How to troubleshoot EIGRP metrics and EIGRP for IPv6?

With the approach of higher rate interfaces and terabit switches, the quantity of fast "multi-gigabit" interface arrangements has been developing quickly, as the current pattern in the systems administration industry is solidification. It is getting to be progressively basic to send Fast Ether channel, Gigabit Ether channel, 10 Gigabit Ethernet, or even 100 Gigabit Ether channel all through the grounds center. Of course, Enhanced Interior Gateway Routing Protocol (EIGRP) picks a course focused around least way data transmission and aggregate deferral, however in the past the recipe that processes these qualities loses determination on single connections or Ether channel connects over two gigabit. This paper will examine how EIGRP has been changed to handle these higher connection speeds. This record portrays how to make a favored course by impacting Enhanced Interior Gateway Routing Protocol (EIGRP) measurements. Given the topology demonstrated in the system graph, this record portrays a few approaches to impact IP activity from the customers to the servers so that the way R1>r2>r3 is favored. The objective is to make the way R1>r2>r4 into a reinforcement that is just utilized as a part of the occasion of a disappointment at R3.

There are a few routines for setting a favored course by affecting EIGRP measurements. This archive depicts these systems and subtle elements their preferences and hindrances. This archive likewise talks about the impact of altering data transfer capacity, despite the fact that doing so is not a practical method for modifying the way. Improved Interior Gateway Routing Protocol (EIGRP) is a progressed separation vector directing convention that is utilized on a machine system to help computerize steering choices and design. The convention was outlined by Cisco Systems as a restrictive convention, accessible just on Cisco switches, yet Cisco changed over it to an open standard in 2013. EIGRP permits a switch to impart data it thinks about the system with neighboring switches inside the same sensible zone known as an independent framework. As opposed to other well known steering conventions, for example, directing data convention, EIGRP just imparts data that a neighboring switch would not have, instead of sending every last bit of its data. EIGRP is enhanced to help lessen the workload of the switch and the measure of information that needs to be transmitted between switches.

Routing Protocols

The Enhanced and Interior Gateways for Routing Protocol supplanted the Interior Gateway Routing Protocol (IGRP) in 1993. One of the significant purposes behind this was on the grounds that the configuration of the Internet Protocol had been changed to backing awkward Ipv4 addresses, which IGRP couldn't support. Just about all switches contain a steering table that contains governs by which movement is sent in a system. In the event that the switch does not contain a substantial way to the goal, the movement is tossed. EIGRP is an element steering convention by which switches consequently impart course data. This facilitates the workload on a system executive who does not need to arrange progressions to the steering table physically. Notwithstanding the directing table, EIGRP utilizes the accompanying tables to store data: Neighbor Table: The neighbor table keeps a record of the IP locations of switches that have an immediate physical association with this switch. Switches that are joined with this switch in a roundabout way, through an alternate switch are not recorded in this table as they are not considered neighbors.

Topology Table: The topology table stores courses that it has gained from neighbor steering tables. Dissimilar to a steering table, the topology table does not store all courses, yet just courses that have been dictated by EIGRP. The topology table likewise records the measurements for each of the recorded EIGRP courses, the doable successor and the successors. Courses in the topology table are stamped as "inactive" or "dynamic". Uninvolved shows that EIGRP has decided the way for the particular course and has completed the process of preparing. Dynamic characteristics show that EIGRP is as of now attempting to compute the best way for the particular course. Courses in the topology table are not usable by the switch until they are embedded into the steering table. The topology table is never utilized by the switch to forward activity. Courses in the topology table won't be embedded into the steering table on the off chance that they are dynamic, are a possible successor, or have a higher managerial separation than a comparable path.

Data in the topology table may be embedded into the switch's directing table and can then be utilized to forward movement. On the off chance that the system changes, for instance, a physical connection comes up short or is disengaged; the way will get to be inaccessible. EIGRP is intended to distinguish these progressions and will endeavor to discover another way to the goal. The old way that is no more accessible is expelled from the steering table as it is no more accessible. Dissimilar to most separation vector steering conventions, EIGRP does not transmit all the information in the switch's directing table when a change is made yet will just transmit the changes that have been made since the directing table was last upgraded. EIGRP does not send its steering table intermittently, yet will just send directing table information when a real change has happened. This conduct is more in line with connection state steering conventions; therefore EIGRP is for the most part considered a half and half convention.

