7.2.3.6 Lab – Troubleshooting Basic EIGRP for IPv4 and IPv6 (Instructor Version)
Instructor Note: Red font color or Gray highlights indicate text that appears in the instructor copy only.
Topology
Addressing Table
| Device | EIGRP Router ID | Interface | IP Address | Default Gateway |
|---|---|---|---|---|
| R1 | 1.1.1.1 | G0/0 | 192.168.1.1/24 2001:DB8:ACAD:A::1/64 FE80::1 link-local | N/A |
| S0/0/0 (DCE) | 192.168.12.1/30 2001:DB8:ACAD:12::1/64 FE80::1 link-local | N/A | ||
| S0/0/1 | 192.18.13.1/30 2001:DB8:ACAD:13::1/64 FE80::1 link-local | N/A | ||
| R2 | 2.2.2.2 | G0/0 | 192.168.2.1/24 2001:DB8:ACAD:B::2/64 FE80::2 link-local | N/A |
| S0/0/0 | 192.168.12.2/30 2001:DB8:ACAD:12::2/64 FE80::2 link-local | N/A | ||
| S0/0/1 (DCE) | 192.168.23.1/30 2001:DB8:ACAD:23::2/64 FE80::2 link-local | N/A | ||
| R3 | 3.3.3.3 | G0/0 | 192.168.3.1/24 2001:DB8:ACAD:C::3/64 FE80::3 link-local | N/A |
| S0/0/0 (DCE) | 192.168.13.2/30 2001:DB8:ACAD:13::3/64 FE80::3 link-local | N/A | ||
| S0/0/1 | 192.168.23.2/30 2001:DB8:ACAD:23::3/64 FE80::3 link-local | N/A | ||
| PC-A | NIC | 192.168.1.3/24 2001:DB8:ACAD:A::A/64 | 192.168.1.1 FE80::1 | |
| PC-B | NIC | 192.168.2.3/24 2001:DB8:ACAD:B::B/64 | 192.168.2.1 FE80::2 | |
| PC-C | NIC | 192.168.3.3/24 2001:DB8:ACAD:C::C/64 | 192.168.3.1 FE80::3 |
Objectives
- Part 1: Build the Network and Load Device Configurations
- Part 2: Troubleshoot Layer 3 Connectivity
- Part 3: Troubleshoot EIGRP for IPv4
- Part 4: Troubleshoot EIGRP for IPv6
Background / Scenario
The Enhanced Interior Gateway Routing Protocol (EIGRP) is an advanced distance vector routing protocol developed by Cisco Systems. EIGRP routers discover neighbors and establish and maintain adjacencies with neighbor routers using Hello packets. An EIGRP router assumes that as long as it is receiving Hello packets from a neighboring router, that neighbor is up and its routes remain viable.
EIGRP for IPv4 runs over the IPv4 network layer, communicating with other EIGRP IPv4 peers, and advertising only IPv4 routes. EIGRP for IPv6 has the same functionality as EIGRP for IPv4 but uses IPv6 as the network layer protocol, communicating with EIGRP for IPv6 peers and advertising IPv6 routes.
In this lab, you will troubleshoot a network that runs EIGRP for IPv4 and EIGRP for IPv6 routing protocols. This network is experiencing problems and you are tasked with finding the problems and correcting them.
Note: The routers used with CCNA hands-on labs are Cisco 1941 Integrated Services Routers (ISRs) with Cisco IOS Release 15.2(4)M3 (universalk9 image). Other routers and Cisco IOS versions can be used. Depending on the model and Cisco IOS version, the commands available and output produced might vary from what is shown in the labs. Refer to the Router Interface Summary Table at the end of this lab for the correct interface identifiers.
Note: Make sure that the routers 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 Router (Cisco 1941 with Cisco IOS Release 15.2(4)M3 universal image or comparable)
- 3 PCs (Windows 7, Vista, or XP with terminal emulation program, such as Tera Term)
- Console cables to configure the Cisco IOS devices via the console ports
- Ethernet and serial cables as shown in the topology
Part 1: Build the Network and Load Device Configurations
In Part 1, you will set up the network topology and configure basic settings on the PC hosts and routers.
Step 1: Cable the network as shown in the topology.
Step 2: Configure PC hosts.
Step 3: Load router configurations.
Load the following configurations into the appropriate router. All routers have the same passwords. The privileged EXEC password is class, and the console and vty password is cisco.
