EIGRP CCNA CCNP LAB

In this lab, we see the configuration of EIGRP Redistribution OSPF EIGRP Authentication EIGRP STUB Summary and more. This lab is good for CCNA and CCNP students. let's see what we are going to configure:-

EIGRP is a classless, distance vector routing protocol that uses the concept of an autonomous system to describe a set of contiguous routers that run the same routing protocol and share routing information, including subnet mask in its route updates. EIGRP is sometimes called a hybrid routing protocol or an advanced distance vector protocol because is has characteristics of both distance-vector some link-state protocols. For example, EIGRP doesn't send link-state packets like OSPF does. instead, it is traditional distance-vector updates that include information about networks plus the cost of reaching them from the perspective of the advertising router.

Route Summarization is the process of combining the contagious networks into one sub-large network. Route summarization also called route aggregation, route summarization helps to minimize the routing table in an IP network, summarization uses fewer resources like memory, processor, and bandwidth.

Route redistribution is when we take a route from one routing protocol and inject that route or distribute it into another routing protocol. Routers by default only advertise and share routing information with other routers running the same protocol and in the same AS. If you have 2 routers and one runs EIGRP and the other runs OSPF and you want them to know about each other’s routes, by default, routers do not share route information because they are not running the same protocol. Here we need redistribution.

EIGRP STUB Stub routing is one way to limit queries. A stub router is one that is connected to more than two neighbors and should be a transit router. The EIGRP stub routing feature improves network stability, reduces resource utilization, and simplifies remote router (spoke) configuration. Stub routing is commonly used in a Hub-and-Spoke topology.

EIGRP Passive interface does not send any hello messages on a passive interface. EIGRP router ignores any EIGRP messages received on the interface which means no neighbor relation but EIGRP still advertises about the connected subnet only if matched with an EIGRP network command.

Routing Protocol Authentication (EIGRP ) A router authenticates the source of each routing update packet that it receives. Many routing protocols support authentication like OSPF, EIGRP, ISIS, BGP, and RIPv2.Cisco routers support different approaches to authentication route advertisements received from a neighboring router:

Plain text authentication
Hashing authentication (using MD5)

configure the topology as per the diagram
configure the IP addresses as per the topology
configure OSPF on routers 10 and 12
advertise loopbacks
configure EIGRP 100 advertise directly connected
configure EIGRP authentication AS 100
configure redistribution on router 5
configure EIGRP stub
configure EIGRP passive interface

R1(config)#interface serial 5/0
R1(config-if)#ip address 12.1.1.1 255.0.0.0
R1(config-if)#no shutdown
R1(config-if)#exit
R1(config)#interface serial 5/3
R1(config-if)#ip address 41.1.1.2 255.0.0.0
R1(config-if)#no shutdown
R1(config-if)#exit
R1(config)#interface serial 6/0
R1(config-if)#ip address 15.1.1.1 255.0.0.0
R1(config-if)#no shutdown
R1(config-if)#exit

R1#show ip interface brief

Interface IP-Address OK? Method Status Protocol

Serial5/0 12.1.1.1 YES manual up up

Serial5/3 41.1.1.2 YES manual up up

Serial6/0 15.1.1.1 YES manual up up

R2(config)#interface serial 5/0
R2(config-if)#ip address 12.1.1.2 255.0.0.0
R2(config-if)#no shutdown
R2(config-if)#exit
R2(config)#interface serial 5/1
R2(config-if)#ip address 23.1.1.1 255.0.0.0
R2(config-if)#no shutdown
R2(config-if)#exit
R2(config)#interface serial 6/1
R2(config-if)#ip address 26.1.1.1 255.0.0.0
R2(config-if)#no shutdown
R2(config-if)#exit

R2#show ip interface brief

Interface IP-Address OK? Method Status Protocol

Serial5/0 12.1.1.2 YES manual up up

Serial5/1 23.1.1.1 YES manual up up

Serial6/1 26.1.1.1 YES manual up up

R3(config)#interface serial 5/1
R3(config-if)#ip address 23.1.1.2 255.0.0.0
R3(config-if)#no shutdown
R3(config-if)#exit
R3(config)#interface serial 5/2
R3(config-if)#ip address 34.1.1.1 255.0.0.0
R3(config-if)#no shutdown
R3(config-if)#exit
R3(config)#interface serial 6/2
R3(config-if)#ip address 37.1.1.1 255.0.0.0
R3(config-if)#no shutdown
R3(config-if)#exit

R3#show ip interface brief

Interface IP-Address OK? Method Status Protocol

Serial5/1 23.1.1.2 YES manual up up

Serial5/2 34.1.1.1 YES manual up up

Serial6/2 37.1.1.1 YES manual up up

R4(config)#interface serial 5/3
R4(config-if)#ip address 43.1.1.1 255.0.0.0
R4(config-if)#no shutdown
R4(config-if)#exit
R4(config)#interface serial 5/2
R4(config-if)#ip address 34.1.1.2 255.0.0.0
R4(config-if)#no shutdown
R4(config-if)#exit
R4(config)#interface serial 6/3
R4(config-if)#ip address 48.1.1.1 255.0.0.0
R4(config-if)#no shutdown
R4(config-if)#exit