EIGRP metric Composite Formula

EIGRP truly has utilized five vector measurements: least throughput, inactivity, burden, dependability, and Maximum Transmission Unit (MTU). These qualities are collected from terminus to source as takes after:

  • Throughput-least esteem
  • Latency-collective
  • Load-most extreme
  • Reliability-least
  • MTU-least
  • Hop number aggregate: To this, there are two extra values being included: jitter and vitality. These two new values are collected from terminus to source:
  • Jitter-aggregate
  • Energy-aggregate

These developed traits, and any future ones, will be controlled through K6. In the event that K6 is non-zero, these will be an added substance to the way's composite metric. Higher jitter or higher vitality utilization will bring about ways which are more terrible than those ways that either doesn't screen these characteristics, or which have lower values. EIGRP won't send these characteristics if the switch does not give them. On the off chance that the characteristics are gotten, then EIGRP will utilize them within the metric figuring (focused around K6) and will forward them with that switch's qualities, thought to be "zero", and the collective qualities will be sent unaltered.

Computing Metric

Of these vector metric parts, of course, just least throughput and dormancy are generally used to register the best way. Not at all like most measurements, least throughput is situated to the base estimation of the whole way, and it doesn't reflect what number of bounces or low throughput connections are in the way, nor does it reflect the accessibility of parallel connections. Idleness is figured focused around restricted postponements, and is an aggregate worth, which increments with each one sec.

The Eigrp_rib_scale esteem has just LOCAL importance, as EIGRP does not promote the composite worth. This permits switches with "higher velocity connections" to utilize a more diminutive scaling, supporting the determination of speedier connections at the present of slower connections. The utilization of contrasting scales on diverse switches at redistribution focuses would bring about the "outer information" demonstrating distinctive qualities; however these qualities are not utilized for directing choices and are esteemed corrective.

At the point when figuring the metric utilizing the units over, all limit data will be standardized to kilobytes and picoseconds before being utilized. Case in point, deferral is communicated in microseconds for every kilobyte, and would be changed over to kilobytes for every second; moreover vitality would be communicated in force for every kilo bytes for every second of use.

Transfer speed Formulation

Interfaces at present report transfer speed in units of kilobytes/second. This worth will be utilized as may be, and no change of this quality will be performed when encoding in parcels being sent between companions.

Delay Formulation

For IOS interfaces that don't surpass 1 gigabit, this worth will be inferred from the reported interface postponement, changed over to picoseconds. This incorporates deferral qualities exhibit in design based summons (i.e. interface postponement, redistribute, default-metric, course delineate).

EIGRP for IPv6

Clients can arrange Enhanced Interior Gateway Routing Protocol (EIGRP) to course Ipv6 prefixes. EIGRP Ipv4 runs over an Ipv4 transport, corresponds just with Ipv4 peers, and publicizes just Ipv4 courses, and EIGRP for Ipv6 takes after the same model. EIGRP for Ipv4 and EIGRP for Ipv6 are arranged and oversaw independently. Then again, the setup of EIGRP for Ipv4 and Ipv6 is comparable and gives operational commonality and coherence.

EIGRP is an improved form of the IGRP created by Cisco. EIGRP utilizes the same separation vector calculation and separation data as IGRP. On the other hand, the joining properties and the working effectiveness of EIGRP have enhanced significantly over IGRP.

The joining engineering is focused around exploration led at SRI International and utilizes a calculation called the diffusing redesign calculation (DUAL). This calculation certifications circle free operation at each moment all through a course reckoning and permits all gadgets included in a topology change to synchronize in the meantime. Gadgets that are not influenced by topology progressions are not included in recompilations.

EIGRP gives the accompanying gimmicks:

Expanded system width- -With Routing Information Protocol (RIP), the biggest conceivable width of your system is 15 jumps. At the point when EIGRP is empowered, the biggest conceivable width is 224 bounces. Since the EIGRP metric is substantial enough to help a large number of bounces, the main obstruction to growing the system is the vehicle layer bounce counter. Cisco lives up to expectations around this confinement by increasing the vehicle control field just when an Ipv4 or an Ipv6 bundle has navigated 15 gadgets and the following jump to the goal was adapted by method for EIGRP. At the point when a RIP course is, no doubt utilized as the following jump to the end, the vehicle control field is increased not surprisingly.

