/1
ip address 10.3.3.1 255.255.255.252
ip rip authentication mode md5
ip rip authentication key-chain RIP_KEY
encapsulation ppp
ppp authentication chap
!
!
router rip
version 2
passive-interface default
no passive-interface FastEthernet0/0
no passive-interface FastEthernet0/1
no passive-interface Serial0/0/0
 no passive-interface Serial0/0/1
network 10.0.0.0
network 192.168.10.0
network 192.168.11.0
no auto-summary
!
ip classless
!
ip http server
!
ip access-list standard Anti-spoofing
permit 192.168.10.0 0.0.0.255
deny any
ip access-list standard VTY
permit 10.0.0.0 0.255.255.255
permit 192.168.10.0 0.0.0.255
permit 192.168.11.0 0.0.0.255
permit 192.168.20.0 0.0.0.255
permit 192.168.30.0 0.0.0.255
!
line con 0
exec-timeout 5 0
logging synchronous
line aux 0
line vty 0 4
access-class VTY in
login local
!
end
!------------------------------------------
! R2
!------------------------------------------
no service password-encryption
!
hostname R2
!
security passwords min-length 6
enable secret ciscoccna
!
aaa new-model
!
aaa authentication login local_auth local
aaa session-id common
!
ip cef
!
no ip domain lookup
!
!
key chain RIP_KEY
key 1
key-string cisco
username ccna password 0 ciscoccna
!
interface Loopback0
ip address 209.165.200.245 255.255.255.224
!
interface FastEthernet0/1
ip address 192.168.20.1 255.255.255.0
ip access-group TFTP out
ip access-group Anti-spoofing in
ip nat outside
duplex auto
speed auto
!
interface FastEthernet0/0
no ip address
shutdown
duplex auto
speed auto
!
interface Serial0/0/0
ip address 10.1.1.2 255.255.255.252
ip nat inside
encapsulation frame-relay
no keepalive
frame-relay map ip 10.1.1.1 201 broadcast
frame-relay map ip 10.1.1.2 201
no frame-relay inverse-arp
!
interface Serial0/0/1
ip address 10.2.2.1 255.255.255.252
ip access-group R3-telnet in
ip nat inside
ip rip authentication mode md5
ip rip authentication key-chain RIP_KEY
clockrate 128000
!
!
router rip
version 2
passive-interface default
no passive-interface FastEthernet0/1
no passive-interface Serial0/0/0
no passive-interface Serial0/0/1
network 10.0.0.0
network 192.168.20.0
default-information originate
no auto-summary
!
ip classless
ip route 0.0.0.0 0.0.0.0 209.165.200.226
!
no ip http server
ip nat inside source list NAT interface FastEthernet0/0 overload
!
ip access-list standard Anti-spoofing
permit 192.168.20.0 0.0.0.255
deny any
ip access-list standard NAT
permit 10.0.0.0 0.255.255.255
permit 192.168.0.0 0.0.255.255
!
ip access-list extended R3-telnet
deny tcp host 10.2.2.2 host 10.2.2.1 eq telnet
deny tcp host 10.3.3.2 host 10.2.2.1 eq telnet
deny tcp host 192.168.11.3 host 10.2.2.1 eq telnet
deny tcp host 192.168.30.1 host 10.2.2.1 eq telnet
permit ip any any
!
ip access-list standard TFTP
permit 192.168.20.0 0.0.0.255
!
control-plane
!
line con 0
exec-timeout 5 0
logging synchronous
line aux 0
exec-timeout 15 0
logging synchronous
login authentication local_auth
transport output telnet
line vty 0 4
exec-timeout 15 0
logging synchronous
login authentication local_auth
transport input telnet
!
end
!------------------------------------------
! R3
!------------------------------------------
no service password-encryption
!
hostname R3
!
security passwords min-length 6
enable secret ciscoccna
!
no aaa new-model
!
ip cef
!
no ip domain lookup
!
