Download - Lesson 1 - Introduction to EIGRP
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Configuring EIGRP
BSCI Modulo 2-1 Introduccin a EIGRP
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Objetivos
This module will cover topics which allow students tomeet the following objectives:
Describir las capacidades claves que distinguen EIGRP de losotros protocolos de enrutamiento
Identificar las cuatro tecnologas clave empleadas por EIGRPDescribir cmo funciona EIGRP
Describir los cinco componentes de la mtrica utilizados porEIGRP
Calcular la mtrica EIGRP para una gama de rutas entre
enrutadores
Explicar cmo rutas IGRP son integrados en rutas EIGRP yviceversa
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Purpose of this Lesson
Coverage of topics new to the EIGRP module of BSCI.
Qu es lo nuevo en este mdulo?
EIGRP metric calculations for pathway ranges between routers.
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EIGRP caracteristicas
Hay varias diferencias claves entre EIGRP y otrosprotocolos de enrutamiento que se estudiaron en elCCNA.
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EIGRP Key Technologies
Neighbor discover/recovery
Reliable Transport Protocol (RTP)
DUAL finite-state machine
Protocol-dependent modules (PDMs)
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The Diffusing Update Algorithm (DUAL)
Cmo EIGRP determinaqu rutas son libres debucle?
Cada uno de los vecinos deA indica la posibilidad deacceso a E
B con un costo de 10
C con un costo de 10
D con un costo de 30
Estos tres costos sonllamados reporteddistance (RD);
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The Diffusing Update Algorithm (DUAL)
En A, el costo total paraalcanzar E es:
20 a travs de B
25 a travs de C
45 a travs de D
El mejor de estas tresrutas es a travs de B.
Este es la feasibledistance (FD)
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The Diffusing Update Algorithm (DUAL)
A uses the FD and the RDto determine which pathsare loop-free
The best path (FD) is usedas a benchmark; all pathswith RDs lower than the FDcannot contain loops
The algorithm may mark
some loop-free paths asloops
However, it is guaranteednever to mark a looped pathas loop-free
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The Diffusing Update Algorithm (DUAL)
At A:
The path through B is thebest path (FD), at 20
C can reach E with a costof 10; 10 (RD) is less than20 (FD), so this path isloop-free.
D can reach E with a
cost of 30; 30 (RD) isnot less than 20 (FD),so EIGRP assumesthis path is a loop.
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EIGRP Topology Table
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RTRA#show ip eigrp neighbors
IP-EIGRP neighbors for process 1
H Address Interface Hold Uptime SRTT RTO Q Seq
(sec) (ms) Cnt Num
2 10.1.1.1 Et0 12 6d16h 20 200 0 233
1 10.1.4.3 Et1 13 2w2d 87 522 0 4520 10.1.4.2 Et1 10 2w2d 85 510 0 3
Seconds Remaining Before Declaring Neighbor Down
How Long Since theLast Time Neighbor Was Discovered
How Long It Takes for This Neighbor To Respond To Reliable Packets
How Long to Wait Before Retransmitting If No Acknowledgement
EIGRP Neighbor Status
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EIGRP IP Routing Table
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Example: EIGRP TablesRouter Cs tables:
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EIGRP Packets
Hello: Establish neighbor relationships.
Update: Send routing updates
Query: Ask neighbors about routing information
Reply: Respond to query about routing information
ACK: Acknowledge a reliable packet
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Initial Route Discovery
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EIGRP Metric
Same metric components as IGRP:
Bandwidth
Delay
Reliability
Loading
MTU
EIGRP metric is IGRP metric multiplied by 256
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EIGRP Metric Calculation
By default, EIGRP metric:
Metric = bandwidth (slowest link) + delay (sum of delays)
Delay = sum of the delays in the path, in tens ofmicroseconds, multiplied by 256.
Bandwidth = [10 / (minimum bandwidth link along thepath, in kilobits per second)] * 256
Formula with default K values (K1 = 1, K2 = 0, K3 = 1,K4 = 0, K5 = 0):
Metric = [K1 * BW + ((K2 * BW) / (256 load)) + K3 * delay]
If K5 not equal to 0:
Metric = Metric * [K5 / (reliability + K4)]
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EIGRP Metrics Calculation Example
A B C D Least bandwidth 64 kbps Total delay 6,000
A X Y Z D Least bandwidth 256 kbps Total delay 8,000
Delay is the sum of all the delays of the links along the paths:Delay = [delay in tens of microseconds] x 256
BW is the lowest bandwidth of the links along the paths:BW = [10,000,000 / (bandwidth in kbps)] x 256
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EIGRP Metrics Are Backward-Compatible
with IGRP
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Summary
EIGRP capabilities include fast convergence and support forVLSM, partial updates, and multiple network layer protocols.
EIGRP key technologies are: neighbor discovery/recovery, RTP,DUAL finite-state machine, and protocol-dependent modules.
EIGRP uses three tables: neighbor table, topology table, androuting table. The routing table contains the best route to eachdestination, called the successor route. A feasible successor routeis a backup route to a destination; it is kept in the topology table.
EIGRP uses the same metric components as IGRP: delay,
bandwidth, reliability, load, and MTU. By default, EIGRP metric = bandwidth (slowest link) + delay (sum
of delays).
EIGRP metrics are backward-compatible with IGRP; the EIGRP-equivalent metric is the IGRP metric multiplied by 256.
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Self Check
What is a reported distance?
What is a feasible distance?
EIGRP uses three tables: name the three tables: __________,____________, _____________. Which of the tables contains the
best route or successor route to each destination?
EIGRP uses what metrics? __________, _________, _________,__________, ___________
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Resources
http://www.cisco.com/en/US/tech/tk365/technologies_tech_note09186a008009405c.shtml
http://www.cisco.com/en/US/tech/tk365/technologies_tech_note09186a0080093f07.shtml
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Q and A
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