Fractional upgrades -EIGRP sends incremental redesigns when the state of a terminus changes, as opposed to sending the whole substance of the directing table. This peculiarity minimizes the data transfer capacity needed for EIGRP bundles.

Neighbor revelation instrument -This is a basic hi component used to research neighboring gadgets. It is convention autonomous.

Scaling- -EIGRP scales to extensive systems.

Course separating -EIGRP for Ipv6 gives course sifting utilizing disseminate rundown prefix-list command. Utilization of the course guide charge is not backed for course separating with a circulate list.

EIGRP has the accompanying four essential segments for configuring and troubleshooting

Neighbor revelation -Neighbor disclosure is the process that gadgets utilization to powerfully learn of different gadgets on their straightforwardly connected systems. Gadgets should likewise find when their neighbors get to be inaccessible or defective. EIGRP neighbor revelation is accomplished with low overhead by occasionally sending little hi bundles. EIGRP neighbors can likewise find a neighbor that has recuperated after a blackout in light of the fact that the recouped neighbor will convey a welcome bundle. The length of hi bundles are gotten; the Cisco programming can verify that a neighbor is alive and working. When this status is dead set, the neighboring gadgets can trade steering data.

Solid transport convention -The dependable transport convention is in charge of ensured, requested conveyance of EIGRP parcels to all neighbors. It backings intermixed transmission of multicast and unicast bundles. Some EIGRP bundles must be sent dependably and others require not be. For effectiveness, unwavering quality is given just when important. Case in point, on a multi access organize that has multicast capacities, it is not important to send hi parcels dependably to all neighbors separately. In this way, EIGRP sends a solitary multicast hi with an evidence in the bundle illuminating the collectors that the parcel require not be recognized. Different sorts of parcels, (for example, upgrades) oblige affirmation, which is demonstrated in the bundle. The solid transport has a procurement to send multicast bundles immediately when unacknowledged parcels are pending. This procurement serves to guarantee that union time stays low in the vicinity of differing pace joins.

Double limited state machine- -The DUAL limited state machine typifies the choice methodology for all course processing's. It tracks all courses publicized by all neighbors. Double uses a few measurements including separation and expense data to choose effective, circle freeways. At the point when various courses to a neighbor exist, DUAL figures out which course has the most reduced metric (named the plausible separation), and enters this course into the steering table. Other conceivable courses to this neighbor with bigger measurements are gotten, and DUAL decides the reported separation to this system. The reported separation is characterized as the aggregate metric promoted by an upstream neighbor for a way to a terminus. Double contrasts the reported separation and the practical separation, and if the reported separation is short of what the doable separation, DUAL considers the course to be an achievable successor and enters the course into the topology table. To abstain from steering circles, DUAL guarantees that the reported separation is constantly short of what the achievable separation for a neighbor gadget to achieve the objective system; overall, the course to the neighbor may circle once again through the nearby gadget.

Convention subordinate modules- -When there are no plausible successors to a course that has fizzled, however there are neighbors publicizing the course, a recompilation must happen. This is the procedure in which DUAL decides another successor. The measure of time needed to recompute the course influences the union time. Recompilation is processor-serious; it is focal point


ExamCollection Premium

ExamCollection Premium Files

Pass your Exam with ExamCollection's PREMIUM files!

  • ExamCollection Certified Safe Files
  • Guaranteed to have ACTUAL Exam Questions
  • Up-to-Date Exam Study Material - Verified by Experts
  • Instant Downloads
Enter Your Email Address to Receive Your 10% Off Discount Code
A Confirmation Link will be sent to this email address to verify your login
We value your privacy. We will not rent or sell your email address


Use Discount Code:


A confirmation link was sent to your e-mail.
Please check your mailbox for a message from and follow the directions.


Download Free Demo of VCE Exam Simulator

Experience Avanset VCE Exam Simulator for yourself.

Simply submit your e-mail address below to get started with our interactive software demo of your free trial.

Free Demo Limits: In the demo version you will be able to access only first 5 questions from exam.