!
key chain RIP_KEY
key 1
key-string cisco
username R1 password 0 ciscoccna
username ccna password 0 ciscoccna
!
interface FastEthernet0/1
no ip address
duplex auto
speed auto
!
interface FastEthernet0/1.11
encapsulation dot1Q 11
ip address 192.168.11.3 255.255.255.0
ip rip authentication mode md5
ip rip authentication key-chain RIP_KEY
no snmp trap link-status
!
interface FastEthernet0/1.30
encapsulation dot1Q 30
ip address 192.168.30.1 255.255.255.0
ip rip authentication mode md5
ip rip authentication key-chain RIP_KEY
ip access-group Anti-spoofing in
no snmp trap link-status
!
!
interface Serial0/0/0
ip address 10.3.3.2 255.255.255.252
ip rip authentication mode md5
ip rip authentication key-chain RIP_KEY
encapsulation ppp
clockrate 125000
ppp authentication chap
!
interface Serial0/0/1
ip address 10.2.2.2 255.255.255.252
ip rip authentication mode md5
ip rip authentication key-chain RIP_KEY
!
router rip
version 2
passive-interface default
no passive-interface FastEthernet0/1.11
no passive-interface FastEthernet0/1.30
no passive-interface Serial0/0/0
no passive-interface Serial0/0/1
network 10.0.0.0
network 192.168.11.0
network 192.168.30.0
no auto-summary
!
ip classless
!
ip http server
!
ip access-list standard Anti-spoofing
permit 192.168.30.0 0.0.0.255
deny any
ip access-list standard VTY
permit 10.0.0.0 0.255.255.255
permit 192.168.10.0 0.0.0.255
permit 192.168.11.0 0.0.0.255
permit 192.168.20.0 0.0.0.255
permit 192.168.30.0 0.0.0.255
!
control-plane
!
line con 0
exec-timeout 5 0
logging synchronous
line aux 0
exec-timeout 15 0
logging synchronous
line vty 0 4
access-class VTY in
exec-timeout 15 0
logging synchronous
login local
!
end
!-----------------------------------------
! S1
!-----------------------------------------
no service password-encryption
!
hostname S1
!
security passwords min-length 6
enable secret ciscoccna
!
no aaa new-model
vtp domain CCNA_Troubleshooting
vtp mode transparent
vtp password ciscoccna
ip subnet-zero
!
no ip domain-lookup
!
no file verify auto
spanning-tree mode pvst
spanning-tree extend system-id
!
vlan internal allocation policy ascending
!
vlan 10
!
interface FastEthernet0/1
switchport access vlan 10
switchport mode access
!
interface FastEthernet0/2
switchport access vlan 10
switchport mode access
!
interface range FastEthernet0/3-24
!
interface GigabitEthernet0/1
shutdown
!
interface GigabitEthernet0/2
shutdown
!
interface Vlan1
no ip address
no ip route-cache
!
interface Vlan10
ip address dhcp
no ip route-cache
!
ip default-gateway 192.168.10.1
ip http server
!
control-plane
!
!
line con 0
exec-timeout 5 0
logging synchronous
line vty 0 4
password ciscoccna
login
line vty 5 15
no login
!
end
!-----------------------------------------
! S2
!-----------------------------------------
no service pad
service timestamps debug uptime
service timestamps log uptime
no service password-encryption
!
hostname S2
!
security passwords min-length 6
enable secret ciscoccna
!
no aaa new-model
vtp domain CCNA_Troubleshooting
vtp mode client
vtp password ciscoccna
ip subnet-zero
!
no ip domain-lookup
!
no file verify auto
!
spanning-tree mode rapid-pvst
spanning-tree extend system-id
spanning-tree vlan 11 priority 24576
spanning-tree vlan 30 priority 28672
!
vlan internal allocation policy ascending
!
interface FastEthernet0/1
switchport access vlan 11
 switchport mode access
!
interface FastEthernet0/2
switchport access vlan 11
switchport mode access
!
interface FastEthernet0/3
switchport trunk native vlan 99
switchport trunk allowed vlan 11,30
switchport mode trunk
!