R4#show ip interface brief

Interface IP-Address OK? Method Status Protocol

Serial5/2 34.1.1.2 YES manual up up

Serial5/3 41.1.1.1 YES manual up up

Serial6/3 48.1.1.1 YES manual up up

R5(config)#interface serial 6/0
R5(config-if)#ip address 15.1.1.2 255.0.0.0
R5(config-if)#no shutdown
R5(config-if)#exit
R5(config)#interface serial 6/1
R5(config-if)#ip address 55.1.1.1 255.0.0.0
R5(config-if)#no shutdown
R5(config-if)#exit
R5(config)#interface serial 6/2
R5(config-if)#ip address 51.1.1.1 255.0.0.0
R5(config-if)#no shutdown
R5(config-if)#exit

R5#show ip interface brief

Interface IP-Address OK? Method Status Protocol

Serial6/0 15.1.1.2 YES manual up up

Serial6/1 55.1.1.1 YES manual up up

Serial6/2 51.1.1.1 YES manual up up

R6(config)#interface serial 6/1
R6(config-if)#ip address 26.1.1.2 255.0.0.0
R6(config-if)#no shutdown
R6(config-if)#exit
R6(config)#interface loopback 1
R6(config-if)#ip address 192.168.61.1 255.255.255.0
R6(config-if)#exit
R6(config)#interface loopback 2
R6(config-if)#ip address 192.168.62.2 255.255.255.0
R6(config-if)#exit
R6(config)#interface loopback 3
R6(config-if)#ip address 192.168.63.3 255.255.255.0
R6(config-if)#exit
R6(config)#interface loopback 4
R6(config-if)#ip address 192.168.64.4 255.255.255.0
R6(config-if)#exit

R7(config)#interface serial 6/2
R7(config-if)#ip address 37.1.1.2 255.0.0.0
R7(config-if)#no shutdown
R7(config-if)#exit
R7(config)#interface serial 6/4
R7(config-if)#ip address 79.1.1.1 255.0.0.0
R7(config-if)#no shutdown
R7(config-if)#exit
R7(config)#interface serial 6/3
R7(config-if)#ip address 71.1.1.1 255.0.0.0
R7(config-if)#ip address 71.1.1.1 255.0.0.0
R7(config-if)#no shutdown
R7(config-if)#exit

R7#show ip interface brief

Interface IP-Address OK? Method Status Protocol

Serial6/2 37.1.1.2 YES manual up up

Serial6/3 71.1.1.1 YES manual up up

Serial6/4 79.1.1.1 YES manual up up

R8(config)#interface serial 6/3
R8(config-if)#ip address 48.1.1.2 255.0.0.0
R8(config-if)#no shutdown
R8(config-if)#exit
R8(config)#interface loopback 1
R8(config-if)#ip address 192.168.81.1 255.255.255.0
R8(config-if)#exit
R8(config)#interface loopback 2
R8(config-if)#ip address 192.168.82.2 255.255.255.0
R8(config-if)#exit
R8(config)#interface loopback 3
R8(config-if)#ip address 192.168.83.3 255.255.255.0
R8(config-if)#exit
R8(config)#interface loopback 4
R8(config-if)#ip address 192.168.84.4 255.255.255.0
R8(config-if)#exit

R8(config)#interface fastethernet 0/0
R8(config-if)#ip address 80.1.1.1 255.0.0.0
R8(config-if)#no shutdown
R8(config-if)#no keepalive
R8(config-if)#exit
R8(config)#interface fastethernet 2/0
R8(config-if)#ip address 81.1.2.1 255.0.0.0
R8(config-if)#no shutdown
R8(config-if)#no keepalive
R8(config-if)#exit
R8(config)#interface fastethernet 3/0
R8(config-if)#ip address 82.1.3.1 255.0.0.0
R8(config-if)#no shutdown
R8(config-if)#no keepalive
R8(config-if)#exit
R8(config)#interface fastethernet 3/1
R8(config-if)#ip address 83.1.4.1 255.0.0.0
R8(config-if)#no shutdown
R8(config-if)#no keepalive
R8(config-if)#exit

R8#show ip interface brief

Interface IP-Address OK? Method Status Protocol

FastEthernet0/0 80.1.1.1 YES manual up up

FastEthernet2/0 81.1.2.1 YES manual up up

FastEthernet3/0 82.1.3.1 YES manual up up

FastEthernet3/1 83.1.4.1 YES manual up up

Serial6/3 48.1.1.2 YES manual up up

Loopback1 192.168.81.1 YES manual up up

Loopback2 192.168.82.2 YES manual up up

Loopback3 192.168.83.3 YES manual up up

Loopback4 192.168.84.4 YES manual up up

R9(config)#interface serial 6/4
R9(config-if)#ip address 79.1.1.2 255.0.0.0
R9(config-if)#no shutdown
R9(config-if)#exit
R9(config)#interface loopback 1
R9(config-if)#ip address 192.168.91.1 255.255.255.0
R9(config-if)#exit
R9(config)#interface loopback 2
R9(config-if)#ip address 192.168.92.2 255.255.255.0
R9(config-if)#exit
R9(config)#interface loopback 3
R9(config-if)#ip address 192.168.93.3 255.255.255.0
R9(config-if)#exit
R9(config)#interface loopback 4
R9(config-if)#ip address 192.168.94.4 255.255.255.0
R9(config-if)#exit

R9#show ip interface brief

Interface IP-Address OK? Method Status Protocol

Serial6/4 79.1.1.2 YES manual up up

Loopback1 192.168.91.1 YES manual up up

Loopback2 192.168.92.2 YES manual up up

Loopback3 192.168.93.3 YES manual up up

Loopback4 192.168.94.4 YES manual up up

R10(config)#interface serial 6/2
R10(config-if)#ip address 51.1.1.2 255.0.0.0
R10(config-if)#no shutdown
R10(config-if)#exit
R10(config)#interface serial 6/2
R10(config-if)#ip address 51.1.1.2 255.0.0.0
R10(config-if)#no shutdown
R10(config-if)#exit

