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
Device | Interface | IPv6 Address/Prefix Length | Link-Local Address |
---|---|---|---|
R1 | G0/0/0 | 2001:db8:12::1/64 | fe80::1:1 |
G0/0/1 | 2001:db8:1d1::1/64 | fe80::1:2 | |
S0/1/0 | 2001:db8:13::1/64 | fe80::1:3 | |
R2 | G0/0/0 | 2001:db8:12::2/64 | fe80::2:1 |
G0/0/1 | 2001:db8:23::2/64 | fe80::2:2 | |
Loopback 0 | 2001:db8:acad:2000::1/64 | fe80::2:3 | |
Loopback 1 | 2001:db8:acad:2001::1/64 | fe80::2:4 | |
R3 | G0/0/0 | 2001:db8:23::3/64 | fe80::3:1 |
G0/0/1 | 2001:db8:3d2::1/64 | fe80::3:2 | |
S0/1/0 | 2001:db8:13::3/64 | fe80::3:3 | |
Loopback 0 | 2001:db8:acad:3000::1/64 | fe80::3:4 | |
D1 | G1/0/11 | 2001:db8:1d1::2/64 | fe80::d1:1 |
Loopback 0 | 2001:db8:acad:1000::1/64 | fe80::d1:2 | |
Loopback 1 | 2001:db8:acad:1001::1/64 | fe80::d1:3 | |
Loopback 2 | 2001:db8:acad:1002::1/64 | fe80::d1:4 | |
Loopback 3 | 2001:db8:acad:1003::1/64 | fe80::d1:5 | |
D2 | G1/0/11 | 2001:db8:3d2::2/64 | fe80::d2:1 |
Loopback 0 | 2001:db8:acad:4000::1/64 | fe80::d2:2 | |
Loopback 1 | 2001:db8:acad:4001::1/64 | fe80::d2:3 |
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.
Device | Command |
---|---|
R1 | copy flash:/enarsi/5.1.3.1-r1-config.txt run |
R2 | copy flash:/enarsi/5.1.3.1-r2-config.txt run |
R3 | copy flash:/enarsi/5.1.3.1-r3-config.txt run |
D1 | copy flash:/enarsi/5.1.3.1-d1-config.txt run |
D2 | copy flash:/enarsi/5.1.3.1-d2-config.txt run |
• 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
Router Model | Ethernet Interface #1 | Ethernet Interface #2 | Serial Interface #1 | Serial Interface #2 |
---|---|---|---|---|
1800 | Fast Ethernet 0/0 (F0/0) | Fast Ethernet 0/1 (F0/1) | Serial 0/0/0 (S0/0/0) | Serial 0/0/1 (S0/0/1) |
1900 | Gigabit Ethernet 0/0 (G0/0) | Gigabit Ethernet 0/1 (G0/1) | Serial 0/0/0 (S0/0/0) | Serial 0/0/1 (S0/0/1) |
2801 | Fast Ethernet 0/0 (F0/0) | Fast Ethernet 0/1 (F0/1) | Serial 0/1/0 (S0/1/0) | Serial 0/1/1 (S0/1/1) |
2811 | Fast Ethernet 0/0 (F0/0) | Fast Ethernet 0/1 (F0/1) | Serial 0/0/0 (S0/0/0) | Serial 0/0/1 (S0/0/1) |
2900 | Gigabit Ethernet 0/0 (G0/0) | Gigabit Ethernet 0/1 (G0/1) | Serial 0/0/0 (S0/0/0) | Serial 0/0/1 (S0/0/1) |
4221 | Gigabit Ethernet 0/0/0 (G0/0/0) | Gigabit Ethernet 0/0/1 (G0/0/1) | Serial 0/1/0 (S0/1/0) | Serial 0/1/1 (S0/1/1) |
4300 | Gigabit Ethernet 0/0/0 (G0/0/0) | Gigabit Ethernet 0/0/1 (G0/0/1) | Serial 0/1/0 (S0/1/0) | Serial 0/1/1 (S0/1/1) |
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