Router R1 Configuration:
conf t service password-encryption hostname R1 enable secret class no ip domain lookup ipv6 unicast-routing interface GigabitEthernet0/0 ip address 192.168.1.1 255.255.255.0 duplex auto speed auto ipv6 address FE80::1 link-local ipv6 address 2001:DB8:ACAD:A::1/64 ipv6 eigrp 1 no shutdown interface Serial0/0/0 bandwidth 128 ip address 192.168.21.1 255.255.255.252 !ip address 192.168.12.1 255.255.255.252 ipv6 address FE80::1 link-local ipv6 address 2001:DB8:ACAD:12::1/64 ipv6 eigrp 1 clock rate 128000 no shutdown interface Serial0/0/1 !bandwidth 128 ip address 192.168.13.1 255.255.255.252 ipv6 address FE80::1 link-local ipv6 address 2001:DB8:ACAD:31::1/64 !ipv6 address 2001:DB8:ACAD:13::1/64 ipv6 eigrp 1 no shutdown router eigrp 1 network 192.168.1.0 network 192.168.12.0 0.0.0.3 network 192.168.13.0 0.0.0.3 passive-interface GigabitEthernet0/0 eigrp router-id 1.1.1.1 ipv6 router eigrp 1 ! router-id 1.1.1.1 !passive-interface GigabitEthernet0/0 no shutdown banner motd @ Unauthorized Access is Prohibited! @ line con 0 password cisco logging synchronous line vty 0 4 password cisco login transport input all endRouter R2 Configuration:
conf t service password-encryption hostname R2 enable secret class no ip domain lookup ipv6 unicast-routing interface GigabitEthernet0/0 ip address 192.168.2.1 255.255.255.0 duplex auto speed auto ipv6 address FE80::2 link-local ipv6 address 2001:DB8:ACAD:B::2/64 ipv6 eigrp 1 ! no shutdown interface Serial0/0/0 ! bandwidth 128 ip address 192.168.12.2 255.255.255.252 ipv6 address FE80::2 link-local ipv6 address 2001:DB8:ACAD:12::2/64 ipv6 eigrp 1 no shutdown interface Serial0/0/1 bandwidth 128 ip address 192.168.23.1 255.255.255.0 !ip address 192.168.23.1 255.255.255.252 ipv6 address FE80::2 link-local ipv6 address 2001:DB8:ACAD:23::2/64 ipv6 eigrp 1 clock rate 128000 no shutdown router eigrp 1 ! network 192.168.2.0 0.0.0.255 network 192.168.12.0 0.0.0.3 network 192.168.23.0 0.0.0.3 passive-interface GigabitEthernet0/0 eigrp router-id 2.2.2.2 ipv6 router eigrp 1 ! router-id 2.2.2.2 no shutdown passive-interface GigabitEthernet0/0 banner motd @ Unauthorized Access is Prohibited! @ line con 0 password cisco login logging synchronous line vty 0 4 password cisco login transport input all end
Router R3 Configuration:
conf t service password-encryption hostname R3 enable secret class no ip domain lookup ! ipv6 unicast-routing interface GigabitEthernet0/0 ip address 192.168.3.1 255.255.255.0 duplex auto speed auto ipv6 address FE80::3 link-local ipv6 address 2001:DB8:ACAD:C::3/64 ipv6 eigrp 1 ! no shutdown interface Serial0/0/0 ! bandwidth 128 ip address 192.168.13.2 255.255.255.252 ipv6 address FE80::3 link-local ipv6 address 2001:DB8:ACAD:13::3/64 ipv6 eigrp 1 no shutdown ! clock rate 128000 interface Serial0/0/1 bandwidth 128 ip address 192.168.23.2 255.255.255.252 ipv6 address FE80::3 link-local ipv6 address 2001:DB8:ACAD:23::3/64 ipv6 eigrp 1 no shutdown router eigrp 1 network 192.168.3.0 network 192.168.13.0 0.0.0.3 ! network 192.168.23.0 0.0.0.3 passive-interface GigabitEthernet0/0 eigrp router-id 3.3.3.3 !ipv6 router eigrp 1 ! router-id 3.3.3.3 ! passive-interface GigabitEthernet0/0 ! no shutdown banner motd @ Unauthorized Access is Prohibited! @ line con 0 password cisco login logging synchronous line vty 0 4 password cisco login transport input all end
Step 4: Save the running configuration for all routers.
Part 2: Troubleshoot Layer 3 Connectivity
In Part 2, you will verify that Layer 3 connectivity is established on all interfaces. You will need to test both IPv4 and IPv6 connectivity for all device interfaces.
Note: All serial interfaces should be set with a bandwidth of 128 Kb/s. The clock rate on the DCE interface should be set to 128000.
Step 1: Verify that the interfaces listed in the Addressing Table are active and configured with correct IP address information.
a. Issue the show ip interface brief command on all routers to verify that the interfaces are in an up/up state. Record your findings. ____________________
R1 – all interfaces are up/up
R2 – G0/0 is administratively down
R3 – G0/0 is administratively down
R1# show ip interface brief
Interface IP-Address OK? Method Status Protocol
Embedded-Service-Engine0/0 unassigned YES unset administratively down down
GigabitEthernet0/0 192.168.1.1 YES manual up up
GigabitEthernet0/1 unassigned YES unset administratively down down
Serial0/0/0 192.168.21.1 YES manual up up
Serial0/0/1 192.168.13.1 YES manual up up
R2# show ip interface brief
Interface IP-Address OK? Method Status Protocol
Embedded-Service-Engine0/0 unassigned YES unset administratively down down
GigabitEthernet0/0 192.168.2.1 YES manual administratively down down
GigabitEthernet0/1 unassigned YES unset administratively down down
Serial0/0/0 192.168.12.2 YES manual up up
Serial0/0/1 192.168.23.1 YES manual up up
R3# show ip interface brief
Interface IP-Address OK? Method Status Protocol
Embedded-Service-Engine0/0 unassigned YES unset administratively down down
GigabitEthernet0/0 192.168.3.1 YES manual administratively down down
GigabitEthernet0/1 unassigned YES unset administratively down down
Serial0/0/0 192.168.13.2 YES manual up up
Serial0/0/1 192.168.23.2 YES manual up up
b. Issue the show run interface command to verify IP address assignments on all router interfaces. Compare the interface IP addresses against the Addressing Table and verify the subnet mask assignments. For IPv6, verify that the link-local address has been assigned. Record your findings. ____________________
R1 – S0/0/0 incorrect IPv4 address should be 192.168.12.1, S0/0/1 incorrect IPv6 address should be 2001:DB8:ACAD:13::1/64
R2 – S0/0/1 incorrect subnet mask should be 255.255.255.252
R3 – all IPs configured correctly
R1# show run interface s0/0/0
Building configuration...
