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CCNA Exploration 2 - Chapter 9
1.
© 2007 Cisco
Systems, Inc. All rights reserved. Cisco Public ITE PC v4.0 Chapter 1 1 EIGRP Routing Protocols and Concepts – Chapter 9
2.
ITE PC v4.0 Chapter
1 2© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public Objectives Describe the background and history of Enhanced Interior Gateway Routing Protocol (EIGRP). Examine the basic EIGRP configuration commands and identify their purposes. Calculate the composite metric used by EIGRP. Describe the concepts and operation of DUAL. Describe the uses of additional configuration commands in EIGRP.
3.
ITE PC v4.0 Chapter
1 3© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public Introduction
4.
ITE PC v4.0 Chapter
1 4© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public EIGRP Roots of EIGRP: IGRP -Developed in 1985 to overcome RIPv1’s limited hop count -Distance vector routing protocol -Metrics used by IGRP bandwidth (used by default) Delay (used by default) reliability load -Discontinued support starting with IOS 12.2(13)T & 12.2(R1s4)S
5.
ITE PC v4.0 Chapter
1 5© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public EIGRP EIGRP Message Format EIGRP Header Data link frame header - contains source and destination MAC address IP packet header - contains source & destination IP address EIGRP packet header - contains AS number Type/Length/Field - data portion of EIGRP message
6.
ITE PC v4.0 Chapter
1 6© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public EIGRP EIGRP packet header contains –Opcode field –Autonomous System number EIGRP Parameters contains –Weights –Hold time
7.
ITE PC v4.0 Chapter
1 7© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public EIGRP TLV: IP internal contains –Metric field –Subnet mask field –Destination field TLV: IP external contains –Fields used when external routes are imported into EIGRP routing process
8.
ITE PC v4.0 Chapter
1 8© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public EIGRP Protocol Dependent Modules (PDM) EIGRP uses PDM to route several different protocols i.e. IP, IPX & AppleTalk PDMs are responsible for the specific routing task for each network layer protocol
9.
ITE PC v4.0 Chapter
1 9© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public EIGRP Reliable 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
10.
ITE PC v4.0 Chapter
1 10© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public EIGRP EIGRP’s 5 Packet Types Hello packets –Used to discover & form adjacencies with neighbors
11.
ITE PC v4.0 Chapter
1 11© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public EIGRP Update packets –Used to propagate routing information Acknowledgement packets –Used to acknowledge receipt of update, query & reply packets
12.
ITE PC v4.0 Chapter
1 12© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public EIGRP Query & Reply packets Used by DUAL for searching for networks Query packets -Can use Unicast Multicast Reply packet -Use only unicast
13.
ITE PC v4.0 Chapter
1 13© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public 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
14.
ITE PC v4.0 Chapter
1 14© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public EIGRP EIGRP Bounded Updates EIGRP only sends update when there is a change in route status Partial update –A partial update includes only the route information that has changed – the whole routing table is NOT sent Bounded update –When a route changes, only those devices that are impacted will be notified of the change EIGRP’s use of partial bounded updates minimizes use of bandwidth
15.
ITE PC v4.0 Chapter
1 15© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public EIGRP Diffusing Update Algorithm (DUAL) –Purpose •EIGRP’s primary method for preventing routing loops –Advantage of using DUAL •Provides for fast convergence time by keeping a list of loop- free backup routes
16.
