5.1.3 Lab – Troubleshoot EIGRP for IPv6 (Answers)

5.1.3 Lab – Troubleshoot EIGRP for IPv6 (Answers)

Instructor Note: Red font color or gray highlights indicate text that appears in the instructor copy only.

Topology

Addressing Table

Objectives

Troubleshoot network issues related to the configuration and operation of EIGRP for IPv6.

Background / Scenario

In this topology, R1, R2, R3, D1, and D2 are EIGRP neighbors. Switch D1 provides connectivity for a large branch of the network, R2 provides connectivity for a small branch, R3 supports a single LAN enclave, and switch D2 provides both an internet connection and an extranet connection. You will be loading configurations with intentional errors onto the network. Your tasks are to FIND the error(s), document your findings and the command(s) or method(s) used to fix them, FIX the issue(s) presented here and then test the network to ensure both of the following conditions are met:

1) the complaint received in the ticket is resolved
2) full reachability is restored

Note: The routers used with CCNP hands-on labs are Cisco 4221 with Cisco IOS XE Release 16.9.4 (universalk9 image). The switches used in the labs are Cisco Catalyst 3650 with Cisco IOS XE Release 16.9.4 (universalk9 image). Other routers, switches, and Cisco IOS versions can be used. Depending on the model and Cisco IOS version, the commands available and the output produced might vary from what is shown in the labs. Refer to the Router Interface Summary Table at the end of the lab for the correct interface identifiers.

Note: Make sure that the switches have been erased and have no startup configurations. If you are unsure, contact your instructor.

Instructor Note: Refer to the Instructor Lab Manual for the procedures to initialize and reload devices.

Required Resources

• 3 Routers (Cisco 4221 with Cisco IOS XE Release 16.9.4 universal image or comparable)
• 2 Switches (Cisco 3560 with Cisco IOS XE Release 16.9.4 universal image or comparable)
• 1 PC (Choice of operating system with terminal emulation program installed)
• Console cables to configure the Cisco IOS devices via the console ports
• Ethernet and serial cables as shown in the topology

Instructions

Part 1: Trouble Ticket 5.1.3.1

Scenario:

You took a spring break vacation, leaving the junior network administrator with some seemingly simple tasks. The routing table was to be reduced in size while the extranet on D2 and the enclave on R3 would not be visible in the routing table at all. Routing to the internet via D2 should work. Future additions to the large branch at R1 should be accounted for in the routing table so that when those networks are added (the network addresses are 2001:db8:acad:1004::/64, 2001:db8:acad:1005::/64, 2001:db8:acad:1006::/64, and 2001:db8:acad:1007::/64), there is no change to the routing table. The junior network administrator was not very successful. Now it is up to you to find and fix the misconfigurations before the CIO returns.

Use the commands listed below to load the configuration files for this trouble ticket:

Instructor Note: Commands for uploading the configuration are provided at the end of this document.

• Passwords on all devices are cisco12345. If a username is required, use admin.
• When you have fixed the ticket, change the MOTD on EACH DEVICE using the following command:

banner motd # This is $(hostname) FIXED from ticket <ticket number> #

• Then save the configuration by issuing the wri command (on each device).
• Inform your instructor that you are ready for the next ticket.
• After the instructor approves your solution for this ticket, issue the reset.now privileged EXEC command. This script will clear your configurations and reload the devices.

Instructor Notes:

This trouble ticket contains 4 intentional errors:

1) Stub router D1 is configured as Receive-Only, so its summary for Lo0-Lo4 is not being advertised. Because that summary is not being advertised, R1’s summary for the future range of networks is not being advertised.

2) R2 is configured to advertise a summary route of ::/0, when it should be a summary route of 2001:db8:acad:2000::/63.

3) R3 Loopback0 is being advertised into EIGRP, but it should not be.

4) The prefix list used by the distribute list on D2 is incorrectly configured, resulting in the default route that D2 is redistributing not being advertised. If the student does not fix the prefix list correctly, the extranet routes will appear in internal routing tables, which is not desired.

The commands used to fix these errors should be:

R2(config)# interface g0/0/0
R2(config-if)# no ipv6 summary-address eigrp 513 ::/0
R2(config-if)# ipv6 summary-address eigrp 513 2001:db8:acad:2000::/63
R2(config-if)# exit
R2(config)# interface g0/0/1
R2(config-if)# no ipv6 summary-address eigrp 513 ::/0
R2(config-if)# ipv6 summary-address eigrp 513 2001:db8:acad:2000::/63
R2(config-if)# end

R3(config)# router eigrp LAB513
R3(config-router)# address-family ipv6 unicast autonomous-system 513
R3(config-router-af)# af-interface loopback 0
R3(config-router-af-interface)# shutdown
R3(config-router-af-interface)# exit
R3(config-router-af)# exit
R3(config-router)# exit
R3(config)# end

D1(config)# router eigrp LAB513
D1(config-router)# address-family ipv6 unicast autonomous-system 513
D1(config-router-af)# no eigrp stub receive-only
D1(config-router-af)# eigrp stub
D1(config-router-af)# exit
D1(config-router)# exit
D1(config)# end

D2(config)# no ipv6 prefix-list NO-EXTRA
D2(config)# ipv6 prefix-list NO-EXTRA seq 5 permit ::/0
D2(config)# end

Router Interface Summary Table

Note: To find out how the router is configured, look at the interfaces to identify the type of router and how many interfaces the router has. There is no way to effectively list all the combinations of configurations for each router class. This table includes identifiers for the possible combinations of Ethernet and Serial interfaces in the device. The table does not include any other type of interface, even though a specific router may contain one. An example of this might be an ISDN BRI interface. The string in parenthesis is the legal abbreviation that can be used in Cisco IOS commands to represent the interface.

