EIGRP Routing Protocols
Name: Sultan Abdullah Supervisor: Mohammed Elmaqhawri
ID: 202622018 Networking: 7-1
The Rules of the lesson !!!
• Please do not use your phone when I teach.
• Please do not talking together when I teach.
• Please raise your hand if you have any question.
Learning Objectives
• What is the router and Function of router.
• type of routing.
• What is the static routing.
• What is the dynamic routing.
• What is the EIGRP.
• EIGRP Metric Calculation.
• Basic EIGRP Configuration.
Router
• Functions of a Router
–Find the best Path Selections
–Forwarding packets to destination
• Router is a networking device that forwards data packets between computer networks.
Type of routing.
• A router can learn about remote networks in one of two ways:
–Manually, from configured static routes
–Automatically, from a dynamic routing protocol
• Purpose of a static route–A manually configured route used when routing from a network to a stub network
static routing
• Advantages of static routing-Easy to configure
-No extra resources are needed
-More secure
• Disadvantages of static routing-Network changes require manual reconfiguration
-Does not scale well in large topologies
Dynamic Routing Protocols
• Function(s) of Dynamic Routing Protocols:
-Dynamically share information between routers.
-Automatically update routing table when topology changes.
-Determine best path to a destination.
Classifying Routing Protocols
• Dynamic routing protocols are grouped according to characteristics. Examples include:
-RIP
-IGRP
-EIGRP
-OSPF
-IS-IS
-BGP
Routing Protocols Metrics• Metric
–A value used by a routing protocol to determine which routes are better than others.
• Metrics used in IP routing protocols-Bandwidth-Cost-Delay-Hop count-Load-Reliability
Routing Protocols Metrics
• The Metric Field in the Routing Table
• Metric used for each routing protocol
-RIP -
-IGRP & EIGRP -
Bandwidth (used by default), Delay (used by default), Load, Reliability
-IS-IS & OSPF
hop count
– Cost, Bandwidth
Administrative Distance of a Route
• Purpose of Administrative Distance–It’s a numeric value that specifies the preference of a particular route
EIGRPReliable Transport Protocol (RTP)
Purpose of RTP
–Used by EIGRP to transmit and receive EIGRP packets
Characteristics of RTP
–Involves both reliable & unreliable delivery of EIGRP packet
Reliable delivery requires acknowledgment from destination
Unreliable delivery does not require an acknowledgement from destination
–Packets can be sent
Unicast
Multicast
–Using address 224.0.0.10
EIGRP
EIGRP’s 5 Packet Types
• Hello packets
–Used to discover & form adjacencies with neighbors
EIGRP
• Update packets
–Used to propagate routing information
• Acknowledgement packets
–Used to acknowledge receipt of update, query & reply packets
EIGRP
• Query & Reply packetsUsed by DUAL (diffusing update algorithm) for searching of networksQuery packets• -Can use
UnicastMulticast
Reply packet • -Use only
unicast
EIGRP• Purpose of Hello Protocol
–To discover & establish adjacencies with neighbor routers
• Characteristics of hello protocol–Time interval for sending hello packet Most networks it is every 5 seconds Multipoint non broadcast multi-access networks
–Unicast every 60 seconds
-Holdtime
This is the maximum time router should wait before declaring a neighbor down
Default holdtime
– 3 times hello interval
EIGRPDiffusing Update Algorithm (DUAL)
–Purpose• EIGRP’s primary method for preventing routing loops.
–Advantage of using DUAL• Provides fast convergence time by keeping a list of loop-
free backup routes.
EIGRPAdministrative Distance (AD)
–Defined as the trustworthiness of the source route
EIGRP default administrative distances
–Summary routes = 5–Internal routes = 90–External routes = 170
EIGRPAuthentication
• EIGRP can– Encrypt routing information
– Authenticate routing information
EIGRP Metric CalculationEIGRP Composite Metric & the K Values
EIGRP uses the following values in its composite metric
-Bandwidth, delay, reliability, and load
The composite metric used by EIGRP–formula used has values K1 K5–K1 & K3 = 1–all other K values = 0
EIGRP Metric Calculation EIGRP Metrics
Delay is the defined as the measure of time it takes for a packet to traverse a route
-it is a static value based on link type to which interface is connected
More EIGRP Calculation Configuring a summary route in EIGRP
Basic EIGRP Configuration
• EIGRP autonomous system number actually functions as a process ID
• ExampleRouter(config)#router eigrp
autonomous-system
Basic EIGRP Configuration
• Verifying EIGRP
• show ip eigrp neighbors
• show ip protocols
• show ip route
• show interface
Anyquestions?
Thank you for
watching and listening