ITE PC v4.0 Chapter
1 16© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public EIGRP Administrative Distance (AD) –Defined as the trustworthiness of the source route EIGRP default administrative distances –Summary routes = 5 –Internal routes = 90 –Imported routes = 170
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1 17© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public EIGRP Authentication EIGRP can – Encrypt routing information – Authenticate routing information
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1 18© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public EIGRP Network Topology Topology used is the same as previous chapters with the addition of an ISP router
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1 19© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public EIGRP EIGRP will automatically summarize routes at classful boundaries
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1 20© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public Basic EIGRP Configuration Autonomous System (AS) & Process IDs –This is a collection of networks under the control of a single authority (reference RFC 1930) –AS Numbers are assigned by IANA –Entities needing AS numbers ISP Internet Backbone prodiers Institutions connecting to other institutions using AS numbers
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1 21© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public Basic EIGRP Configuration EIGRP autonomous system number actually functions as a process ID Process ID represents an instance of the routing protocol running on a router Example Router(config)#router eigrp autonomous-system
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1 22© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public Basic EIGRP Configuration The router eigrp command The global command that enables eigrp is router eigrp autonomous-system -All routers in the EIGRP routing domain must use the same process ID number (autonomous-system number)
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1 23© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public Basic EIGRP Configuration The Network Command Functions of the network command –Enables interfaces to transmit & receive EIGRP updates –Includes network or subnet in EIGRP updates Example –Router(config-router)#network network-address
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1 24© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public Basic EIGRP Configuration The network Command with a Wildcard Mask -This option is used when you want to configure EIGRP to advertise specific subnets -Example Router(config-router)#network network-address [wildcard-mask]
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1 25© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public Basic EIGRP Configuration Verifying EIGRP EIGRP routers must establish adjacencies with their neighbors before any updates can be sent or received Command used to view neighbor table and verify that EIGRP has established adjacencies with neighbors is show ip eigrp neighbors
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1 26© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public EIGRP The show ip protocols command is also used to verify that EIGRP is enabled
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1 27© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public Basic EIGRP Configuration Examining the Routing Table The show ip route command is also used to verify EIGRP EIGRP routes are denoted in a routing table by the letter “D” By default , EIGRP automatically summarizes routes at major network boundary
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1 28© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public Basic EIGRP Configuration Introducing the Null0 Summary Route –Null0 is not a physical interface –In the routing table summary routes are sourced from Null0 Reason: routes are used for advertisement purposes –EIGRP will automatically include a null0 summary route as child route when 2 conditions are met At least one subnet is learned via EIGRP Automatic summarization is enabled
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1 29© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public Basic EIGRP Configuration R3’s routing table shows that the 172.16.0.0/16 network is automatically summarized by R1 & R3
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1 30© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public EIGRP Metric Calculation EIGRP 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
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1 31© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public EIGRP Metric Calculation Use the sh ip protocols command to verify the K values
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1 32© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public EIGRP Metric Calculation EIGRP Metrics Use the show interfaces command to view metrics EIGRP Metrics Bandwidth – EIGRP uses a static bandwidth to calculate metric Most serial interfaces use a default bandwidth value of 1.544Mbos (T1)
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1 33© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public 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
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1 34© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public EIGRP Metric Calculation Reliability (not a default EIGRP metric) -A measure of the likelihood that a link will fail -Measure dynamically & expressed as a fraction of 255 the higher the fraction the better the reliability Load (not a default EIGRP metric) – A number that reflects how much traffic is using a link – Number is determined dynamically and is expressed as a fraction of 255 The lower the fraction the less the load on the link
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1 35© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public EIGRP Metric Calculation Using the Bandwidth Command Modifying the interface bandwidth -Use the bandwidth command -Example Router(config-if)#bandwidth kilobits Verifying bandwidth –Use the show interface command Note – bandwidth command does not change the link’s physical bandwidth
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1 36© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public EIGRP Metric Calculation The EIGRP metric can be determined by examining the bandwidth delay
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1 37© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public EIGRP Metric Calculation EIGRP uses the lowest bandwidth (BW)in its metric calculation Calculated BW = reference BW / lowest BW(kbps) Delay – EIGRP uses the cumulative sum of all outgoing interfaces Calculated Delay = the sum of outgoing interface delays EIGRP Metric = calculated BW + calculated delay
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1 38© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public EIGRP Metric Calculation
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1 39© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public DUAL Concepts The Diffusing Update Algorithm (DUAL) is used to prevent looping
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1 40© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public DUAL Concepts Successor The best least cost route to a destination found in the routing table Feasible distance The lowest calculated metric along a path to a destination network
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1 41© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public DUAL Concepts Feasible Successors, Feasibility Condition & Reported Distance Feasible Successor -This is a loop free backup route to same destination as successor route
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1 42© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public DUAL Concepts Reported distance (RD) -The metric that a router reports to a neighbor about its own cost to that network Feasible Successors, Feasibility Condition & Reported Distance