Current configuration : 188 bytes
!
interface Serial0/0/0
bandwidth 128
ip address 192.168.21.1 255.255.255.252
ipv6 address FE80::1 link-local
ipv6 address 2001:DB8:ACAD:12::1/64
ipv6 eigrp 1
clock rate 128000
end
R1# show run interface s0/0/1
Building configuration...
Current configuration : 154 bytes
!
interface Serial0/0/1
ip address 192.168.13.1 255.255.255.252
ipv6 address FE80::1 link-local
ipv6 address 2001:DB8:ACAD:31::1/64
ipv6 eigrp 1
end
R2# show run interface s0/0/1
Building configuration...
Current configuration : 186 bytes
!
interface Serial0/0/1
bandwidth 128
ip address 192.168.23.1 255.255.255.0
ipv6 address FE80::2 link-local
ipv6 address 2001:DB8:ACAD:23::2/64
ipv6 eigrp 1
clock rate 128000
end
c. Issue the show interfaces interface-id command to verify bandwidth setting on the serial interfaces. Record your findings. ____________________
R1 – S0/0/1 incorrect bandwidth of 1544 should be 128
R2 – S0/0/0 incorrect bandwidth of 1544 should be 128
R3 – S0/0/0 incorrect bandwidth of 1544 should be 128
R1# show interfaces s0/0/1
Serial0/0/1 is up, line protocol is up
Hardware is WIC MBRD Serial
Internet address is 192.168.13.1/30
MTU 1500 bytes, BW 1544 Kbit/sec, DLY 20000 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation HDLC, loopback not set
Keepalive set (10 sec)
<output omitted>
R2# show interfaces s0/0/0
Serial0/0/0 is up, line protocol is up
Hardware is WIC MBRD Serial
Internet address is 192.168.12.2/30
MTU 1500 bytes, BW 1544 Kbit/sec, DLY 20000 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation HDLC, loopback not set
Keepalive set (10 sec)
<output omitted>
R3# show interfaces s0/0/0
Serial0/0/0 is up, line protocol is up
Hardware is WIC MBRD Serial
Internet address is 192.168.13.2/30
MTU 1500 bytes, BW 1544 Kbit/sec, DLY 20000 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation HDLC, loopback not set
Keepalive set (10 sec)
<output omitted>
d. Issue the show controllers interface-id command to verify that clock rates have been set to 128 Kb/s on all DCE serial interfaces. Issue the show interfaces interface-id command to verify bandwidth setting on the serial interfaces. Record your findings. ____________________
R1 – clock rate correctly configured on S0/0/0
R2 – clock rate correctly configured on S0/0/1
R3 – clock rate incorrectly configured 2000000 on S0/0/0 should be 128000
R3# show controllers s0/0/0
Interface Serial0/0/0
Hardware is SCC
DCE V.35, clock rate 2000000
idb at 0x30FE4FB4, driver data structure at 0x29E7C30C
wic_info 0x30FE5EC4
<output omitted>
e. Resolve all problems found. Record the commands used to correct the issues. ____________________
R1(config)# interface s0/0/0
R1(config-if)# ip address 192.168.12.1 255.255.255.252
R1(config-if)# interface s0/0/1
R1(config-if)# bandwidth 128
R1(config-if)# no ipv6 address 2001:db8:acad:31::1/64
R1(config-if)# ipv6 address 2001:db8:acad:13::1/64
R1(config-if)# end
R2(config)# interface g0/0
R2(config-if)# no shutdown
R2(config-if)# interface s0/0/0
R2(config-if)# bandwidth 128
R2(config-if)# interface s0/0/1
R2(config-if)# ip address 192.168.23.1 255.255.255.252
R2(config-if)# end
R3(config)# interface g0/0
R3(config-if)# no shutdown
R3(config-if)# interface s0/0/0
R3(config-if)# bandwidth 128
R3(config-if)# clock rate 128000
R3(config-if)# end
Step 2: Verify Layer 3 connectivity.
Use the ping command and verify that each router has network connectivity with the serial interfaces on the neighbor routers. Verify that the PCs can ping their default gateways. If problems still exist, continue troubleshooting Layer 3 issues.
