Eigrp
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EIGRP is a Cisco proprietary distance vector routing protocol that uses the Diffusing Update Algorithm (DUAL) to determine the best route to a destination. It has an administrative distance of 90 internally and 170 externally and uses a composite metric that factors bandwidth, delay, reliability, load and MTU to calculate the best path. EIGRP configuration involves enabling the protocol on interfaces and networks, tuning metric weights, summarization, authentication, and timers. Troubleshooting commands display interface, neighbor, topology and traffic information to identify issues.
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![packetlife.net
by Jeremy Stretch v2.1
EIGRP
Protocol Header
Type
Attributes
Algorithm
Internal AD
External AD
Distance Vector
DUAL
90
170
Summary AD
Standard
Protocols
Transport
5
Cisco proprietary
IP, IPX, Appletalk
IP/88
Version Opcode Checksum
8 16 24 32
Flags
Sequence Number
Acknowledgment Number
Autonomous System Number
Type Length
Value
Authentication
Multicast IP
Hello Timers
Hold Timers
MD5
224.0.0.10
5/60
15/180
Metric Formula
256 * (K1 * bw + + K3 * delay) *
K2 * bw
256 - load
K5
rel + K4
· bw = 107
/ minimum path bandwidth in kbps
· delay = interface delay in µsecs / 10
EIGRP Configuration
! Enable EIGRP
router eigrp <ASN>
! Add networks to advertise
network <IP address> <wildcard mask>
! Configure K values to manipulate metric formula
metric weights 0 <k1> <k2> <k3> <k4> <k5>
! Disable automatic route summarization
no auto-summary
! Designate passive interfaces
passive-interface (<interface> | default)
! Enable stub routing
eigrp stub [receive-only | connected | static | summary]
! Statically identify neighoring routers
neighbor <IP address> <interface>
Protocol Configuration
! Set maximum bandwidth EIGRP can consume
ip bandwidth-percent eigrp <AS> <percentage>
! Configure manual summarization of outbound routes
ip summary-address eigrp <AS> <IP address> <mask> [<AD>]
! Enable MD5 authentication
ip authentication mode eigrp <AS> md5
ip authentication key-chain eigrp <AS> <key-chain>
! Configure hello and hold timers
ip hello-interval eigrp <AS> <seconds>
ip hold-time eigrp <AS> <seconds>
! Disable split horizon for EIGRP
no ip split-horizon eigrp <AS>
Interface Configuration
K Defaults Packet Types
K1 1
K2 0
K3 1
K4 0
K5 0
1 Update
3 Query
4 Reply
5 Hello
8 Acknowledge
Terminology
Feasible Distance
The distance advertised by a neighbor plus the cost
to get to that neighbor
Reported Distance
The metric for a route advertised by a neighbor
Stuck In Active (SIA)
The condition when a route becomes unreachable
and not all queries for it are answered; adjacencies
with unresponsive neighbors are reset
Passive Interface
An interface which does not participate in EIGRP but
whose network is advertised
Stub Router
A router which advertises only a subset of routes,
and is omitted from the route query process
Troubleshooting
show ip eigrp interfaces
show ip eigrp neighbors
show ip eigrp topology
show ip eigrp traffic
clear ip eigrp neighbors
debug ip eigrp [packet | neighbors]](https://image.slidesharecdn.com/eigrp-150324021916-conversion-gate01/85/Eigrp-1-320.jpg)
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Eigrp
EIGRP is a proprietary distance vector routing protocol developed by Cisco that uses DUAL algorithm. It provides fast convergence using neighbor adjacencies, variable length subnet masking, and supports authentication using MD5. The metric formula takes bandwidth, delay, reliability, load, and MTU into consideration to determine the best path. EIGRP configuration allows tuning of K values, summarization, stub routing, authentication, and interface settings. Troubleshooting commands include show ip eigrp to display neighbor, topology, and traffic information.
Eigrp
EIGRP is a proprietary distance vector routing protocol developed by Cisco that uses DUAL algorithm. It provides fast convergence using neighbor adjacencies, variable length subnet masking, and supports authentication using MD5. The metric formula uses bandwidth, delay, reliability, load, and MTU to calculate the best path and can be customized using K values. EIGRP configuration involves enabling it on interfaces, redistributing routes, tuning timers, and troubleshooting with show commands.
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Eigrp Cheatsheet - EIGRP in 15 min - Rishabh Dangwal - www.theprohack.com
EIGRP is a hybrid routing protocol that uses DUAL algorithm. It supports IP, IPX and Appletalk and uses reliable transport protocol. EIGRP has internal administrative distance of 90 and external of 170. It uses hello packets, update packets, query packets and reply packets. The default metric is based on bandwidth and delay. EIGRP can experience stuck in active issues if queries are not responded to within timers. EIGRP stub routing allows selective route advertisement.
EIGRP (enhanced interior gateway routing protocol)
EIGRP is a cisco proprietary, Advance distance vector, classless Interior gateway routing protocol.
Released in-1994.
It works on Network Layer of OSI Model.
