CCNA EIGRP Concepts — Dual Algorithm, Metrics & Configuration

What EIGRP Is and Why It Matters in 2026

Enhanced Interior Gateway Routing Protocol (EIGRP) is a Cisco-proprietary advanced distance-vector routing protocol that uses the Diffusing Update Algorithm (DUAL) to calculate loop-free paths and maintain backup routes in real time. Unlike RIP's hop-count limitation or OSPF's CPU-intensive SPF calculations, EIGRP combines fast convergence with minimal bandwidth overhead, making it the protocol of choice for enterprise campus networks across India—from Cisco India's Bengaluru headquarters to Aryaka's SD-WAN edge deployments. In 2026, EIGRP remains a core CCNA 200-301 exam objective and a daily reality for network engineers at HCL, Wipro, and TCS who manage multi-site MPLS and hybrid cloud topologies.

EIGRP's relevance persists because it scales efficiently to thousands of routes while consuming fewer router CPU cycles than link-state protocols. Cisco released named EIGRP configuration mode in IOS 15.0, simplifying multi-address-family deployments for IPv4, IPv6, and even legacy IPX networks. Although Cisco published EIGRP as an informational RFC (RFC 7868) in 2016, most vendors still treat it as Cisco-specific, so you'll encounter it primarily in Cisco-dominated environments—which describes 70% of Indian enterprise networks according to our placement data from 800+ hiring partners.

Understanding EIGRP's DUAL algorithm, composite metric calculation, and neighbor relationship mechanics is non-negotiable for CCNA certification and for junior network engineer roles paying ₹3.5-6 LPA in Bengaluru, Pune, and Hyderabad. Employers expect you to configure EIGRP autonomous systems, interpret topology tables, and troubleshoot stuck-in-active (SIA) routes during your first month on the job.

How EIGRP's DUAL Algorithm Works Under the Hood

The Diffusing Update Algorithm (DUAL) is EIGRP's finite state machine that guarantees loop-free routing at every instant. When a router loses its successor (best path) to a destination, DUAL checks whether a feasible successor (pre-qualified backup route) exists in the topology table. If one does, the router installs it into the routing table within milliseconds—no network-wide recalculation required. If no feasible successor exists, DUAL enters an active state and queries neighbors for alternate paths, a process that can take seconds and occasionally triggers SIA conditions if a neighbor fails to reply within three minutes.

DUAL maintains three tables: the neighbor table (adjacent EIGRP routers), the topology table (all learned routes with their metrics), and the routing table (best routes only). Each route in the topology table has a reported distance (RD)—the metric advertised by the neighbor—and a feasible distance (FD)—the total metric from the local router to the destination. The feasibility condition states that a route qualifies as a feasible successor only if its RD is less than the current FD of the successor route. This mathematical constraint prevents routing loops without requiring the router to track the entire path.

In our HSR Layout lab, we tested DUAL convergence by unplugging the primary uplink on a three-router topology. The downstream router switched to its feasible successor in 47 milliseconds—faster than a human can perceive. When we removed both paths simultaneously, the router entered active state and sent queries; convergence took 1.8 seconds, still acceptable for voice and video traffic. This behavior explains why Cisco India's campus networks prefer EIGRP for delay-sensitive applications over OSPF, which must run SPF across the entire area.

Successor and Feasible Successor Selection

The successor is the route with the lowest feasible distance and gets installed in the routing table. EIGRP can load-balance across up to 16 equal-cost successors (default is 4). A feasible successor is a backup route that meets the feasibility condition but has a higher FD than the successor. Feasible successors remain in the topology table, ready for instant promotion if the successor fails. If no feasible successor exists, DUAL must query neighbors, delaying convergence.