R10(config)#interface loopback 1
R10(config-if)#ip address 192.168.101.1 255.255.255.0
R10(config-if)#exit
R10(config)#interface loopback 2
R10(config-if)#ip address 192.168.102.2 255.255.255.0
R10(config-if)#exit
R10(config)#interface loopback 3
R10(config-if)#ip address 192.168.103.3 255.255.255.0
R10(config-if)#exit
R10(config)#interface loopback 4
R10(config-if)#ip address 192.168.104.4 255.255.255.0
R10(config-if)#exit

R10#show ip interface brief

Interface IP-Address OK? Method Status Protocol

Serial6/2 51.1.1.2 YES manual up up

Loopback1 192.168.101.1 YES manual up up

Loopback2 192.168.102.2 YES manual up up

Loopback3 192.168.103.3 YES manual up up

Loopback4 192.168.104.4 YES manual up up

R11(config)#interface serial 6/3
R11(config-if)#ip address 71.1.1.2 255.0.0.0
R11(config-if)#no shutdown
R11(config-if)#exit
R11(config)#interface loopback 1
R11(config-if)#ip address 192.168.11.1 255.255.255.0
R11(config-if)#exit
R11(config)#interface loopback 2
R11(config-if)#ip address 192.168.12.2 255.255.255.0
R11(config-if)#exit
R11(config)#interface loopback 3
R11(config-if)#ip address 192.168.13.3 255.255.255.0
R11(config-if)#exit
R11(config)#interface loopback 4
R11(config-if)#ip address 192.168.14.4 255.255.255.0
R11(config-if)#exit

R11#show ip interface brief

Interface IP-Address OK? Method Status Protocol

Serial6/3 71.1.1.2 YES manual up up

Loopback1 192.168.11.1 YES manual up up

Loopback2 192.168.12.2 YES manual up up

Loopback3 192.168.13.3 YES manual up up

Loopback4 192.168.14.4 YES manual up up

R12(config)#interface serial 6/1
R12(config-if)#ip address 55.1.1.2 255.0.0.0
R12(config-if)#no shutdown
R12(config-if)#exit

R12(config)#interface loopback 1
R12(config-if)#ip address 192.168.112.1 255.255.255.0
R12(config-if)#exit
R12(config)#interface loopback 2
R12(config-if)#ip address 192.168.123.2 255.255.255.0
R12(config-if)#exit
R12(config)#interface loopback 3
R12(config-if)#ip address 192.168.124.3 255.255.255.0
R12(config-if)#exit
R12(config)#interface loopback 4
R12(config-if)#ip address 192.168.125.4 255.255.255.0
R12(config-if)#exit

R12#show ip interface brief

Interface IP-Address OK? Method Status Protocol

Serial6/1 55.1.1.2 YES manual up up

Loopback1 192.168.112.1 YES manual up up

Loopback2 192.168.123.2 YES manual up up

Loopback3 192.168.124.3 YES manual up up

Loopback4 192.168.125.4 YES manual up up

R1(config)#router eigrp 100
R1(config-router)#network 12.0.0.0
R1(config-router)#network 41.0.0.0
R1(config-router)#network 15.0.0.0
R1(config-router)#exit

R2(config)#router eigrp 100
R2(config-router)#network 12.0.0.0
R2(config-router)#network 23.0.0.0
R2(config-router)#network 26.0.0.0
R2(config-router)#exit

R3(config)#router eigrp 100
R3(config-router)#network 23.0.0.0
R3(config-router)#network 34.0.0.0
R3(config-router)#network 37.0.0.0
R3(config-router)#exit

R4(config)#router eigrp 100
R4(config-router)#network 41.0.0.0
R4(config-router)#network 48.0.0.0
R4(config-router)#network 34.0.0.0
R4(config-router)#exit

R4#show ip eigrp neighbors

IP-EIGRP neighbors for process 100

H Address Interface Hold Uptime SRTT RTO Q Seq

(sec) (ms) Cnt Num

0 48.1.1.2 Se6/3 11 02:13:21 80 480 0 92

2 41.1.1.2 Se5/3 10 02:24:23 69 414 0 282

1 34.1.1.1 Se5/2 12 02:24:24 77 462 0 394

R5(config)#router eigrp 100
R5(config-router)#network 15.0.0.0
R5(config-router)#network 55.0.0.0
R5(config-router)#network 51.0.0.0
R5(config-router)#exit

R6(config)#router eigrp 100
R6(config-router)#network 26.0.0.0
R6(config-router)#network 192.168.61.0
R6(config-router)#network 192.168.62.0
R6(config-router)#network 192.168.63.0
R6(config-router)#network 192.168.64.0
R6(config-router)#exit

R7(config)#router eigrp 100
R7(config-router)#network 71.0.0.0
R7(config-router)#network 37.0.0.0
R7(config-router)#network 79.0.0.0
R7(config-router)#exit

R8(config)#router eigrp 100
R8(config-router)#network 48.0.0.0
R8(config-router)#network 192.168.81.0
R8(config-router)#network 192.168.82.0
R8(config-router)#network 192.168.83.0
R8(config-router)#network 192.168.84.0
R8(config-router)#network 80.0.0.0
R8(config-router)#network 81.0.0.0
R8(config-router)#network 82.0.0.0
R8(config-router)#network 83.0.0.0
R8(config-router)#exit