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EIGRP AD – 90
Eigrp External routes AD – 170
EIGRP has a maximum hop-count of 224, though the default maximum hop-count is set to 100
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EIGRP and OSPF are routing protocols. EIGRP uses the DUAL algorithm and metric to select fast, loop-free routes. It supports multiple network layers and rapid convergence. OSPF is an open standard link-state protocol that provides a common network view and calculates the shortest path. It can route between autonomous systems and uses link state updates and SPF algorithm. Configuring OSPF involves assigning networks to areas and defining the routing process. Verification includes checking neighbors, routes, and topology tables.
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EIGRP and OSPF are routing protocols. EIGRP uses the DUAL algorithm and metric to select fast, loop-free routes. It supports multiple network layers and rapid convergence. OSPF is an open standard link-state protocol that provides a common network view and calculates the shortest path. It can route between autonomous systems and uses link state updates and SPF algorithm. Configuring OSPF involves assigning networks to areas and defining the routing process. Verification includes checking neighbors, routes, and topology tables.
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The document discusses implementing and configuring the EIGRP routing protocol. It describes EIGRP features such as flexible network design, multicast routing, support for VLSM and discontiguous subnets. It also covers EIGRP configuration, metrics, load balancing, authentication and commands for verifying EIGRP operation.
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IGRP and EIGRP.
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Protocol Dependent Modules (PDM).
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EIGRP is an advanced distance-vector routing protocol created by Cisco that uses the Diffusing Update Algorithm (DUAL) to calculate paths and back-up paths. It establishes neighbor adjacencies, uses reliable transport to deliver packets to neighbors, and sends partial and bounded updates only when there is a change.
Dynamic routing
Static routing is inflexible and cannot adapt to network changes, while dynamic routing automatically adapts to topology changes. Dynamic routing protocols include distance vector protocols like RIP that use hop counts as metrics and link-state protocols like OSPF that use link costs. These protocols exchange routing information to build and maintain routing tables and converge on consistent views of the network topology.
CCNA (R & S) Module 04 - Scaling Networks - Chapter 6
The document discusses EIGRP (Enhanced Interior Gateway Routing Protocol) and how to implement it for IPv4 and IPv6 routing. It covers the key characteristics and features of EIGRP, including how it uses the Diffusing Update Algorithm (DUAL) to calculate paths and establish neighbor adjacencies. It also provides instructions on configuring EIGRP for IPv4 and IPv6 on Cisco routers, and describes commands to verify proper operation and troubleshoot issues.
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Eigrp
EIGRP is an advanced distance vector routing protocol created by Cisco that uses the Diffusing Update Algorithm to calculate paths and backup paths. It establishes neighbor adjacencies, uses reliable transport for packet delivery, and sends partial and bounded updates only when there are changes.
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Eigrp
- 1. packetlife.net by Jeremy Stretch v2.1 EIGRP Protocol Header Type Attributes Algorithm Internal AD External AD Distance Vector DUAL 90 170 Summary AD Standard Protocols Transport 5 Cisco proprietary IP, IPX, Appletalk IP/88 Version Opcode Checksum 8 16 24 32 Flags Sequence Number Acknowledgment Number Autonomous System Number Type Length Value Authentication Multicast IP Hello Timers Hold Timers MD5 224.0.0.10 5/60 15/180 Metric Formula 256 * (K1 * bw + + K3 * delay) * K2 * bw 256 - load K5 rel + K4 · bw = 107 / minimum path bandwidth in kbps · delay = interface delay in µsecs / 10 EIGRP Configuration ! Enable EIGRP router eigrp <ASN> ! Add networks to advertise network <IP address> <wildcard mask> ! Configure K values to manipulate metric formula metric weights 0 <k1> <k2> <k3> <k4> <k5> ! Disable automatic route summarization no auto-summary ! Designate passive interfaces passive-interface (<interface> | default) ! Enable stub routing eigrp stub [receive-only | connected | static | summary] ! Statically identify neighoring routers neighbor <IP address> <interface> Protocol Configuration ! Set maximum bandwidth EIGRP can consume ip bandwidth-percent eigrp <AS> <percentage> ! Configure manual summarization of outbound routes ip summary-address eigrp <AS> <IP address> <mask> [<AD>] ! Enable MD5 authentication ip authentication mode eigrp <AS> md5 ip authentication key-chain eigrp <AS> <key-chain> ! Configure hello and hold timers ip hello-interval eigrp <AS> <seconds> ip hold-time eigrp <AS> <seconds> ! Disable split horizon for EIGRP no ip split-horizon eigrp <AS> Interface Configuration K Defaults Packet Types K1 1 K2 0 K3 1 K4 0 K5 0 1 Update 3 Query 4 Reply 5 Hello 8 Acknowledge Terminology Feasible Distance The distance advertised by a neighbor plus the cost to get to that neighbor Reported Distance The metric for a route advertised by a neighbor Stuck In Active (SIA) The condition when a route becomes unreachable and not all queries for it are answered; adjacencies with unresponsive neighbors are reset Passive Interface An interface which does not participate in EIGRP but whose network is advertised Stub Router A router which advertises only a subset of routes, and is omitted from the route query process Troubleshooting show ip eigrp interfaces show ip eigrp neighbors show ip eigrp topology show ip eigrp traffic clear ip eigrp neighbors debug ip eigrp [packet | neighbors]