Active vs. Passive States

A route is passive when the router has a valid successor and is not querying neighbors. It transitions to active when the successor is lost and no feasible successor exists. The router sends query packets to all neighbors, who either reply with an alternate path or propagate the query further. If a neighbor doesn't reply within 180 seconds (the active timer), the router declares the neighbor dead and tears down the adjacency—this is the dreaded stuck-in-active condition that CCNP-level troubleshooting often targets.

EIGRP Composite Metric Calculation and K-Values

EIGRP's metric is a 32-bit composite value derived from bandwidth, delay, load, reliability, and MTU. By default, only bandwidth and delay are used (K1=1, K2=0, K3=1, K4=0, K5=0). The classic formula is: metric = 256 × [(10^7 / minimum bandwidth in kbps) + (sum of delays in tens of microseconds)]. For example, a path with 100 Mbps minimum bandwidth and 1000 microseconds total delay yields 256 × [(10,000,000 / 100,000) + 100] = 256 × 200 = 51,200.

Cisco introduced wide metrics in IOS 15.0 to accommodate 10 Gbps and faster links, scaling the formula by 65,536 instead of 256 and using a 64-bit metric field. The wide metric formula is: metric = [(K1 × minimum throughput × 65,536) + (K3 × total latency × 65,536)] × [K6 / (K4 + reliability)]. When K6=0 (default), the extended attributes are ignored, simplifying to throughput and latency only. Wide metrics prevent metric exhaustion on high-speed links but require all routers in the autonomous system to support them—mixing classic and wide metrics breaks adjacencies.

K-values must match between neighbors for an adjacency to form. If Router A uses K1=1, K3=1 and Router B uses K1=1, K2=1, K3=1, they will not become neighbors even if they're on the same subnet and share the same autonomous system number. This is a common CCNA lab mistake: students enable load-balancing by tweaking K-values on one router and wonder why the neighbor relationship fails. In production, Cisco TAC and our CCIE-level instructors recommend never changing K-values unless you have a specific QoS requirement and can verify consistency across all EIGRP speakers.

Bandwidth vs. Delay: Which Matters More?

Delay is often the deciding factor because bandwidth is typically uniform within a campus (all Gigabit Ethernet), but delay accumulates across serial WAN links or through multiple switch hops. A 1 Gbps link has a default delay of 10 microseconds; a T1 (1.544 Mbps) has 20,000 microseconds. When EIGRP compares two paths—one through three Gigabit switches (30 μs total delay) and another through a single T1 hop (20,000 μs)—the Gigabit path wins despite identical bandwidth at the final hop. Network engineers at Akamai India manipulate delay values on backup links to influence path selection without changing physical bandwidth, a technique you'll practice in any comprehensive CCNA course in Bangalore that includes hands-on EIGRP labs.

EIGRP Packet Types and Neighbor Relationships

EIGRP uses five packet types, all encapsulated directly in IP protocol 88 (not TCP or UDP). Hello packets (multicast to 224.0.0.10) discover and maintain neighbors; default hello interval is 5 seconds on high-speed links, 60 seconds on low-speed. Update packets carry routing information and are sent reliably (unicast or multicast with acknowledgment required). Query packets are sent when a route goes active and DUAL needs alternate paths. Reply packets respond to queries with route information or an unreachable message. Acknowledgment (ACK) packets are hello packets with no data, confirming receipt of reliable packets.

A neighbor relationship forms when two routers exchange hello packets and agree on autonomous system number, K-values, and authentication (if configured). The hold time—three times the hello interval by default—determines how long a router waits before declaring a neighbor dead. If Router A sends hellos every 5 seconds, Router B expects one every 15 seconds; missing four consecutive hellos triggers neighbor loss and route recalculation. In our 4-month paid internship at the Network Security Operations Division, freshers troubleshoot flapping EIGRP neighbors caused by WAN jitter or misconfigured hold timers—skills that directly transfer to roles at Cisco India, HCL, and Barracuda.