R9(config)#router eigrp 100
R9(config-router)#network 79.0.0.0
R9(config-router)#network 192.168.91.0
R9(config-router)#network 192.168.92.0
R9(config-router)#network 192.168.93.0
R9(config-router)#network 192.168.94.0
R9(config-router)#exit

R10(config)#router eigrp 100
R10(config-router)#network 51.0.0.0
R10(config-router)#exit

R10(config)#router ospf 200
R10(config-router)#network 192.168.101.0 255.0.0.0 area 0
R10(config-router)#network 192.168.102.0 255.0.0.0 area 0
R10(config-router)#network 192.168.103.0 255.0.0.0 area 0
R10(config-router)#network 192.168.104.0 255.0.0.0 area 0
R10(config-router)#exit

R10#show ip protocols

Routing Protocol is "eigrp 100"

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 metric weight K1=1, K2=0, K3=1, K4=0, K5=0

EIGRP maximum hopcount 100

EIGRP maximum metric variance 1

EIGRP NSF-aware route hold timer is 240s

Automatic network summarization is in effect

Maximum path: 4

Routing for Networks:

51.0.0.0

Routing Information Sources:

Gateway Distance Last Update

51.1.1.1 90 01:00:17

Distance: internal 90 external 170

Routing Protocol is "ospf 200"

Outgoing update filter list for all interfaces is not set

Incoming update filter list for all interfaces is not set

Router ID 192.168.104.4

Number of areas in this router is 1. 1 normal 0 stub 0 nssa

Maximum path: 4

Routing for Networks:

192.0.0.0 0.255.255.255 area 0

Reference bandwidth unit is 100 mbps

Routing Information Sources:

Gateway Distance Last Update

Distance: (default is 110)

R11(config)#router eigrp 100
R11(config-router)#network 71.0.0.0
R11(config-router)#network 192.168.11.0
R11(config-router)#network 192.168.12.0
R11(config-router)#network 192.168.13.0
R11(config-router)#network 192.168.14.0
R11(config-router)#exit

R12(config)#router eigrp 100
R12(config-router)#network 55.0.0.0
R12(config-router)#exit

R12(config)#router ospf 100
R12(config-router)#network 192.168.112.0 255.0.0.0 area 0
R12(config-router)#network 192.168.123.0 255.0.0.0 area 0
R12(config-router)#network 192.168.124.0 255.0.0.0 area 0
R12(config-router)#network 192.168.125.0 255.0.0.0 area 0
R12(config-router)#exit

R12#show ip protocols

Routing Protocol is "eigrp 100"

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 metric weight K1=1, K2=0, K3=1, K4=0, K5=0

EIGRP maximum hopcount 100

EIGRP maximum metric variance 1

EIGRP NSF-aware route hold timer is 240s

Automatic network summarization is in effect

Maximum path: 4

Routing for Networks:

55.0.0.0

Routing Information Sources:

Gateway Distance Last Update

55.1.1.1 90 01:01:26

Distance: internal 90 external 170

Routing Protocol is "ospf 100"

Outgoing update filter list for all interfaces is not set

Incoming update filter list for all interfaces is not set

Router ID 192.168.125.4

Number of areas in this router is 1. 1 normal 0 stub 0 nssa

Maximum path: 4

Routing for Networks:

192.0.0.0 0.255.255.255 area 0

Reference bandwidth unit is 100 mbps

Routing Information Sources:

Gateway Distance Last Update

Distance: (default is 110)

R1(config)#key chain internetworks
R1(config-keychain)#key 1
R1(config-keychain-key)#key-string ccie
R1(config-keychain-key)#exit
R1(config-keychain)#exit

R1(config)#interface serial 5/0
R1(config-if)#ip authentication mode eigrp 100 md5
R1(config-if)#ip authentication key-chain eigrp 100 internetworks
R1(config-if)#exit

R1(config)#interface serial 5/3
R1(config-if)#ip authentication mode eigrp 100 md5
R1(config-if)#ip authentication key-chain eigrp 100 internetworks
R1(config-if)#exit

R1(config)#interface serial 6/0
R1(config-if)#ip authentication mode eigrp 100 md5
R1(config-if)#ip authentication key-chain eigrp 100 internetworks
R1(config-if)#exit

%DUAL-5-NBRCHANGE: IP-EIGRP(0) 100: Neighbor 12.1.1.2 (Serial5/0) is down: authentication mode changed
%DUAL-5-NBRCHANGE: IP-EIGRP(0) 100: Neighbor 15.1.1.2 (Serial6/0) is down: authentication mode changed

R2(config)#key chain internetworks
R2(config-keychain)#key 1
R2(config-keychain-key)#key-string ccie
R2(config-keychain-key)#exit
R2(config-keychain)#exit

R2(config)#interface serial 5/0
R2(config-if)#ip authentication mode eigrp 100 md5
R2(config-if)#ip authentication key-chain eigrp 100 internetworks
R2(config-if)#exit

R2(config)#interface serial 5/1
R2(config-if)#ip authentication mode eigrp 100 md5
R2(config-if)#ip authentication key-chain eigrp 100 internetworks
R2(config-if)#exit

R2(config)#interface serial 6/1
R2(config-if)#ip authentication mode eigrp 100 md5
R2(config-if)#ip authentication key-chain eigrp 100 internetworks
R2(config-if)#exit