Part 3: Troubleshoot EIGRP for IPv4
In Part 3, you will troubleshoot EIGRP for IPv4 problems and make the necessary changes needed to establish EIGRP for IPv4 routes and end-to-end IPv4 connectivity.
Note: LAN (G0/0) interfaces should not advertise EIGRP routing information, but routes to these networks should be contained in the routing tables.
Step 1: Test IPv4 end-to-end connectivity.
From each PC host, ping the other PC hosts in the topology to verify end-to-end connectivity.
Note: It may be necessary to disable the PC firewall before testing, to ping between PCs.
a. Ping from PC-A to PC-B. Were the pings successful? ________No
b. Ping from PC-A to PC-C. Were the pings successful? ________Yes
c. Ping from PC-B to PC-C. Were the pings successful? ________No
Step 2: Verify that all interfaces are assigned to EIGRP for IPv4.
a. Issue the show ip protocols command to verify that EIGRP is running and that all networks are advertised. This command also allows you to verify that the router ID is set correctly, and that the LAN interfaces are set as passive interfaces. Record your findings. ____________________
R1 – router ID, advertised networks, and passive interface are all configure correctly
R2 – router ID is correct, network statement missing for 192.168.2.0 and g0/0 not set to passive
R3 – router ID and passive interface are configured correctly, network statement missing for 192.168.23.0
R1# show ip protocols
*** IP Routing is NSF aware ***
Routing Protocol is "eigrp 1"
Outgoing update filter list for all interfaces is not set
Incoming update filter list for all interfaces is not set
Default networks flagged in outgoing updates
Default networks accepted from incoming updates
EIGRP-IPv4 Protocol for AS(1)
Metric weight K1=1, K2=0, K3=1, K4=0, K5=0
NSF-aware route hold timer is 240
Router-ID: 1.1.1.1
Topology : 0 (base)
Active Timer: 3 min
Distance: internal 90 external 170
Maximum path: 4
Maximum hopcount 100
Maximum metric variance 1
Automatic Summarization: disabled
Maximum path: 4
Routing for Networks:
192.168.1.0
192.168.12.0/30
192.168.13.0/30
Passive Interface(s):
GigabitEthernet0/0
Routing Information Sources:
Gateway Distance Last Update
192.168.12.2 90 00:19:19
192.168.13.2 90 00:19:20
Distance: internal 90 external 170
R2# show ip protocols
*** IP Routing is NSF aware ***
Routing Protocol is "eigrp 1"
Outgoing update filter list for all interfaces is not set
Incoming update filter list for all interfaces is not set
Default networks flagged in outgoing updates
Default networks accepted from incoming updates
EIGRP-IPv4 Protocol for AS(1)
Metric weight K1=1, K2=0, K3=1, K4=0, K5=0
NSF-aware route hold timer is 240
Router-ID: 2.2.2.2
Topology : 0 (base)
Active Timer: 3 min
Distance: internal 90 external 170
Maximum path: 4
Maximum hopcount 100
Maximum metric variance 1
Automatic Summarization: disabled
Maximum path: 4
Routing for Networks:
192.168.12.0/30
192.168.23.0/30
Routing Information Sources:
Gateway Distance Last Update
192.168.12.1 90 00:13:23
Distance: internal 90 external 170
R3# sh ip protocols
*** IP Routing is NSF aware ***
Routing Protocol is "eigrp 1"
Outgoing update filter list for all interfaces is not set
Incoming update filter list for all interfaces is not set
Default networks flagged in outgoing updates
Default networks accepted from incoming updates
EIGRP-IPv4 Protocol for AS(1)
Metric weight K1=1, K2=0, K3=1, K4=0, K5=0
NSF-aware route hold timer is 240
Router-ID: 3.3.3.3
Topology : 0 (base)
Active Timer: 3 min
Distance: internal 90 external 170
Maximum path: 4
Maximum hopcount 100
Maximum metric variance 1
Automatic Summarization: disabled
Maximum path: 4
Routing for Networks:
192.168.3.0
192.168.13.0/30
Passive Interface(s):
GigabitEthernet0/0
Routing Information Sources:
Gateway Distance Last Update
192.168.13.1 90 00:14:25
Distance: internal 90 external 170
b. Make the necessary changes based on the output from the show ip protocols command. Record the commands that were used to correct the issues. ____________________
R2(config)# router eigrp 1
R2(config-router)# network 192.168.2.0 0.0.0.255
R2(config-router)# passive-interface g0/0
R2(config-router)# end
R3(config)# router eigrp 1
R3(config-router)# network 192.168.23.0 0.0.0.3
R3(config-router)# end
c. Re-issue the show ip protocols command to verify that your changes had the desired effect.
Step 3: Verify EIGRP neighbor information.
a. Issue the show ip eigrp neighbor command to verify that EIGRP adjacencies have been established between the neighboring routers.