interface FastEthernet0/4
switchport trunk native vlan 99
switchport trunk allowed vlan 11,30
switchport mode trunk
!
interface range FastEthernet0/5-24
shutdown
!
interface GigabitEthernet0/1
shutdown
!
interface GigabitEthernet0/2
shutdown
!
interface Vlan1
no ip address
no ip route-cache
!
interface Vlan11
ip address 192.168.11.2 255.255.255.0
no ip route-cache
!
ip http server
!
control-plane
!
line con 0
exec-timeout 5 0
logging synchronous
line vty 0 4
password ciscoccna
login
line vty 5 15
no login
!
end
!-----------------------------------------
! S3
!-----------------------------------------
no service password-encryption
!
hostname S3
!
security passwords min-length 6
enable secret ciscoccna
!
no aaa new-model
vtp domain CCNA_Troubleshooting
vtp mode Server
vtp password ciscoccna
ip subnet-zero
!
no ip domain-lookup
!
no file verify auto
!
spanning-tree mode rapid-pvst
spanning-tree extend system-id
spanning-tree vlan 11 priority 28672
spanning-tree vlan 30 priority 24576
!
vlan internal allocation policy ascending
!
Vlan 11,30
!
interface FastEthernet0/1
switchport trunk allowed vlan 11,30
switchport mode trunk
!
interface FastEthernet0/2
switchport access vlan 30
switchport mode access
!
interface FastEthernet0/3
switchport trunk native vlan 99
switchport trunk allowed vlan 11,30
switchport mode trunk
!
interface FastEthernet0/4
switchport trunk native vlan 99
switchport trunk allowed vlan 11,30
switchport mode trunk
!
interface range FastEthernet0/5-24
shutdown
!
interface GigabitEthernet0/1
shutdown
!
interface GigabitEthernet0/2
shutdown
!
interface Vlan1
no ip address
no ip route-cache
!
interface Vlan30
ip address 192.168.30.2 255.255.255.0
no ip route-cache
!
ip default-gateway 192.168.30.1
ip http server
!
control-plane
!
!
line con 0
exec-timeout 5 0
logging synchronous
line vty 0 4
password ciscoccna
login
line vty 5 15
no login
!
end

Task 5: Clean Up

Erase the configurations and reload the routers. Disconnect and store the cabling. For PC hosts that are normally connected to other networks (such as the school LAN or to the Internet), reconnect the appropriate cabling and restore the TCP/IP settings.

Alternate Configurations

These configurations can be used as the starting point. There are fewer errors in these configurations. Again, the same troubleshooting methods and commands should be used to isolate and resolve the problems. The corrected network configurations are the same as for the original configurations.

!------------------------------------------
! R1
!------------------------------------------
no service password-encryption
!
hostname R1
!
boot-start-marker
boot-end-marker
!
security passwords min-length 6
enable secret 5 ciscoccna
!
ip cef
!
ip dhcp pool Access1
network 192.168.10.0 255.255.255.0
default-router 192.168.10.1
!
no ip domain lookup
frame-relay switching
!
key chain RIP_KEY
key 1
key-string cisco
!Must create a key chain to be used for RIP authentication to work.
!
username R3 password 0 ciscoccna
username ccna password 0 ciscoccna
!
interface FastEthernet0/0
ip address 192.168.10.1 255.255.255.0
ip rip authentication mode md5
ip rip authentication key-chain RIP_KEY
no shutdown
!
interface FastEthernet0/1
ip address 192.168.11.1 255.255.255.0
ip rip authentication mode md5
ip rip authentication key-chain RIP_KEY
no shutdown
!
interface Serial0/0/0
ip address 10.1.1.1 255.255.255.252
ip rip authentication mode md5
ip rip authentication key-chain RIP_KEY
encapsulation frame-relay
clockrate 128000
frame-relay map ip 10.1.1.1 201
frame-relay map ip 10.1.1.2 201 broadcast
no frame-relay inverse-arp
no shutdown
frame-relay intf-type dce
!
interface Serial0/0/1
ip address 10.3.3.1 255.255.255.252
ip rip authentication mode md5
ip rip authentication key-chain RIP_KEY
encapsulation ppp
ppp authentication chap
no shutdown
!