Uploading Configuration Files

Use the commands below to create the configuration files on the lab devices for each trouble ticket in this lab. The TCL script commands help create and copy the configurations. However, the configuration commands could also be copied and pasted directly into global config mode on each device. Simply remove the TCL script commands, enter the enable and configure t commands on the device, and copy and paste the configuration commands.

Important: The device requires a folder in flash named enarsi. Use the dir command to verify. If the folder is missing, then create it using the mkdir flash:/enarsi privileged exec command. For all switches, make sure the vlan.dat file is set to the default. Use the delete vlan.dat privileged EXEC command, if necessary.

Reset scripts

These TCL scripts will completely clear and reload the device in preparation for the next ticket. Copy and paste the appropriate script to the appropriate device.

Router Reset Script

tclsh
puts [ open "flash:/enarsi/reset.tcl" w+ ] {
typeahead "\n"
copy running-config startup-config
typeahead "\n"
erase startup-config
puts "Reloading the router"
typeahead "\n"
reload
}
tclquit

D1/D2 (Cisco 3650) Reset Script – The default 3650 SDM template supports IPv6 by default, so it is not set by this script.

tclsh
puts [ open "flash:/enarsi/reset.tcl" w+ ] {
typeahead "\n"
copy running-config startup-config
typeahead "\n"
erase startup-config
delete /force vlan.dat
puts "Reloading the switch"
typeahead "\n"
reload
}
tclquit

A1 (Cisco 2960 Script) – The default 2960 SDM template does not support IPv6, so this script includes that setting.

tclsh
puts [ open "flash:reset.tcl" w+ ] {
typeahead "\n"
copy running-config startup-config
typeahead "\n"
erase startup-config
delete /force vlan.dat
delete /force multiple-fs
ios_config "sdm prefer lanbase-routing"
typeahead "\n"
puts "Reloading the switch in 1 minute, type reload cancel to halt"
typeahead "\n"
reload
}
tclquit

R1 Configuration File Scripts

! R1 – Trouble Ticket # 1

tclsh
puts [ open "flash:/enarsi/5.1.3.1-r1-config.txt" w+ ] {
hostname R1
ipv6 unicast-routing
no ip domain lookup
enable secret cisco12345
username admin algorithm-type scrypt secret cisco12345
interface g0/0/0
 ipv6 address fe80::1:1 link-local
 ipv6 address 2001:db8:12::1/64
 no shutdown
 exit
interface g0/0/1
 ipv6 address fe80::1:2 link-local
 ipv6 address 2001:db8:1d1::1/64
 no shutdown
 exit
interface s0/1/0
 ipv6 address fe80::1:3 link-local
 ipv6 address 2001:db8:13::1/64
 no shutdown
 exit
router eigrp LAB513
 address-family ipv6 unicast autonomous-system 513
 eigrp router-id 1.1.1.1
 af-interface g0/0/0
  summary-address 2001:db8:acad:1000::/60
  exit
 af-interface s0/1/0
  summary-address 2001:db8:acad:1000::/60
  exit
 exit
line con 0
 logging synchronous
 exec-timeout 0 0
 exit
line vty 0 4
 login local
 transport input telnet
 exit
alias exec reset.now tclsh flash:/enarsi/reset.tcl
end
}
tclquit

R2 Configuration File Scripts

! R2 – Trouble Ticket # 1

tclsh
puts [ open "flash:/enarsi/5.1.3.1-r2-config.txt" w+ ] {
hostname R2
ipv6 unicast-routing
no ip domain lookup
enable secret cisco12345
username admin algorithm-type scrypt secret cisco12345
interface g0/0/0
 ipv6 address fe80::2:1 link-local
 ipv6 address 2001:db8:12::2/64
 no shutdown
 exit
interface g0/0/1
 ipv6 address fe80::2:2 link-local
 ipv6 address 2001:db8:23::2/64
 no shutdown
 exit
interface loopback 0
 ipv6 address fe80::2:3 link-local
 ipv6 address 2001:db8:acad:2000::1/64
 no shutdown
 exit
interface loopback 1
 ipv6 address fe80::2:4 link-local
 ipv6 address 2001:db8:acad:2001::1/64
 no shutdown
 exit
ipv6 router eigrp 513
 eigrp router-id 2.2.2.2
 exit
interface g0/0/0
 ipv6 eigrp 513
 ipv6 summary-address eigrp 513 ::/0
 exit
interface g0/0/1
 ipv6 eigrp 513
 ipv6 summary-address eigrp 513 ::/0
 exit
interface loopback 0
 ipv6 eigrp 513
 exit
line con 0
 logging synchronous
 exec-timeout 0 0
 exit
line vty 0 4
 login local
 transport input telnet
 exit
alias exec reset.now tclsh flash:/enarsi/reset.tcl
end
}
tclquit