Reliable Transport Protocol (RTP)

EIGRP's RTP ensures updates, queries, and replies are delivered reliably without the overhead of TCP. Each reliable packet has a sequence number; the receiver sends an ACK with that sequence number. If the sender doesn't receive an ACK within the retransmission timeout (RTO), it resends the packet up to 16 times before declaring the neighbor unreachable. RTP allows EIGRP to multicast updates to multiple neighbors simultaneously while tracking individual ACKs, reducing convergence time compared to protocols that unicast every update.

EIGRP Configuration and CLI Examples

Basic EIGRP configuration in classic mode requires enabling the protocol, specifying an autonomous system number (1-65535), and advertising networks. The autonomous system number is locally significant—it doesn't need to match other routing domains—but must match on all routers within the same EIGRP domain. Here's a minimal configuration for a three-router campus:

Router(config)# router eigrp 100
Router(config-router)# network 10.0.0.0
Router(config-router)# network 192.168.1.0 0.0.0.255
Router(config-router)# no auto-summary

The network command uses classful boundaries by default unless you specify a wildcard mask. no auto-summary disables automatic summarization at classful boundaries, which is critical in modern networks with VLSM. Without it, EIGRP summarizes 10.1.1.0/24 and 10.2.1.0/24 into 10.0.0.0/8 at major network boundaries, causing black-hole routing.

Named EIGRP configuration, introduced in IOS 15.0, consolidates all settings under a single named instance and supports multiple address families (IPv4, IPv6) in one block:

Router(config)# router eigrp CAMPUS_EIGRP
Router(config-router)# address-family ipv4 unicast autonomous-system 100
Router(config-router-af)# network 10.0.0.0
Router(config-router-af)# af-interface GigabitEthernet0/0
Router(config-router-af-interface)# hello-interval 10
Router(config-router-af-interface)# hold-time 30
Router(config-router-af-interface)# exit
Router(config-router-af)# topology base
Router(config-router-af-topology)# variance 2

Named mode allows per-interface hello/hold timers and variance (for unequal-cost load balancing) within the same configuration block. The variance command multiplies the successor's FD; any feasible successor with an FD less than (successor FD × variance) is used for load balancing. Variance 2 means EIGRP will load-balance across paths up to twice the cost of the best path, distributing traffic proportionally by metric.

Passive Interfaces and Stub Routers

Use passive-interface to prevent EIGRP hellos on interfaces where no neighbors exist (e.g., user-facing VLANs). This reduces multicast traffic and prevents rogue routers from forming adjacencies:

Router(config-router)# passive-interface GigabitEthernet0/1
Router(config-router)# passive-interface default
Router(config-router)# no passive-interface GigabitEthernet0/0

EIGRP stub routing limits query propagation, reducing SIA risk in hub-and-spoke topologies. A stub router advertises only connected, summary, or static routes and never forwards queries to its neighbors:

Router(config-router)# eigrp stub connected summary

Stub configuration is mandatory at branch sites in Cisco SD-WAN and MPLS deployments—every network engineer hired by Aryaka or Movate must configure stub routers in their first week. This is a guaranteed CCNA exam question and a common interview topic for ₹4-7 LPA roles.

EIGRP vs. OSPF vs. RIP: When to Choose Which

EIGRP, OSPF, and RIP are the three IGPs covered in CCNA 200-301, each with distinct trade-offs. EIGRP converges faster than OSPF in most topologies because feasible successors eliminate the need for SPF recalculation, but OSPF is vendor-neutral and scales better in very large networks with hierarchical area design. RIP is obsolete for production but still appears on legacy networks and CCNA labs as a teaching tool for distance-vector fundamentals.

Choose EIGRP when you control the entire network infrastructure and use Cisco routers, need fast convergence with minimal configuration, or operate a hub-and-spoke WAN where stub routing simplifies design. Choose OSPF when you have a multi-vendor environment (Juniper, Arista, Cisco), require hierarchical summarization across areas, or need to integrate with MPLS service providers who mandate OSPF for CE-PE routing. Choose RIP never—unless you're maintaining a 20-year-old network that predates EIGRP and OSPF, or you're studying for the CCNA exam where RIP questions test your understanding of distance-vector loop prevention (split horizon, poison reverse, hold-down timers).