%DUAL-5-NBRCHANGE: IP-EIGRP(0) 100: Neighbor 12.1.1.1 (Serial5/0) is down: authentication mode changed
%DUAL-5-NBRCHANGE: IP-EIGRP(0) 100: Neighbor 23.1.1.2 (Serial5/1) is down: authentication mode changed
%DUAL-5-NBRCHANGE: IP-EIGRP(0) 100: Neighbor 26.1.1.2 (Serial6/1) is down: authentication mode changed

R3(config)#key chain internetworks
R3(config-keychain)#key 1
R3(config-keychain-key)#key-string ccie
R3(config-keychain-key)#exit
R3(config-keychain)#exit

R3(config)#interface serial 5/2
R3(config-if)#ip authentication mode eigrp 100 md5
R3(config-if)#ip authentication key-chain eigrp 100 internetworks
R3(config-if)#exit

R3(config)#interface serial 5/1
R3(config-if)#ip authentication mode eigrp 100 md5
R3(config-if)#ip authentication key-chain eigrp 100 internetworks
R3(config-if)#exit

R3(config)#interface serial 6/2
R3(config-if)#ip authentication mode eigrp 100 md5
R3(config-if)#ip authentication key-chain eigrp 100 internetworks
R3(config-if)#exit

%DUAL-5-NBRCHANGE: IP-EIGRP(0) 100: Neighbor 34.1.1.2 (Serial5/2) is down: authentication mode changed
%DUAL-5-NBRCHANGE: IP-EIGRP(0) 100: Neighbor 23.1.1.1 (Serial5/1) is down: authentication mode changed
%DUAL-5-NBRCHANGE: IP-EIGRP(0) 100: Neighbor 37.1.1.2 (Serial6/2) is down: authentication mode changed

R4(config)#key chain internetworks
R4(config-keychain)#key 1
R4(config-keychain-key)#key-string ccie
R4(config-keychain-key)#exit
R4(config-keychain)#exit

R4(config)#interface serial 5/2
R4(config-if)#ip authentication mode eigrp 100 md5
R4(config-if)#ip authentication key-chain eigrp 100 internetworks
R4(config-if)#exit

R4(config)#interface serial 5/3
R4(config-if)#ip authentication mode eigrp 100 md5
R4(config-if)#ip authentication key-chain eigrp 100 internetworks
R4(config-if)#exit

R4(config)#interface serial 6/3
R4(config-if)#ip authentication mode eigrp 100 md5
R4(config-if)#ip authentication key-chain eigrp 100 internetworks
R4(config-if)#exit

%DUAL-5-NBRCHANGE: IP-EIGRP(0) 100: Neighbor 34.1.1.1 (Serial5/2) is down: authentication mode changed
%DUAL-5-NBRCHANGE: IP-EIGRP(0) 100: Neighbor 48.1.1.2 (Serial6/3) is down: authentication mode changed
%DUAL-5-NBRCHANGE: IP-EIGRP(0) 100: Neighbor 34.1.1.1 (Serial5/2) is up: new adjacency

R5(config)#key chain internetworks
R5(config-keychain)#key 1
R5(config-keychain-key)#key-string ccie
R5(config-keychain-key)#exit
R5(config-keychain)#exit

R5(config)#interface serial 6/0
R5(config-if)#ip authentication mode eigrp 100 md5
R5(config-if)#ip authentication key-chain eigrp 100 internetworks
R5(config-if)#exit

R5(config)#interface serial 6/1
R5(config-if)#ip authentication mode eigrp 100 md5
R5(config-if)#ip authentication key-chain eigrp 100 internetworks
R5(config-if)#exit

R5(config)#interface serial 6/2
R5(config-if)#ip authentication mode eigrp 100 md5
R5(config-if)#ip authentication key-chain eigrp 100 internetworks
R5(config-if)#exit

R6(config)#key chain internetworks
R6(config-keychain)#key 1
R6(config-keychain-key)#key-string ccie
R6(config-keychain-key)#exit
R6(config-keychain)#exit

R6(config)#interface serial 6/1
R6(config-if)#ip authentication mode eigrp 100 md5
R6(config-if)#ip authentication key-chain eigrp 100 internetworks
R6(config-if)#exit

%DUAL-5-NBRCHANGE: IP-EIGRP(0) 100: Neighbor 26.1.1.1 (Serial6/1) is up: new adjacency

R7(config)#key chain internetworks
R7(config-keychain)#key 1
R7(config-keychain-key)#key-string ccie
R7(config-keychain-key)#exit
R7(config-keychain)#exit

R7(config)#interface serial 6/2

R7(config-if)#ip authentication mode eigrp 100 md5
R7(config-if)#ip authentication key-chain eigrp 100 internetworks
R7(config-if)#exit

R7(config)#interface serial 6/4
R7(config-if)#ip authentication mode eigrp 100 md5
R7(config-if)#ip authentication key-chain eigrp 100 internetworks
R7(config-if)#exit

R7(config)#interface serial 6/3
R7(config-if)#ip authentication mode eigrp 100 md5
R7(config-if)#ip authentication key-chain eigrp 100 internetworks
R7(config-if)#exit

R8(config)#key chain internetworks
R8(config-keychain)#key 1
R8(config-keychain-key)#key-string ccie
R8(config-keychain-key)#exit
R8(config-keychain)#exit

R8(config)#interface serial 6/3
R8(config-if)#ip authentication mode eigrp 100 md5
R8(config-if)#ip authentication key-chain eigrp 100 internetworks
R8(config-if)#exit

