2. Cisco proprietary protocol Classless routing protocol Metric (32 bit) : Composite Metric (BW + Delay) by default. Administrative distance is 90 Updates are sent through Multicast IP address (224.0.0.10 ). Enhanced Interior Gateway Routing Protocol

3. Max Hop count is 224 (100 by default) Supports IP, IPX and Apple Talk protocols Hello packets are sent every 5 seconds Convergence rate is fast Enhanced Interior Gateway Routing Protocol

4. Autonomous System A unique number identifying the Routing domain of the routers. Ranges from 1- 65535 Public – 1 – 64512 Private – 64513 – 65535 An autonomous system is a collection of networks under a common administrative domain

5. Interior Gateway Protocol Routing protocols used within an autonomous system All routers will be routing within the same Autonomous boundary RIP, IGRP, EIGRP, OSPF, IS-IS Exterior Gateway Protocol Routing protocol used between different autonomous systems Routers in different AS need an EGP Border Gateway Protocol is extensively used as EGP IGPEGP Routing Protocol Classification

6. XYZ - AS 100ABC – AS 200 –IGPs operate within an autonomous system –EGPs connect different autonomous systems EGPs: BGP IGPs: RIP, OSPF, IGRP, EIGRP IGP & EGP

7. EIGRP Tables Neighbor Table: Contains information about directly neighbors. Topology Table: Contains entries for all the destinations, along with feasible distance, any feasible successor, Advertised distance, and the calculated cost. Routing Table: Entries with the best path for each destination from the Topology Table are moved into Routing Table.

8. EIGRP Terminology Feasible Distance: Feasible distance (FD) is the cost of the best route to a destination, including the local link cost. Reported Distance: The cost of a route as advertised by the neighbor, so it does not include the local link cost If the advertised distance is less than the feasible distance, the route is tagged as a feasible successor. Successor: The neighbor with best cost to the destination. Feasible Successor: The neighbor with second best cost to the destination.

9. EIGRP - Network Diagram LAN - 192.168.1.0/24LAN – 192.168.2.0/24 E0 192.168.3.1/24 LAN - 192.168.3.0/24 E0 192.168.1.1/24 E0 192.168.2.1/24 10.0.0.1/8 S0 S1 10.0.0.2/8 11.0.0.1/8 S0 S1 11.0.0.2/8 HYD CHE BAN

10. Works only on Cisco Routers Disadvantages of EIGRP

12. exit Hyderabad(config-if)# Hyderabad(config)# telnet 192.168.1.1 ================================ Welcome to Hyderabad Router ================================ User Access Verification password : **** **** enable configure terminal interface serial 0 ip address 10.0.0.1 255.0.0.0 no shut clockrate 64000 encapsulation hdlc Hyderabad> password : Hyderabad# Enter configuration commands, one per line. End with CNTL/Z. Hyderabad(config)# Hyderabad(config-if)# Microsoft Windows 2000 [Version 5.00.2195] (C) Copyright 1985-2000 Microsoft Corp. C:\> Connecting..... Directly Connected Networks on HYDERABAD Router 192.168.1.0 10.0.0.0 Directly Connected Networks on HYDERABAD Router 192.168.1.0 10.0.0.0

13. Hyderabad(config)# router eigrp 10 Hyderabad(config-router)# network 192.168.1.0 network 10.0.0.0 no ip routing Hyderabad(config)# ip routing Configuring EIGRP Router(config)# router eigrp Router(config-router)# network Configuring EIGRP Router(config)# router eigrp Router(config-router)# network

14. show ip route Hyderabad# Codes: C - connected, S - static, I - IGRP, 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, E - EGP i- IS-IS, L1-IS-IS level-1, L2-IS-IS level-2,*- candidate default U - per-user static route, o - ODR Gateway of last resort is not set C 10.0.0.0/8 is directly connected, Serial0 D 11.0.0.0/8 [90/2681856] via 10.0.0.2, 00:00:49, Serial0 C 192.168.1.0/24 is directly connected, Ethernet0 D 192.168.2.0/24 [90/2195456] via 10.0.0.2, 00:00:49, Serial0 D 192.168.3.0/24 [90/2707456] via 10.0.0.2, 00:00:25, Serial0 Hyderabad# ^ Z Hyderabad(config)# router eigrp 10 Hyderabad(config-router)# network 192.168.1.0 Hyderabad(config-router)#network 10.0.0.0 no ip routingHyderabad(config)# ip routing D – for EIGRP routes 90 is nothing but Administrative Distance Metric of EIGRP Composite Metric Metric of EIGRP Composite Metric