R1# show ip eigrp neighbor
EIGRP-IPv4 Neighbors for AS(1)
H Address Interface Hold Uptime SRTT RTO Q Seq
(sec) (ms) Cnt Num
1 192.168.12.2 Se0/0/0 10 00:27:21 5 1170 0 12
0 192.168.13.2 Se0/0/1 12 00:47:18 1 1140 0 13
R2# show ip eigrp neighbor
EIGRP-IPv4 Neighbors for AS(1)
H Address Interface Hold Uptime SRTT RTO Q Seq
(sec) (ms) Cnt Num
1 192.168.23.2 Se0/0/1 10 00:06:54 18 1170 0 14
0 192.168.12.1 Se0/0/0 11 00:30:35 6 1200 0 20
R3# show ip eigrp neighbor
EIGRP-IPv4 Neighbors for AS(1)
H Address Interface Hold Uptime SRTT RTO Q Seq
(sec) (ms) Cnt Num
1 192.168.23.1 Se0/0/1 14 00:07:23 16 1170 0 13
0 192.168.13.1 Se0/0/0 13 00:51:01 2 1140 0 21
b. Resolve any outstanding problems that were discovered.
Instructor Note: All problems were resolved in Step 2b.
Step 4: Verify EIGRP for IPv4 routing information.
a. Issue the show ip route eigrp command to verify that each router has EIGRP for IPv4 routes to all nonadjoining networks.
R1# show ip route eigrp
Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2
i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
ia - IS-IS inter area, * - candidate default, U - per-user static route
o - ODR, P - periodic downloaded static route, H - NHRP, l - LISP
+ - replicated route, % - next hop override
Gateway of last resort is not set
D 192.168.2.0/24 [90/20514560] via 192.168.12.2, 01:04:13, Serial0/0/0
D 192.168.3.0/24 [90/20514560] via 192.168.13.2, 01:04:13, Serial0/0/1
192.168.23.0/30 is subnetted, 1 subnets
D 192.168.23.0 [90/21024000] via 192.168.13.2, 01:04:14, Serial0/0/1
[90/21024000] via 192.168.12.2, 01:04:14, Serial0/0/0
R2# show ip route eigrp
Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2
i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
ia - IS-IS inter area, * - candidate default, U - per-user static route
o - ODR, P - periodic downloaded static route, H - NHRP, l - LISP
+ - replicated route, % - next hop override
Gateway of last resort is not set
D 192.168.1.0/24 [90/20514560] via 192.168.12.1, 01:04:42, Serial0/0/0
D 192.168.3.0/24 [90/20514560] via 192.168.23.2, 01:04:42, Serial0/0/1
192.168.13.0/30 is subnetted, 1 subnets
D 192.168.13.0 [90/21024000] via 192.168.23.2, 01:04:42, Serial0/0/1
[90/21024000] via 192.168.12.1, 01:04:42, Serial0/0/0
R3# show ip route eigrp
Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2
i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
ia - IS-IS inter area, * - candidate default, U - per-user static route
o - ODR, P - periodic downloaded static route, H - NHRP, l - LISP
+ - replicated route, % - next hop override
Gateway of last resort is not set
D 192.168.1.0/24 [90/20514560] via 192.168.13.1, 01:05:07, Serial0/0/0
D 192.168.2.0/24 [90/20514560] via 192.168.23.1, 01:05:07, Serial0/0/1
192.168.12.0/30 is subnetted, 1 subnets
D 192.168.12.0 [90/21024000] via 192.168.23.1, 01:05:07, Serial0/0/1
[90/21024000] via 192.168.13.1, 01:05:07, Serial0/0/0
Are all EIGRP routes available? ______yes
If any EIGRP for IPv4 routes are missing, what is missing? ____________________
All EIGRP routes are present.
b. If any routing information is missing, resolve these issues.
Instructor Note: All problems should have been resolved.
Step 5: Verify IPv4 end-to-end connectivity.
From each PC, verify that IPv4 end-to-end connectivity exists. PCs should be able to ping the other PC hosts in the topology. If IPv4 end-to-end connectivity does not exist, then continue troubleshooting to resolve remaining issues.
Note: It may be necessary to disable the PCs firewall.
Part 4: Troubleshoot EIGRP for IPv6
In Part 3, you will troubleshoot EIGRP for IPv6 problems and make the necessary changes needed to establish EIGRP for IPv6 routes and end-to-end IPv6 connectivity.
Note: LAN (G0/0) interfaces should not advertise EIGRP routing information, but routes to these networks should be contained in the routing tables.
Step 1: Test IPv6 end-to-end connectivity.
From each PC host, ping the IPv6 addresses of the other PC hosts in the topology to verify end-to-end connectivity.
Step 2: Verify that IPv6 unicast routing has been enabled on all routers.
a. An easy way to verify that IPv6 routing has been enabled on a router is to use the show run | section ipv6 unicast command. By adding this pipe to the show run command, the ipv6 unicast-routing command is displayed if IPv6 routing has been enabled.
Note: The show run command can also be issued without any pipe, and then a manual search for the ipv6 unicast-routing command can be done.