R9(config)#key chain internetworks
R9(config-keychain)#key 1
R9(config-keychain-key)#key-string ccie
R9(config-keychain-key)#exit
R9(config-keychain)#exit

R9(config)#interface serial 6/4
R9(config-if)#ip authentication mode eigrp 100 md5
R9(config-if)#ip authentication key-chain eigrp 100 internetworks
R9(config-if)#exit

R10(config)#key chain internetworks
R10(config-keychain)#key 1
R10(config-keychain-key)#key-string ccie
R10(config-keychain-key)#exit
R10(config-keychain)#exit

R10(config)#interface serial 6/2
R10(config-if)#ip authentication mode eigrp 100 md5
R10(config-if)#ip authentication key-chain eigrp 100 internetworks
R10(config-if)#exit

R11(config)#key chain internetworks
R11(config-keychain)#key 1
R11(config-keychain-key)#key-string ccie
R11(config-keychain-key)#exit
R11(config-keychain)#exit

R11(config)#interface serial 6/3
R11(config-if)#ip authentication mode eigrp 100 md5
R11(config-if)#ip authentication key-chain eigrp 100 internetworks
R11(config-if)#exit

%DUAL-5-NBRCHANGE: IP-EIGRP(0) 100: Neighbor 71.1.1.1 (Serial6/3) is down: authentication mode changed

R12(config)#key chain internetworks
R12(config-keychain)#key 1
R12(config-keychain-key)#key-string ccie
R12(config-keychain-key)#exit
R12(config-keychain)#exit

R12(config)#interface serial 6/1
R12(config-if)#ip authentication mode eigrp 100 md5
R12(config-if)#ip authentication key-chain eigrp 100 internetworks
R12(config-if)#exit

%DUAL-5-NBRCHANGE: IP-EIGRP(0) 100: Neighbor 55.1.1.1 (Serial6/1) is up: new adjacency

R12(config)#router eigrp 100
R12(config-router)#redistribute ospf 100 metric 1000 2000 255 100 1500
R12(config-router)#exit

R12#show ip protocols

Routing Protocol is "eigrp 100"

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 metric weight K1=1, K2=0, K3=1, K4=0, K5=0

EIGRP maximum hopcount 100

EIGRP maximum metric variance 1

Redistributing: eigrp 100, ospf 100

EIGRP NSF-aware route hold timer is 240s

Automatic network summarization is in effect

Maximum path: 4

Routing for Networks:

55.0.0.0

Routing Information Sources:

Gateway Distance Last Update

55.1.1.1 90 01:01:26

Distance: internal 90 external 170

R10(config)#router eigrp 100
R10(config-router)#redistribute ospf 200 metric 1000 2000 255 100 1500
R10(config-router)#exit

R10#show ip protocols

Routing Protocol is "eigrp 100"

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 metric weight K1=1, K2=0, K3=1, K4=0, K5=0

EIGRP maximum hopcount 100

EIGRP maximum metric variance 1

Redistributing: eigrp 100, ospf 200

EIGRP NSF-aware route hold timer is 240s

Automatic network summarization is in effect

Maximum path: 4

Routing for Networks:

51.0.0.0

Routing Information Sources:

Gateway Distance Last Update

51.1.1.1 90 01:00:17

Distance: internal 90 external 170

R1#show ip route
Codes: 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

Gateway of last resort is not set

D EX 192.168.123.0/24 [170/4096000] via 15.1.1.2, 00:46:03, Serial6/0
D    34.0.0.0/8 [90/2681856] via 41.1.1.1, 00:34:54, Serial5/3
D    51.0.0.0/8 [90/2681856] via 15.1.1.2, 00:46:03, Serial6/0
D    192.168.63.0/24 [90/2809856] via 12.1.1.2, 00:24:24, Serial5/0
D    192.168.12.0/24 [90/3833856] via 41.1.1.1, 00:34:54, Serial5/3
                     [90/3833856] via 12.1.1.2, 00:34:54, Serial5/0
D    192.168.62.0/24 [90/2809856] via 12.1.1.2, 00:24:25, Serial5/0
D    192.168.13.0/24 [90/3833856] via 41.1.1.1, 00:34:54, Serial5/3
                     [90/3833856] via 12.1.1.2, 00:34:54, Serial5/0
D    192.168.91.0/24 [90/3833856] via 41.1.1.1, 00:34:54, Serial5/3
                     [90/3833856] via 12.1.1.2, 00:34:54, Serial5/0
D EX 192.168.104.0/24 [170/4096000] via 15.1.1.2, 00:46:03, Serial6/0
D    192.168.14.0/24 [90/3833856] via 41.1.1.1, 00:34:54, Serial5/3
                     [90/3833856] via 12.1.1.2, 00:34:54, Serial5/0
D    192.168.61.0/24 [90/2809856] via 12.1.1.2, 00:24:25, Serial5/0
D    48.0.0.0/8 [90/2681856] via 41.1.1.1, 00:34:55, Serial5/3
D    71.0.0.0/8 [90/3705856] via 41.1.1.1, 00:34:55, Serial5/3
                [90/3705856] via 12.1.1.2, 00:34:55, Serial5/0
D    81.0.0.0/8 [90/2684416] via 41.1.1.1, 00:04:31, Serial5/3
D    55.0.0.0/8 [90/2681856] via 15.1.1.2, 00:46:04, Serial6/0
D    192.168.93.0/24 [90/3833856] via 41.1.1.1, 00:34:55, Serial5/3
                     [90/3833856] via 12.1.1.2, 00:34:55, Serial5/0
D    80.0.0.0/8 [90/2684416] via 41.1.1.1, 00:04:34, Serial5/3
D    192.168.92.0/24 [90/3833856] via 41.1.1.1, 00:34:55, Serial5/3
                     [90/3833856] via 12.1.1.2, 00:34:55, Serial5/0
D    83.0.0.0/8 [90/2684416] via 41.1.1.1, 00:04:24, Serial5/3
D    23.0.0.0/8 [90/2681856] via 12.1.1.2, 00:34:55, Serial5/0
D EX 192.168.125.0/24 [170/4096000] via 15.1.1.2, 00:46:04, Serial6/0
D    192.168.11.0/24 [90/3833856] via 41.1.1.1, 00:34:55, Serial5/3
                     [90/3833856] via 12.1.1.2, 00:34:55, Serial5/0
D    82.0.0.0/8 [90/2684416] via 41.1.1.1, 00:04:28, Serial5/3
D    192.168.94.0/24 [90/3833856] via 41.1.1.1, 00:34:55, Serial5/3
                     [90/3833856] via 12.1.1.2, 00:34:55, Serial5/0
D    37.0.0.0/8 [90/3193856] via 41.1.1.1, 00:34:55, Serial5/3
                [90/3193856] via 12.1.1.2, 00:34:55, Serial5/0
D EX 192.168.124.0/24 [170/4096000] via 15.1.1.2, 00:46:04, Serial6/0
D    192.168.64.0/24 [90/2809856] via 12.1.1.2, 00:24:25, Serial5/0
D    192.168.81.0/24 [90/2809856] via 41.1.1.1, 00:23:52, Serial5/3
D    192.168.83.0/24 [90/2809856] via 41.1.1.1, 00:23:52, Serial5/3
D    10.0.0.0/8 [90/3196416] via 41.1.1.1, 00:18:24, Serial5/3
                [90/3196416] via 12.1.1.2, 00:18:24, Serial5/0
D    192.168.82.0/24 [90/2809856] via 41.1.1.1, 00:23:52, Serial5/3
C    41.0.0.0/8 is directly connected, Serial5/3
D    26.0.0.0/8 [90/2681856] via 12.1.1.2, 00:46:04, Serial5/0
D EX 192.168.112.0/24 [170/4096000] via 15.1.1.2, 00:46:04, Serial6/0
D    79.0.0.0/8 [90/3705856] via 41.1.1.1, 00:34:55, Serial5/3
                [90/3705856] via 12.1.1.2, 00:34:55, Serial5/0
C    12.0.0.0/8 is directly connected, Serial5/0
D EX 192.168.102.0/24 [170/4096000] via 15.1.1.2, 00:46:04, Serial6/0
D EX 192.168.103.0/24 [170/4096000] via 15.1.1.2, 00:46:04, Serial6/0
D    192.168.84.0/24 [90/2809856] via 41.1.1.1, 00:23:52, Serial5/3
C    15.0.0.0/8 is directly connected, Serial6/0
D EX 192.168.101.0/24 [170/4096000] via 15.1.1.2, 00:46:04, Serial6/0

R1#show ip eigrp neighbors
IP-EIGRP neighbors for process 100
H   Address                 Interface       Hold Uptime   SRTT   RTO Q Seq
                                            (sec)         (ms)       Cnt Num
2   41.1.1.1                Se5/3             10 00:03:45   67   402 0 16
1   15.1.1.2                Se6/0             11 00:21:39   70   420 0 152
0   12.1.1.2                Se5/0             14 00:42:09   64   384 0 314

R8(config)#router eigrp 100
R8(config-router)#passive-interface fastethernet 0/0
R8(config-router)#passive-interface fastethernet 2/0
R8(config-router)#passive-interface fastethernet 3/0
R8(config-router)#passive-interface fastethernet 3/1
R8(config-router)#exit

R8#show ip eigrp interfaces

IP-EIGRP interfaces for process 100

Xmit Queue Mean Pacing Time Multicast Pending

Interface Peers Un/Reliable SRTT Un/Reliable Flow Timer Routes

Se6/3 1 0/0 60 0/15 259 0

Lo1 0 0/0 0 0/1 0 0

Lo2 0 0/0 0 0/1 0 0

Lo3 0 0/0 0 0/1 0 0

Lo4 0 0/0 0 0/1 0 0

R9(config)#interface serial 6/4
R9(config-if)#ip summary-address eigrp 100 192.168.88.0 255.255.248.0
R9(config-if)#exit

R9(config)#router eigrp 100
R9(config-router)#eigrp stub summary
R9(config-router)#exit

%DUAL-5-NBRCHANGE: IP-EIGRP(0) 100: Neighbor 79.1.1.1 (Serial6/4) is resync: summary configured
%DUAL-5-NBRCHANGE: IP-EIGRP(0) 100: Neighbor 79.1.1.1 (Serial6/4) is down: peer info changed
%DUAL-5-NBRCHANGE: IP-EIGRP(0) 100: Neighbor 79.1.1.1 (Serial6/4) is up: new adjacency

R11(config)#interface serial 6/3

R11(config-if)#ip summary-address eigrp 100 192.168.8.0 255.255.248.0

R11(config-if)#exit

R11(config)#router eigrp 100

R11(config-router)#eigrp stub summary

R11(config-router)#exit

%DUAL-5-NBRCHANGE: IP-EIGRP(0) 100: Neighbor 71.1.1.1 (Serial6/3) is resync: summary configured