15. show ip eigrp topology Hyderabad# IP-EIGRP Topology Table for process 10 Codes: P - Passive, A - Active, U - Update, Q - Query, R - Reply, r - Reply status P 10.0.0.0/8, 1 successors, FD is 2169856 via Connected, Serial0 P 11.0.0.0/8, 1 successors, FD is 2681856 via 10.0.0.2 (2681856/2169856), Serial0 P 192.168.1.0/24, 1 successors, FD is 281600 via Connected, Ethernet0 P 192.168.2.0/24, 1 successors, FD is 2195456 via 10.0.0.2 (2195456/281600), Serial0 P 192.168.3.0/24, 1 successors, FD is 2707456 via 10.0.0.2 (2707456/2195456), Serial0 Hyderabad# show ip eigrp neighbors IP-EIGRP neighbors for process 10 H Address Interface Hold Uptime SRTT RTO Q Seq (sec) (ms) Cnt Num 0 10.0.0.2 Se0 13 00:07:24 42 252 0 8 Hyderabad#

16. Chennai(config-if)# ================================ Welcome to Chennai Router ================================ User Access Verification password : **** **** enable configure terminal ip address 10.0.0.2 255.0.0.0 no shut encapsulation hdlc interface serial 0 Chennai> password : Chennai# Enter configuration commands, one per line. End with CNTL/Z. Chennai(config)# Chennai(config-if)# Microsoft Windows 2000 [Version 5.00.2195] (C) Copyright 1985-2000 Microsoft Corp. C:\> Connecting..... Chennai(config-if)# telnet 192.168.2.1 interface serial 1 ip address 11.0.0.1 255.0.0.0 no shut encapsulation hdlc Directly Connected Networks on CHENNAI Router 192.168.2.0 10.0.0.0 11.0.0.0 Directly Connected Networks on CHENNAI Router 192.168.2.0 10.0.0.0 11.0.0.0

17. Chennai(config)# router eigrp 10 Chennai(config-router)# network 192.168.2.0 network 10.0.0.0 no ip routing Chennai(config)# ip routing network 11.0.0.0 Chennai(config-router)# Configuring EIGRP Router(config)# router eigrp Router(config-router)# network Configuring EIGRP Router(config)# router eigrp Router(config-router)# network

18. show ip route Chennai# Codes: C - connected, S - static, I - IGRP, 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, E - EGP i- IS-IS, L1-IS-IS level-1, L2-IS-IS level-2,*- candidate default U - per-user static route, o - ODR Gateway of last resort is not set C 10.0.0.0/8 is directly connected, Serial1 C 11.0.0.0/8 is directly connected, Serial0 D 192.168.1.0/24 [90/2195456] via 10.0.0.1, 00:01:27, Serial1 C 192.168.2.0/24 is directly connected, Ethernet0 D 192.168.3.0/24 [90/2195456] via 11.0.0.2, 00:01:00, Serial0 Chennai# ^ Z Chennai(config)# router eigrp 10 Chennai(config-router)# network 192.168.2.0 Chennai(config-router)#network 10.0.0.0 no ip routingChennai(config)# ip routing network 11.0.0.0 Chennai(config-router)# D – for EIGRP routes 90 is nothing but Administrative Distance Metric of IGRP Composite Metric Metric of IGRP Composite Metric

19. show ip eigrp topology Chennai# IP-EIGRP Topology Table for process 10 Codes: P - Passive, A - Active, U - Update, Q - Query, R - Reply, r - Reply status P 10.0.0.0/8, 1 successors, FD is 2169856 via Connected, Serial1 P 11.0.0.0/8, 1 successors, FD is 2169856 via Connected, Serial0 P 192.168.1.0/24, 1 successors, FD is 2195456 via 10.0.0.1 (2195456/281600), Serial1 P 192.168.2.0/24, 1 successors, FD is 281600 via Connected, Ethernet0 P 192.168.3.0/24, 1 successors, FD is 2195456 via 11.0.0.2 (2195456/281600), Serial0 Chennai# show ip eigrp neighbors IP-EIGRP neighbors for process 10 H Address Interface Hold Uptime SRTT RTO Q Seq (sec) (ms) Cnt Num 1 11.0.0.2 Se0 12 00:11:34 389 2334 0 4 0 10.0.0.1 Se1 13 00:12:02 27 200 0 5 Chennai#