!
router rip
version 2
passive-interface default
no passive-interface FastEthernet0/0
no passive-interface FastEthernet0/1
no passive-interface Serial0/0/0
no passive-interface Serial0/0/1
! Interfaces must be put into a non-passive state to propagate RIP
! Updates when the passive interface default command is entered.
 network 10.0.0.0
network 192.168.10.0
network 192.168.11.0
no auto-summary
!
ip classless
!
no ip http server
ip http server
! The HTTP server was most likely disabled for security reasons.
! However, for SDM to be accessible, the HTTP server must be enabled.
!
ip access-list standard Anti-spoofing
 permit 192.168.10.0 0.0.0.255
 deny any
ip access-list standard VTY
 permit 10.0.0.0 0.255.255.255
 permit 192.168.10.0 0.0.0.255
 permit 192.168.11.0 0.0.0.255
 permit 192.168.20.0 0.0.0.255
 permit 192.168.30.0 0.0.0.255
!
line con 0
 exec-timeout 0 0
 logging synchronous
line aux 0
line vty 0 4
 access-class VTY in
 login local
!
end
!------------------------------------------
! R2
!------------------------------------------
no service password-encryption
!
hostname R2
!
security passwords min-length 6
enable secret ciscoccna
!
aaa new-model
!
aaa authentication login LOCAL_AUTH local
aaa authentication login local_auth local
! The authentication list name is case-sensitive, therefore vty lines
! try to authenticate against a list that does not exist. Case and
! spelling errors are among the most common.
aaa session-id common
!
ip cef
!
no ip domain lookup
!
key chain RIP_KEY
key 1
key-string cisco
username ccna password 0 ciscoccna
!
interface Loopback0
description Simulated ISP Connection
ip address 209.165.200.245 255.255.255.224
!
interface FastEthernet0/0
ip address 192.168.20.1 255.255.255.0
ip access-group TFTP out
ip access-group Anti-spoofing in
ip nat outside
duplex auto
speed auto
!
interface FastEthernet0/1
no ip address
shutdown
duplex auto
speed auto
!
interface Serial0/0/0
ip address 10.1.1.2 255.255.255.0
ip address 10.1.1.2 255.255.255.252
ip nat inside
encapsulation frame-relay
no keepalive
frame-relay map ip 10.1.1.1 201 broadcast
frame-relay map ip 10.1.1.2 201
no frame-relay inverse-arp
!
interface Serial0/0/1
ip address 10.2.2.1 255.255.255.0
ip address 10.2.2.1 255.255.255.252
! After using the /24 subnet so frequently, subnet masks are easily
! mistyped.
 ip access-group R3-telnet in
 ip nat inside
 ip rip authentication mode md5
 ip rip authentication key-chain RIP_KEY
 clockrate 128000
!
!
router rip
 version 2
 passive-interface default
 no passive-interface Serial0/0/0
 no passive-interface Serial0/0/1
 network 10.0.0.0
 network 192.168.20.0
 default-information originate
 no auto-summary
!
ip classless
ip route 0.0.0.0 0.0.0.0 209.165.200.226
!
no ip http server
ip nat inside source list NAT interface FastEthernet0/0 overload
!
ip access-list standard Anti-spoofing
 permit 192.168.20.0 0.0.0.255
 deny any
ip access-list standard NAT
 permit 10.0.0.0 0.255.255.255
 permit 192.168.0.0 0.0.255.255
!
ip access-list extended R3-telnet
 deny tcp host 10.2.2.2 host 10.2.2.1 eq telnet
 deny tcp host 10.3.3.2 host 10.2.2.1 eq telnet
 deny tcp host 192.168.11.3 host 10.2.2.1 eq telnet
 deny tcp host 192.168.30.1 host 10.2.2.1 eq telnet
 permit ip any any
!