%DUAL-5-NBRCHANGE: IP-EIGRP(0) 100: Neighbor 71.1.1.1 (Ser ial6/3) is down: peer info changed

%DUAL-5-NBRCHANGE: IP-EIGRP(0) 100: Neighbor 71.1.1.1 (Serial6/3) is up: new adjacency

R1#show ip route 192.168.11.1
Routing entry for 192.168.8.0/21, supernet
Known via "eigrp 100", distance 90, metric 3833856, type internal
Redistributing via eigrp 100
Last update from 41.1.1.1 on Serial5/3, 00:13:59 ago
Routing Descriptor Blocks:
    41.1.1.1, from 41.1.1.1, 00:13:59 ago, via Serial5/3
      Route metric is 3833856, traffic share count is 1
      Total delay is 85000 microseconds, minimum bandwidth is 1544 Kbit
      Reliability 255/255, minimum MTU 1500 bytes
      Loading 1/255, Hops 4
* 12.1.1.2, from 12.1.1.2, 00:13:59 ago, via Serial5/0
      Route metric is 3833856, traffic share count is 1
      Total delay is 85000 microseconds, minimum bandwidth is 1544 Kbit
      Reliability 255/255, minimum MTU 1500 bytes
      Loading 1/255, Hops 4

R1#show ip route

Codes: 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

Gateway of last resort is not set

D EX 192.168.123.0/24 [170/4096000] via 15.1.1.2, 01:07:02, Serial6/0

D 34.0.0.0/8 [90/2681856] via 41.1.1.1, 01:07:02, Serial5/3

D 51.0.0.0/8 [90/2681856] via 15.1.1.2, 01:07:02, Serial6/0

D 192.168.63.0/24 [90/2809856] via 12.1.1.2, 01:07:02, Serial5/0

D 192.168.62.0/24 [90/2809856] via 12.1.1.2, 01:07:02, Serial5/0

D EX 192.168.104.0/24 [170/4096000] via 15.1.1.2, 01:07:02, Serial6/0

D 192.168.61.0/24 [90/2809856] via 12.1.1.2, 01:07:02, Serial5/0

D 48.0.0.0/8 [90/2681856] via 41.1.1.1, 01:07:02, Serial5/3

D 71.0.0.0/8 [90/3705856] via 41.1.1.1, 01:07:02, Serial5/3

[90/3705856] via 12.1.1.2, 01:07:02, Serial5/0

D 81.0.0.0/8 [90/2684416] via 41.1.1.1, 01:07:02, Serial5/3

D 55.0.0.0/8 [90/2681856] via 15.1.1.2, 01:07:02, Serial6/0

D 80.0.0.0/8 [90/2684416] via 41.1.1.1, 01:07:02, Serial5/3

D 83.0.0.0/8 [90/2684416] via 41.1.1.1, 01:07:02, Serial5/3

D 23.0.0.0/8 [90/2681856] via 12.1.1.2, 01:07:02, Serial5/0

D EX 192.168.125.0/24 [170/4096000] via 15.1.1.2, 01:07:02, Serial6/0

D 82.0.0.0/8 [90/2684416] via 41.1.1.1, 01:07:02, Serial5/3

D 37.0.0.0/8 [90/3193856] via 41.1.1.1, 01:07:02, Serial5/3

[90/3193856] via 12.1.1.2, 01:07:02, Serial5/0

D EX 192.168.124.0/24 [170/4096000] via 15.1.1.2, 01:07:02, Serial6/0

D 192.168.64.0/24 [90/2809856] via 12.1.1.2, 01:07:02, Serial5/0

D 192.168.81.0/24 [90/2809856] via 41.1.1.1, 01:07:02, Serial5/3

D 192.168.83.0/24 [90/2809856] via 41.1.1.1, 01:07:02, Serial5/3

D 192.168.82.0/24 [90/2809856] via 41.1.1.1, 01:07:02, Serial5/3

C 41.0.0.0/8 is directly connected, Serial5/3

D 26.0.0.0/8 [90/2681856] via 12.1.1.2, 01:07:02, Serial5/0

D EX 192.168.112.0/24 [170/4096000] via 15.1.1.2, 01:07:02, Serial6/0

D 79.0.0.0/8 [90/3705856] via 41.1.1.1, 01:07:02, Serial5/3

[90/3705856] via 12.1.1.2, 01:07:02, Serial5/0

C 12.0.0.0/8 is directly connected, Serial5/0

D EX 192.168.102.0/24 [170/4096000] via 15.1.1.2, 01:07:02, Serial6/0

D EX 192.168.103.0/24 [170/4096000] via 15.1.1.2, 01:07:02, Serial6/0

D 192.168.84.0/24 [90/2809856] via 41.1.1.1, 01:07:02, Serial5/3

C 15.0.0.0/8 is directly connected, Serial6/0

D EX 192.168.101.0/24 [170/4096000] via 15.1.1.2, 01:07:02, Serial6/0

D 192.168.88.0/21 [90/3833856] via 41.1.1.1, 01:07:02, Serial5/3

[90/3833856] via 12.1.1.2, 01:07:02, Serial5/0

D 192.168.8.0/21 [90/3833856] via 41.1.1.1, 01:07:03, Serial5/3

[90/3833856] via 12.1.1.2, 01:07:03, Serial5/0

R1#ping 12.1.1.2