20. exit Banglore(config-if)# Banglore(config)# ================================ Welcome to Banglore Router ================================ User Access Verification password : **** **** enable configure terminal ip address 11.0.0.2 255.0.0.0 no shut clockrate 64000 encapsulation hdlc Banglore> password : Banglore# Enter configuration commands, one per line. End with CNTL/Z. Banglore(config)# Banglore(config-if)# Microsoft Windows 2000 [Version 5.00.2195] (C) Copyright 1985-2000 Microsoft Corp. C:\> Connecting..... telnet 192.168.3.1 interface serial 1 Directly Connected Networks on Banglore Router 192.168.3.0 11.0.0.0 Directly Connected Networks on Banglore Router 192.168.3.0 11.0.0.0

21. Banglore(config)# router eigrp 10 Banglore(config-router)# network 192.168.3.0 network 11.0.0.0 no ip routing Banglore(config)# ip routing Configuring EIGRP Router(config)# router eigrp Router(config-router)# network Configuring EIGRP Router(config)# router eigrp Router(config-router)# network

22. show ip route Banglore# Codes: C - connected, S - static, I - IGRP, 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, E - EGP i- IS-IS, L1-IS-IS level-1, L2-IS-IS level-2,*- candidate default U - per-user static route, o - ODR Gateway of last resort is not set D 10.0.0.0/8 [90/2681856] via 11.0.0.1, 00:01:32, Serial1 C 11.0.0.0/8 is directly connected, Serial1 D 192.168.1.0/24 [90/2707456] via 11.0.0.1, 00:01:32, Serial1 D 192.168.2.0/24 [90/2195456] via 11.0.0.1, 00:01:32, Serial1 C 192.168.3.0/24 is directly connected, Ethernet0 Banglore# ^ Z Banglore(config)# router eigrp 10 Banglore(config-router)# network 192.168.3.0 Banglore(config-router)#network 11.0.0.0 no ip routingBanglore(config)# ip routing D – for EIGRP routes 90 is nothing but Administrative Distance Metric of IGRP Composite Metric Metric of IGRP Composite Metric

23. show ip eigrp topology Banglore# IP-EIGRP Topology Table for process 10 Codes: P - Passive, A - Active, U - Update, Q - Query, R - Reply, r - Reply status P 10.0.0.0/8, 1 successors, FD is 2681856 via 11.0.0.1 (2681856/2169856), Serial1 P 11.0.0.0/8, 1 successors, FD is 2169856 via Connected, Serial1 P 192.168.1.0/24, 1 successors, FD is 2707456 via 11.0.0.1 (2707456/2195456), Serial1 P 192.168.2.0/24, 1 successors, FD is 2195456 via 11.0.0.1 (2195456/281600), Serial1 P 192.168.3.0/24, 1 successors, FD is 281600 via Connected, Ethernet0 Banglore# show ip eigrp neighbors IP-EIGRP neighbors for process 10 H Address Interface Hold Uptime SRTT RTO Q Seq (sec) (ms) Cnt Num 0 11.0.0.1 Se1 14 00:14:15 36 216 0 7 Banglore#

24. ping 192.168.3.10 Hyderabad# Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 192.168.3.10, timeout is 2 seconds: Success rate is 100 percent (5/5), round-trip min/avg/max = 40/43/44 ms Hyderabad# !!!!! ping 192.168.2.10 Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 192.168.2.10, timeout is 2 seconds: Success rate is 100 percent (5/5), round-trip min/avg/max = 40/43/44 ms Hyderabad# !!!!!

25. ping 192.168.1.10 Chennai# Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 192.168.1.10, timeout is 2 seconds: Success rate is 100 percent (5/5), round-trip min/avg/max = 40/43/44 ms Chennai# !!!!! ping 192.168.3.10 Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 192.168.3.10, timeout is 2 seconds: Success rate is 100 percent (5/5), round-trip min/avg/max = 40/43/44 ms Chennai# !!!!!

26. ping 192.168.1.10 Banglore# Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 192.168.1.10, timeout is 2 seconds: Success rate is 100 percent (5/5), round-trip min/avg/max = 40/43/44 ms Banglore# !!!!! ping 192.168.2.10 Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 192.168.2.10, timeout is 2 seconds: Success rate is 100 percent (5/5), round-trip min/avg/max = 40/43/44 ms Banglore# !!!!!