Issue the command on each router. Record your findings. ____________________
R3 does not have IPv6 unicast routing enabled.
b. If IPv6 unicast routing is not enabled on one or more routers, enable it now. Record the commands that were used to correct the issues. ____________________
R3(config)# ipv6 unicast-routing
Step 3: Verify that all interfaces are assigned to EIGRP for IPv6.
a. Issue the show ipv6 protocols command and verify that the router ID is correct. This command also allows you to verify that the LAN interfaces are set as passive interfaces.
Note: If no output is generated from this command, then the EIGRP for IPv6 process has not been configured.
Record your findings. ____________________
R1 – router ID is incorrect.and g0/0 not set to passive interface
R2 – router ID is incorrect
R3 – EIGRP had not been configured on this router
R1# show ipv6 protocols
IPv6 Routing Protocol is "connected"
IPv6 Routing Protocol is "ND"
IPv6 Routing Protocol is "eigrp 1"
EIGRP-IPv6 Protocol for AS(1)
Metric weight K1=1, K2=0, K3=1, K4=0, K5=0
NSF-aware route hold timer is 240
Router-ID: 192.168.21.1
Topology : 0 (base)
Active Timer: 3 min
Distance: internal 90 external 170
Maximum path: 16
Maximum hopcount 100
Maximum metric variance 1
Interfaces:
Serial0/0/0
Serial0/0/1
GigabitEthernet0/0
Redistribution:
None
R2# show ipv6 protocols
IPv6 Routing Protocol is "connected"
IPv6 Routing Protocol is "ND"
IPv6 Routing Protocol is "eigrp 1"
EIGRP-IPv6 Protocol for AS(1)
Metric weight K1=1, K2=0, K3=1, K4=0, K5=0
NSF-aware route hold timer is 240
Router-ID: 192.168.23.1
Topology : 0 (base)
Active Timer: 3 min
Distance: internal 90 external 170
Maximum path: 16
Maximum hopcount 100
Maximum metric variance 1
Interfaces:
Serial0/0/0
Serial0/0/1
GigabitEthernet0/0 (passive)
Redistribution:
None
R3# show ipv6 protocols
IPv6 Routing Protocol is "connected"
IPv6 Routing Protocol is "ND"
b. Make the necessary configuration changes. Record the commands used to correct the issues. ____________________
R1(config)# ipv6 router eigrp 1
R1(config-rtr)# router-id 1.1.1.1
R1(config-rtr)# passive-interface g0/0
R2(config-rtr)# end
R2(config)# ipv6 router eigrp 1
R2(config-rtr)# router-id 2.2.2.2
R2(config-rtr)# end
R3(config)# ipv6 router eigrp 1
R3(config-rtr)# router-id 3.3.3.3
R3(config-rtr)# passive-interface g0/0
R3(config-rtr)# no shutdown
R3(config-rtr)# interface g0/0
R3(config-if)# ipv6 eigrp 1
R3(config-if)# interface s0/0/0
R3(config-if)# ipv6 eigrp 1
R3(config-if)# interface s0/0/1
R3(config-if)# ipv6 eigrp 1
R3(config-if)# end
c. Re-issue the show ipv6 protocols command to verify that your changes are correct.
Step 4: Verify that all routers have correct neighbor adjacency information.
a. Issue the show ipv6 eigrp neighbor command to verify that adjacencies have formed between neighboring routers.
R1# show ipv6 eigrp neighbors
EIGRP-IPv6 Neighbors for AS(1)
H Address Interface Hold Uptime SRTT RTO Q Seq
(sec) (ms) Cnt Num
1 Link-local address: Se0/0/1 13 00:13:38 17 1182 0 7
FE80::3
0 Link-local address: Se0/0/0 14 00:17:30 16 1182 0 20
FE80::2
R2# show ipv6 eigrp neighbors
EIGRP-IPv6 Neighbors for AS(1)
H Address Interface Hold Uptime SRTT RTO Q Seq
(sec) (ms) Cnt Num
1 Link-local address: Se0/0/1 13 00:14:36 27 1182 0 8
FE80::3
0 Link-local address: Se0/0/0 12 00:18:33 17 1182 0 22
FE80::1
R3# show ipv6 eigrp neighbors
EIGRP-IPv6 Neighbors for AS(1)
H Address Interface Hold Uptime SRTT RTO Q Seq
(sec) (ms) Cnt Num
1 Link-local address: Se0/0/1 12 00:07:39 24 1182 0 21
FE80::2
0 Link-local address: Se0/0/0 12 00:07:44 19 1182 0 21
FE80::1
b. Resolve any EIGRP adjacency issues that still exist.
Instructor Note: All adjacency issues should have been resolved in earlier steps.
Step 5: Verify EIGRP for IPv6 routing information.
a. Issue the show ipv6 route eigrp command, and verify that EIGRP for IPv6 routes exist to all non-adjoining networks.