ip access-list standard TFTP
 permit 192.168.20.0 0.0.0.255
!
control-plane
!
line con 0
 exec-timeout 0 0
 logging synchronous
line aux 0
 exec-timeout 15 0
 logging synchronous
 login authentication local_auth
 transport output telnet
line vty 0 4
 exec-timeout 15 0
 logging synchronous
 login authentication local_auth
 transport input telnet
!
end
!------------------------------------------
! R3
!------------------------------------------
no service password-encryption
!
hostname R3
!
security passwords min-length 6
enable secret ciscoccna
!
no aaa new-model
!
ip cef
!
no ip domain lookup
!
key chain RIP_KEY
 key 1
 key-string cisco
username R1 password 0 ciscoccna
username ccna password 0 ciscoccna
!
interface FastEthernet0/1
 no shutdown
!
interface FastEthernet0/1.11
 encapsulation dot1Q 11
 ip address 192.168.11.3 255.255.255.0
 ip address 192.168.11.3 255.255.255.0
ip rip authentication mode md5
 ip rip authentication key-chain RIP_KEY
 no snmp trap link-status
!
interface FastEthernet0/1.30
 encapsulation dot1Q 30
 ip address 192.168.30.1 255.255.255.0
ip rip authentication mode md5
 ip rip authentication key-chain RIP_KEY
 ip access-group Anti-spoofing in
 no snmp trap link-status
!
!
interface Serial0/0/0
 ip address 10.3.3.2 255.255.255.252
ip rip authentication mode md5
 ip rip authentication key-chain RIP_KEY
 encapsulation ppp
 clockrate 125000
 ppp authentication chap
!
interface Serial0/0/1
ip address 10.2.2.2 255.255.255.252
ip rip authentication mode md5
ip rip authentication key-chain RIP_KEY
! All of the other routers are using authentication. Therefore, without
! this command on each interface that sends RIP updates, this router
! will not be able to participate in RIP.
!
router rip
 version 2
 passive-interface default
 no passive-interface FastEthernet0/0.11
 no passive-interface FastEthernet0/0.30
 no passive-interface Serial0/0/0
 no passive-interface Serial0/0/1
 network 10.0.0.0
 network 192.168.11.0
 network 192.168.30.0
 no auto-summary
!
ip classless
!
ip http server
!
ip access-list standard Anti-spoofing
 permit 192.168.30.0 0.0.0.255
 deny any
ip access-list standard VTY
 permit 10.0.0.0 0.255.255.255
 permit 192.168.10.0 0.0.0.255
 permit 192.168.11.0 0.0.0.255
 permit 192.168.20.0 0.0.0.255
 permit 192.168.30.0 0.0.0.255
!
control-plane
!
line con 0
 exec-timeout 0 0
 logging synchronous
line aux 0
 exec-timeout 15 0
 logging synchronous
line vty 0 4
 access-class VTY in
 exec-timeout 15 0
 logging synchronous
 login local
!
end
!-----------------------------------------
! S1
!-----------------------------------------
no service password-encryption
!
hostname S1
!
security passwords min-length 6
enable secret ciscoccna
!
no aaa new-model
vtp domain CCNA_Troubleshooting
vtp mode transparent
vtp password ciscoccna
ip subnet-zero
!
no ip domain-lookup
!
no file verify auto
spanning-tree mode pvst
spanning-tree extend system-id
!
vlan internal allocation policy ascending
!
vlan 10
!
interface FastEthernet0/1
 switchport access vlan 10
 switchport mode access
!
interface FastEthernet0/2
 switchport access vlan 10
 switchport mode access
!
interface range FastEthernet0/3-24
!
interface GigabitEthernet0/1
 shutdown
!
interface GigabitEthernet0/2
 shutdown
!
interface Vlan1
 no ip address
 no ip route-cache
!
interface Vlan10
 ip address dhcp
 no ip route-cache
!
ip default-gateway 192.168.10.1
ip http server
!