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1 43© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public DUAL Concepts Feasibility Condition (FC) -Met when a neighbor’s RD is less than the local router’s FD to the same destination network
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1 44© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public DUAL Concepts Topology Table: Successor & Feasible Successor EIGRP Topology table –Viewed using the show ip eigrp topology command Contents of table include: – all successor routes – all feasible successor routes
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1 45© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public DUAL Concepts EIGRP Topology Table dissected
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1 46© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public DUAL Concepts Topology Table: No Feasible Successor A feasible successor may not be present because the feasibility condition may not be met -In other words, the reported distance of the neighbor is greater than or equal to the current feasible distance
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1 47© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public DUAL Concepts Finite Sate Machine (FSM) –An abstract machine that defines a set of possible states something can go through, what event causes those states and what events result form those states –FSMs are used to describe how a device, computer program, or routing algorithm will react to a set of input events
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1 48© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public DUAL Concepts DUAL FSM –Selects a best loop- free path to a destination –Selects alternate routes by using information in EIGRP tables
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1 49© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public DUAL Concepts Finite State Machines (FSM) To examine output from EIGRP’s finite state machine us the debug eigrp fsm command
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1 50© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public More EIGRP Configurations The Null0 Summary Route By default, EIGRP uses the Null0 interface to discard any packets that match the parent route but do not match any of the child routes EIGRP automatically includes a null0 summary route as a child route whenever both of the following conditions exist –One or subnets exists that was learned via EIGRP –Automatic summarization is enabled
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1 51© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public More EIGRP Configurations The Null0 Summary Route
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1 52© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public More EIGRP Configurations Disabling Automatic Summarization The auto-summary command permits EIGRP to automatically summarize at major network boundaries The no auto-summary command is used to disable automatic summarization –This causes all EIGRP neighbors to send updates that will not be automatically summarized this will cause changes to appear in both -routing tables -topology tables
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1 53© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public More EIGRP Configurations Manual Summarization Manual summarization can include supernets Reason: EIGRP is a classless routing protocol & include subnet mask in update Command used to configure manual summarization –Router(config-if)#ip summary-address eigrp as-number network-address subnet-mask
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1 54© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public More EIGRP Configurations Configuring a summary route in EIGRP
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1 55© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public More EIGRP Configurations EIGRP Default Routes “quad zero” static default route -Can be used with any currently supported routing protocol -Is usually configured on a router that is connected a network outside the EIGRP domain EIGRP & the “Quad zero” static default route –Requires the use of the redistribute static command to disseminate default route in EIGRP updates
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1 56© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public More EIGRP Configurations Fine-Tuning EIGRP EIGRP bandwidth utilization -By default, EIGRP uses only up to 50% of interface bandwidth for EIGRP information -The command to change the percentage of bandwidth used by EIGRP is Router(config-if)#ip bandwidth-percent eigrp as- number percent
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1 57© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public More EIGRP Configurations Configuring Hello Intervals and Hold Times -Hello intervals and hold times are configurable on a per-interface basis -The command to configure hello interval is Router(config-if)#ip hello-interval eigrp as-number seconds Changing the hello interval also requires changing the hold time to a value greater than or equal to the hello interval -The command to configure hold time value is Router(config-if)#ip hold-time eigrp as-number seconds
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1 58© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public Summary Background & History –EIGRP is a derivative of IGRP EIGRP is a Cisco proprietary distance vector routing protocol released in 1994 EIGRP terms and characteristics –EIGPR uses RTP to transmit & receive EIGRP packets –EIGRP has 5 packet type: Hello packets Update packets Acknowledgement packets Query packets Reply packets –Supports VLSM & CIDR
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1 59© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public Summary EIGRP terms and characteristics –EIGRP uses a hello protocol Purpose of hello protocol is to discover & establish adjacencies –EIGRP routing updates Aperiodic Partial and bounded Fast convergence
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1 60© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public Summary EIGRP commands –The following commands are used for EIGRP configuration RtrA(config)#router eigrp [autonomous-system #] RtrA(config-router)#network network-number –The following commands can be used to verify EIGRP Show ip protocols Show ip eigrp neighbors Show ip route
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1 61© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public Summary EIGRP metrics include –Bandwidth (default) –Delay (default) –Reliability –Load
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1 62© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public Summary DUAL –Purpose of DUAL To prevent routing loops –Successor Primary route to a destination –Feasible successor Backup route to a destination –Feasible distance Lowest calculated metric to a destination –Reported distance The distance towards a destination as advertised by an upstream neighbor
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1 63© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public Summary Choosing the best route –After router has received all updates from directly connected neighbors, it can calculate its DUAL 1st metric is calculated for each route 2nd route with lowest metric is designated successor & is placed in routing table 3rd feasible successor is found –Criteria for feasible successor: it must have lower reported distance to the destination than the installed route’s feasible distance –Feasible routes are maintained in topology table
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1 64© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public Summary Automatic summarization –On by default –Summarizes routes on classful boundary –Summarization can be disabled using the following command RtrA(config-if)#no auto-summary
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1 65© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public