R1# show ipv6 route eigrp
IPv6 Routing Table - default - 10 entries
Codes: C - Connected, L - Local, S - Static, U - Per-user Static route
B - BGP, R - RIP, I1 - ISIS L1, I2 - ISIS L2
IA - ISIS interarea, IS - ISIS summary, D - EIGRP, EX - EIGRP external
ND - ND Default, NDp - ND Prefix, DCE - Destination, NDr - Redirect
O - OSPF Intra, OI - OSPF Inter, OE1 - OSPF ext 1, OE2 - OSPF ext 2
ON1 - OSPF NSSA ext 1, ON2 - OSPF NSSA ext 2
D 2001:DB8:ACAD:B::/64 [90/20514560]
via FE80::2, Serial0/0/0
D 2001:DB8:ACAD:C::/64 [90/20514560]
via FE80::3, Serial0/0/1
D 2001:DB8:ACAD:23::/64 [90/21024000]
via FE80::2, Serial0/0/0
via FE80::3, Serial0/0/1
R2# show ipv6 route eigrp
IPv6 Routing Table - default - 10 entries
Codes: C - Connected, L - Local, S - Static, U - Per-user Static route
B - BGP, R - RIP, I1 - ISIS L1, I2 - ISIS L2
IA - ISIS interarea, IS - ISIS summary, D - EIGRP, EX - EIGRP external
ND - ND Default, NDp - ND Prefix, DCE - Destination, NDr - Redirect
O - OSPF Intra, OI - OSPF Inter, OE1 - OSPF ext 1, OE2 - OSPF ext 2
ON1 - OSPF NSSA ext 1, ON2 - OSPF NSSA ext 2
D 2001:DB8:ACAD:A::/64 [90/20514560]
via FE80::1, Serial0/0/0
D 2001:DB8:ACAD:C::/64 [90/20514560]
via FE80::3, Serial0/0/1
D 2001:DB8:ACAD:13::/64 [90/21024000]
via FE80::1, Serial0/0/0
via FE80::3, Serial0/0/1
R3# show ipv6 route eigrp
IPv6 Routing Table - default - 10 entries
Codes: C - Connected, L - Local, S - Static, U - Per-user Static route
B - BGP, R - RIP, I1 - ISIS L1, I2 - ISIS L2
IA - ISIS interarea, IS - ISIS summary, D - EIGRP, EX - EIGRP external
ND - ND Default, NDp - ND Prefix, DCE - Destination, NDr - Redirect
O - OSPF Intra, OI - OSPF Inter, OE1 - OSPF ext 1, OE2 - OSPF ext 2
ON1 - OSPF NSSA ext 1, ON2 - OSPF NSSA ext 2
D 2001:DB8:ACAD:A::/64 [90/20514560]
via FE80::1, Serial0/0/0
D 2001:DB8:ACAD:B::/64 [90/20514560]
via FE80::2, Serial0/0/1
D 2001:DB8:ACAD:12::/64 [90/21024000]
via FE80::1, Serial0/0/0
via FE80::2, Serial0/0/1
Are all EIGRP routes available? _____yes
If any EIGRP for IPv6 routes are missing, what is missing? ____________________
All EIGRP for IPv6 routes are present.
b. Resolve any routing issues that still exist.
Instructor Note: All EIGRP for IPv6 routes issues should have been resolved.
Step 6: Test IPv6 end-to-end connectivity.
From each PC, verify that IPv6 end-to-end connectivity exists. PCs should be able to ping the other PC hosts in the topology. If IPv6 end-to-end connectivity does not exist, then continue troubleshooting to resolve remaining issues.
Note: It may be necessary to disable the PCs firewall.
Reflection
Why would you troubleshoot EIGRP for IPv4 and EIGRP for IPv6 separately? ____________________
EIGRP for IPv4 and EIGRP for IPv6 do not share routing information and their configuration is completely independent. Troubleshooting these two protocols should be done independently.
Router Interface Summary Table
| Router Interface Summary | ||||
|---|---|---|---|---|
| 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) |
| 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. | ||||
Device Configs – Final
R1#show run Building configuration... Current configuration : 1937 bytes ! version 15.2 service timestamps debug datetime msec service timestamps log datetime msec service password-encryption ! hostname R1 ! boot-start-marker boot-end-marker ! enable secret 4 06YFDUHH61wAE/kLkDq9BGho1QM5EnRtoyr8cHAUg.2 ! no aaa new-model memory-size iomem 15 ! ip cef ! no ip domain lookup ipv6 unicast-routing ipv6 cef multilink bundle-name authenticated ! interface Embedded-Service-Engine0/0 no ip address shutdown ! interface GigabitEthernet0/0 ip address 192.168.1.1 255.255.255.0 duplex auto speed auto ipv6 address FE80::1 link-local ipv6 address 2001:DB8:ACAD:A::1/64 ipv6 eigrp 1 ! interface GigabitEthernet0/1 no ip address shutdown duplex auto speed auto ! interface Serial0/0/0 bandwidth 128 ip address 192.168.12.1 255.255.255.252 ipv6 address FE80::1 link-local ipv6 address 2001:DB8:ACAD:12::1/64 ipv6 eigrp 1 clock rate 128000 ! interface Serial0/0/1 bandwidth 128 ip address 192.168.13.1 255.255.255.252 ipv6 address FE80::1 link-local ipv6 address 2001:DB8:ACAD:13::1/64 ipv6 eigrp 1 ! router eigrp 1 network 192.168.1.0 network 192.168.12.0 0.0.0.3 network 