control-plane
!
line con 0
 exec-timeout 0 0
 logging synchronous
line vty 0 4
 password ciscoccna
 login
line vty 5 15
 no login
!
end
!-----------------------------------------
! S2
!-----------------------------------------
no service password-encryption
!
hostname S2
!
security passwords min-length 6
enable secret ciscoccna
!
no aaa new-model
vtp domain CCNA_Troubleshooting
vtp mode transparent
vtp mode client
! NOTE: Because the server was already configured, the VLAN information
! will not be passed to Switch3 until there is a new revision. This can
! be caused by creating and then deleting a VLAN on Switch2, the VTP
! server.
vtp password ciscoccna
ip subnet-zero
!
no ip domain-lookup
!
no file verify auto
!
spanning-tree mode rapid-pvst
spanning-tree extend system-id
spanning-tree vlan 11 priority 24576
spanning-tree vlan 30 priority 28672
!
vlan internal allocation policy ascending
!
interface FastEthernet0/1
 switchport access vlan 11
 switchport mode access
!
interface FastEthernet0/2
 switchport access vlan 11
 switchport mode access
!
interface FastEthernet0/3
 switchport trunk native vlan 99
 switchport trunk allowed vlan 11,30
 switchport mode trunk
!
interface FastEthernet0/4
 switchport trunk native vlan 99
 switchport trunk allowed vlan 11,30
 switchport mode trunk
!
interface range FastEthernet0/5-24
 shutdown
!
interface GigabitEthernet0/1
 shutdown
!
interface GigabitEthernet0/2
 shutdown
!
interface Vlan1
 no ip address
 no ip route-cache
!
interface Vlan11
 ip address 192.168.11.2 255.255.255.0
 no ip route-cache
!
ip http server
!
control-plane
!
line con 0
 exec-timeout 0 0
 logging synchronous
line vty 0 4
 password ciscoccna
 login
line vty 5 15
 no login
!
end
!-----------------------------------------
! S3
!-----------------------------------------
no service password-encryption
!
hostname S3
!
security passwords min-length 6
enable secret ciscoccna
!
no aaa new-model
vtp domain CCNA_troubleshooting
vtp domain CCNA_Troubleshooting
! The VTP mode is case-sensitive, so a typo like this will prevent VTP
! from working properly. The switch should display an error about a
! domain mismatch when the trunk links come up.
vtp mode server
vtp password ciscoccna
ip subnet-zero
!
no ip domain-lookup
!
no file verify auto
!
spanning-tree mode rapid-pvst
spanning-tree extend system-id
spanning-tree vlan 11 priority 28672
spanning-tree vlan 30 priority 24576
!
vlan internal allocation policy ascending
!
vlan 11,30
! It is a common mistake to forget to create VLANs, especially if they
! are already allowed on trunk links.
!
interface FastEthernet0/1
 switchport trunk allowed vlan 30
switchport trunk allowed vlan 11,30
! VLAN 11 must be allowed on the trunk to R3 to obtain connectivity to
! R2
 switchport mode trunk 
!
interface FastEthernet0/2
 switchport access vlan 30
 switchport mode access
!
interface FastEthernet0/3
 switchport trunk native vlan 99
 switchport trunk allowed vlan 11,30
 switchport mode trunk
!
interface FastEthernet0/4
 switchport trunk native vlan 99
 switchport trunk allowed vlan 11,30
 switchport mode trunk
!
interface range FastEthernet0/5-24
 shutdown
!
interface GigabitEthernet0/1
 shutdown
!
interface GigabitEthernet0/2
 shutdown
!
interface Vlan1
 no ip address
 no ip route-cache
!
interface Vlan30
 ip address 192.168.30.2 255.255.255.0
 no ip route-cache
!
ip default-gateway 192.168.30.1
ip http server
!
control-plane
!
line con 0
 exec-timeout 5 0
 logging synchronous
line vty 0 4
 password ciscoccna
 login
line vty 5 15
 no login
!
end