R3 Configuration File Scripts

!R3 – Trouble Ticket # 1

tclsh
puts [ open "flash:/enarsi/5.1.3.1-r3-config.txt" w+ ] {
hostname R3
ipv6 unicast-routing
no ip domain lookup
enable secret cisco12345
username admin algorithm-type scrypt secret cisco12345
interface g0/0/0
 ipv6 address fe80::3:1 link-local
 ipv6 address 2001:db8:23::3/64
 no shutdown
 exit
interface g0/0/1
 ipv6 address fe80::3:2 link-local
 ipv6 address 2001:db8:3d2::1/64
 no shutdown
 exit
interface s0/1/0
 ipv6 address fe80::3:3 link-local
 ipv6 address 2001:db8:13::3/64
 no shutdown
 exit
interface loopback 0
 ipv6 address fe80::3:4 link-local
 ipv6 address 2001:db8:acad:3000::1/64
 no shutdown
 exit
router eigrp LAB513
 address-family ipv6 unicast autonomous-system 513
  eigrp router-id 3.3.3.3
  exit
 exit
line con 0
 logging synchronous
 exec-timeout 0 0
 exit
line vty 0 4
 login local
 transport input telnet
 exit
alias exec reset.now tclsh flash:/enarsi/reset.tcl
end
}
tclquit

D1 Configuration File Scripts

! D1 – Trouble Ticket # 1

tclsh
puts [ open "flash:/enarsi/5.1.3.1-d1-config.txt" w+ ] {
hostname D1
ipv6 unicast-routing
no ip domain lookup
enable secret cisco12345
username admin algorithm-type scrypt secret cisco12345
interface range g1/0/1 - 24
 switchport mode access
 shutdown
 exit
interface g1/0/11
 no switchport
 ipv6 address fe80::d1:1 link-local
 ipv6 address 2001:db8:1d1::2/64
 no shutdown
 exit
interface loopback 0
 ipv6 address fe80::d1:2 link-local
 ipv6 address 2001:db8:acad:1000::1/64
 no shutdown
 exit
interface loopback 1
 ipv6 address fe80::d1:3 link-local
 ipv6 address 2001:db8:acad:1001::1/64
 no shutdown
 exit
interface loopback 2
 ipv6 address fe80::d1:4 link-local
 ipv6 address 2001:db8:acad:1002::1/64
 no shutdown
 exit
interface loopback 3
 ipv6 address fe80::d1:5 link-local
 ipv6 address 2001:db8:acad:1003::1/64
 no shutdown
 exit
router eigrp LAB513
 address-family ipv6 unicast autonomous-system 513
  eigrp router-id 131.131.131.131
  eigrp stub receive-only
  af-interface g1/0/11
   summary-address 2001:db8:acad:1000::/62
   exit
 exit
line con 0
 logging synchronous
 exec-timeout 0 0
 exit
line vty 0 4
 login local
 transport input telnet
 exit
alias exec reset.now tclsh flash:/enarsi/reset.tcl
end
}
tclquit

D2 Configuration File Scripts

! D2- Trouble Ticket # 1

tclsh
puts [ open "flash:/enarsi/5.1.3.1-d2-config.txt" w+ ] {
hostname D2
ipv6 unicast-routing
no ip domain lookup
enable secret cisco12345
username admin algorithm-type scrypt secret cisco12345
interface range g1/0/1 - 24
 switchport mode access
 shutdown
 exit
interface g1/0/11
 no switchport
 ipv6 address fe80::d2:1 link-local
 ipv6 address 2001:db8:3d2::2/64
 no shutdown
 exit
interface loopback 0
 description SIMULATED INTERNET
 ipv6 address fe80::d2:2 link-local
 ipv6 address 2001:db8:acad:4000::1/64
 no shutdown
 exit
interface loopback 1
 description SIMULATED EXTRANET
 ipv6 address fe80::d2:3 link-local
 ipv6 address 2001:db8:acad:4001::1/64
 no shutdown
 exit
ipv6 prefix-list NO-EXTRA seq 5 deny 2001:db8:acad:4000::/63
ipv6 route ::/0 loopback 0 
ipv6 route 3ff3:db8:acad::/48 loopback 1
router eigrp LAB513
 address-family ipv6 unicast autonomous-system 513
  eigrp router-id 132.132.132.132
 topology base
  redistribute static
  distribute-list prefix NO-EXTRA out g1/0/11
 exit
line con 0
 logging synchronous
 exec-timeout 0 0
 exit
line vty 0 4
 login local
 transport input telnet
 exit
alias exec reset.now tclsh flash:/enarsi/reset.tcl
end
}
tclquit

A1 Configuration File Scripts – Not Used In This Lab

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