192.168.13.0 0.0.0.3 passive-interface GigabitEthernet0/0 eigrp router-id 1.1.1.1 ! ip forward-protocol nd ! no ip http server no ip http secure-server ! ipv6 router eigrp 1 passive-interface GigabitEthernet0/0 eigrp router-id 1.1.1.1 ! control-plane ! banner motd ^C Unauthorized Access is Prohibited! ^C ! line con 0 password 7 13061E010803 login logging synchronous line aux 0 line 2 no activation-character no exec transport preferred none transport input all transport output pad telnet rlogin lapb-ta mop udptn v120 ssh stopbits 1 line vty 0 4 password 7 060506324F41 login transport input all ! scheduler allocate 20000 1000 ! end
R2# show run Building configuration... Current configuration : 1937 bytes ! version 15.2 service timestamps debug datetime msec service timestamps log datetime msec service password-encryption ! hostname R2 ! boot-start-marker boot-end-marker ! enable secret 4 06YFDUHH61wAE/kLkDq9BGho1QM5EnRtoyr8cHAUg.2 ! no aaa new-model memory-size iomem 15 ! ip cef ! no ip domain lookup ipv6 unicast-routing ipv6 cef multilink bundle-name authenticated ! interface Embedded-Service-Engine0/0 no ip address shutdown ! interface GigabitEthernet0/0 ip address 192.168.2.1 255.255.255.0 duplex auto speed auto ipv6 address FE80::2 link-local ipv6 address 2001:DB8:ACAD:B::2/64 ipv6 eigrp 1 ! interface GigabitEthernet0/1 no ip address shutdown duplex auto speed auto ! interface Serial0/0/0 bandwidth 128 ip address 192.168.12.2 255.255.255.252 ipv6 address FE80::2 link-local ipv6 address 2001:DB8:ACAD:12::2/64 ipv6 eigrp 1 ! interface Serial0/0/1 bandwidth 128 ip address 192.168.23.1 255.255.255.252 ipv6 address FE80::2 link-local ipv6 address 2001:DB8:ACAD:23::2/64 ipv6 eigrp 1 clock rate 128000 ! router eigrp 1 network 192.168.2.0 network 192.168.12.0 0.0.0.3 network 192.168.23.0 0.0.0.3 passive-interface GigabitEthernet0/0 eigrp router-id 2.2.2.2 ! ip forward-protocol nd ! no ip http server no ip http secure-server ! ipv6 router eigrp 1 passive-interface GigabitEthernet0/0 eigrp router-id 2.2.2.2 ! control-plane ! banner motd ^C Unauthorized Access is Prohibited! ^C ! line con 0 password 7 13061E010803 login logging synchronous line aux 0 line 2 no activation-character no exec transport preferred none transport input all transport output pad telnet rlogin lapb-ta mop udptn v120 ssh stopbits 1 line vty 0 4 password 7 070C285F4D06 login transport input all ! scheduler allocate 20000 1000 ! end
R3# show run Building configuration... Current configuration : 1976 bytes ! version 15.2 service timestamps debug datetime msec service timestamps log datetime msec service password-encryption ! hostname R3 ! boot-start-marker boot-end-marker ! enable secret 4 06YFDUHH61wAE/kLkDq9BGho1QM5EnRtoyr8cHAUg.2 ! no aaa new-model memory-size iomem 15 ! ip cef ! no ip domain lookup ipv6 unicast-routing ipv6 cef multilink bundle-name authenticated ! interface Embedded-Service-Engine0/0 no ip address shutdown ! interface GigabitEthernet0/0 ip address 192.168.3.1 255.255.255.0 duplex auto speed auto ipv6 address FE80::3 link-local ipv6 address 2001:DB8:ACAD:C::3/64 ipv6 eigrp 1 ! interface GigabitEthernet0/1 no ip address shutdown duplex auto speed auto ! interface Serial0/0/0 bandwidth 128 ip address 192.168.13.2 255.255.255.252 ipv6 address FE80::3 link-local ipv6 address 2001:DB8:ACAD:13::3/64 ipv6 eigrp 1 clock rate 128000 ! interface Serial0/0/1 bandwidth 128 ip address 192.168.23.2 255.255.255.252 ipv6 address FE80::3 link-local ipv6 address 2001:DB8:ACAD:23::3/64 ipv6 eigrp 1 ! router eigrp 1 network 192.168.3.0 network 192.168.13.0 0.0.0.3 network 192.168.23.0 0.0.0.3 passive-interface GigabitEthernet0/0 eigrp router-id 3.3.3.3 ! ip forward-protocol nd ! no ip http server no ip http secure-server ! ipv6 router eigrp 1 passive-interface GigabitEthernet0/0 eigrp router-id 3.3.3.3 ! control-plane ! banner motd ^C Unauthorized Access is Prohibited! ^C ! line con 0 password 7 13061E010803 login logging synchronous line aux 0 line 2 no activation-character no exec transport preferred none transport input all transport output pad telnet rlogin lapb-ta mop udptn v120 ssh stopbits 1 line vty 0 4 password 7 13061E010803 login transport input all ! scheduler allocate 20000 1000 ! end
