day 3 enhanced igrp (eigrp) and open shortest path first (ospf)
DESCRIPTION
What are Dynamic Routing Protocol ? ENHANCED IGRP (EIGRP) AND OPEN SHORTEST PATH FIRST (OSPF)TRANSCRIPT
ENHANCED IGRP
(EIGRP) AND OPEN
SHORTEST PATH FIRST
(OSPF) By
Anil Kumar Vishwakarma
MCA,MCTS,CCNA
ENHANCED IGRP (EIGRP)
EIGRP Characteristics.
EIGRP Configuration.
Verifying EIGRP.
EIGRP CHARACTERISTICS
Hybrid Protocol.
Cisco-proprietary protocol.
EIGRP works well in large networks.
Default AD (administrative distance) is 90.
EIGRP Metrics use a combination of (B.W, Load, Delay and
Reliability)
Uses an autonomous system number.
Maximum Hop count is 255.
Classless Routing.
Support VLSM and discontiguous networks.
EIGRP CHARACTERISTICS
Support for IP, IPX, and AppleTalk via protocol-
dependent modules
Communication via Reliable Transport Protocol (RTP)
Best path selection via Diffusing Update Algorithm
(DUAL)
Build three table: -
1. Neighbor table: Each router keeps state information about adjacent
neighbors.
2. Topology table: acted upon by (DUAL). Use to determine the best
path for routing packet.
3. Routing table: Store routes.
EIGRP CONFIGURATION
EIGRP CONFIGURATION
Configuring Discontiguous Networks
Lab_A(config)#router eigrp 100 Lab_A(config-router)#no auto-summary Lab_B(config)#router eigrp 100 Lab_B(config-router)#no auto-summary
VERIFYING EIGRP
Description/Function Command
Shows the entire routing
table show ip route
Shows only EIGRP entries in
the routing table show ip route eigrp
Shows all EIGRP neighbors show ip eigrp
neighbors
Shows entries in the EIGRP
topology table show ip eigrp topology
OPEN SHORTEST PATH FIRST
OSPF Characteristics.
OSPF Terminology
OSPF Configuration.
Verifying OSPF.
OSPF and Loopback Interfaces.
Troubleshooting OSPF.
OSPF CHARACTERISTICS
Link State Protocol.
Open Standard protocol.
OSPF works well in large networks.
Default AD (administrative distance) is 110.
EIGRP Metrics use Bandwidth.
Uses an autonomous system number.
No Limit Hop count.
Classless Routing.
Support VLSM and discontiguous networks.
OSPF CHARACTERISTICS
Support IP only.
Best path selection via Dijkstra algorithm.
Manual Summarization.
Build three table: -
1. Neighbor table: Each router keeps state information about
adjacent neighbors.
2. Topology table: acted upon by (Dijkstra). Use to determine the
best path for routing packet.
3. Routing table: Store routes.
OSPF TERMINOLOGY
OSPF TERMINOLOGY
Link is an interface on a router.
The Router ID (RID) is the highest IP
address used to identify the router.
OSPF TERMINOLOGY
Link-State: the status of link between
two routers
OSPF TERMINOLOGY
Link-state database (topological database): A
list of information about all other routers in the
internetwork. It shows the internetwork topolog.
OSPF TERMINOLOGY
Area: A collection of routers that has the same area
identification. Each router within an area has the same
link-state information. A router within an area is called
an internal router.
OSPF TERMINOLOGY
Cost (metric): The value assigned to a link.
Based on the bandwidth of the link.
OSPF TERMINOLOGY
Routing table: sometimes known
as the forwarding database.
OSPF TERMINOLOGY
Adjacencies database: A listing of all the neighbors to
which a router has established a bi-directional
communication.
OSPF TERMINOLOGY
Designated router (DR) and backup
designated router (BDR): A router that is elected
by all other routers on the same LAN to represent all
the routers. Each network has a DR and BDR.
OSPF CONFIGURATION
The two basic elements of OSPF configuration:
1. Enabling OSPF.
2. Configuring OSPF areas.
Router#config t
Router(config)#router ospf 1
Router(config-router)#network 10.0.0.0 0.255.255.255
area 0
VERIFYING OSPF
Description/Function Command
Shows the entire routing table show ip route
Display OSPF information for one
or all OSPF processes running on
the router. show ip ospf
the number of links and the
neighboring router’s ID show ip ospf database
Displays all interface-related
OSPF information.
show ip ospf interface
OSPF AND LOOPBACK INTERFACES
Configuring loopback interfaces when using the OSPF routing protocol is
important, and Cisco suggests using them whenever you configure
OSPF on a router.
Loopback interfaces are logical interfaces, which are virtual, software-
only interfaces; they are not real router interfaces.
Configuring Loopback Interfaces
Router (config)#int loopback 0
Router (config-if)#ip address 172.16.10.1
255.255.255.255
Router(config-if)#no shut
TROUBLESHOOTING OSPF
What is the error in this configuration if you want to route only ip packet begin with 10 then any number ?
Router(config)#router ospf 1
Router(config-router)#network 10.0.0.0 255.0.0.0 area 0
RouterB#sh ip ospf interface e0/0
Ethernet0/0 is up, line protocol is up
Internet Address 172.16.1.1/16, Area 0
Process ID 2, Router ID 172.126.1.1,
Network Type BROADCAST, Cost: 10
Transmit Delay is 1 sec, State DR, Priority
1
Designated Router (ID) 172.16.1.1,
interface address 172.16.1.2
No backup designated router on this
network
Timer intervals configured, Hello 10, Dead
40, Wait 40, Retransmit 5
RouterA#sh ip ospf interface e0/0
Ethernet0/0 is up, line protocol is up
Internet Address 172.16.1.2/16, Area 0
Process ID 2, Router ID 172.126.1.1,
Network Type BROADCAST, Cost: 10
Transmit Delay is 1 sec, State DR, Priority
1
Designated Router (ID) 172.16.1.2,
interface address 172.16.1.1
No backup designated router on this
network
Timer intervals configured, Hello 5, Dead
20, Wait 20, Retransmit 5
Thank You