Common EIGRP Pitfalls and Interview Gotchas

CCNA candidates and junior engineers consistently stumble on five EIGRP issues. First, mismatched K-values prevent neighbor adjacencies even when AS numbers match and interfaces are on the same subnet. Always verify K-values with show ip protocols before troubleshooting further. Second, auto-summary enabled causes discontiguous subnets to black-hole traffic; always configure no auto-summary in classic mode (named mode disables it by default). Third, passive interfaces block hellos, so a router with all interfaces passive will never form neighbors—students often set passive-interface default and forget to exclude uplink interfaces.

Fourth, stuck-in-active (SIA) routes occur when a query propagates through a large network and a distant router fails to reply within 180 seconds. The querying router tears down the adjacency with the non-responsive neighbor, potentially causing a cascade of route flaps. Stub routing and route summarization limit query scope, preventing SIA in well-designed networks. Fifth, unequal-cost load balancing with variance can create asymmetric routing or microloops if not carefully planned; traffic may take Path A inbound and Path B outbound, breaking stateful firewall sessions.

In CCIE interviews and senior network engineer roles at Cisco India or Akamai, expect questions like: "How does EIGRP prevent routing loops without distance-vector mechanisms like split horizon?" (Answer: the feasibility condition ensures the neighbor's RD is less than your FD, guaranteeing the neighbor is upstream.) "Why would you use EIGRP over OSPF in a Cisco-only campus?" (Answer: faster convergence with feasible successors, simpler configuration, lower CPU overhead.) "Explain a scenario where EIGRP would enter active state despite having multiple neighbors." (Answer: all neighbors advertise routes with RD greater than or equal to the current FD, violating the feasibility condition.)

Troubleshooting EIGRP Neighbor Relationships

Use show ip eigrp neighbors to verify adjacencies. If a neighbor is missing, check: (1) IP connectivity with ping, (2) matching AS numbers with show ip protocols, (3) matching K-values, (4) authentication if configured, (5) whether the interface is passive, (6) ACLs blocking protocol 88. The show ip eigrp interfaces command reveals which interfaces are running EIGRP and their hello/hold timers. If neighbors flap (up/down repeatedly), investigate WAN link quality, duplex mismatches, or hold-time tuning.

Real-World EIGRP Deployment Scenarios in Indian Enterprises

Cisco India's Bengaluru campus uses EIGRP across 40+ buildings with a hub-and-spoke topology: core routers at the data center run full EIGRP, while access-layer switches use EIGRP stub to advertise only connected subnets. This design prevents queries from propagating to 800+ access switches, eliminating SIA risk. Route summarization at distribution routers reduces the topology table from 12,000 routes to 300, cutting memory usage and convergence time. Aryaka's SD-WAN edge appliances deploy EIGRP over IPsec tunnels to private data centers, with variance 2 load balancing across primary MPLS and backup internet circuits—traffic splits 70/30 based on metric ratios.

HCL's managed services division configures EIGRP authentication using MD5 key chains on customer WAN links to prevent rogue router injection, a requirement for PCI-DSS and ISO 27001 compliance. Barracuda's CloudGen Firewall integrates with Cisco routers via EIGRP to dynamically learn internal routes and update firewall policies, a setup our internship participants configure during their 4-month paid stint at the Network Security Operations Division. TCS and Wipro's global delivery centers use EIGRP for intra-site routing and BGP for inter-site, with mutual redistribution at the data center core—a hybrid design that balances EIGRP's fast convergence with BGP's policy control.

In 2026, EIGRP remains the default IGP for Cisco-centric enterprises in India because it requires less planning than OSPF (no area design), converges faster in typical campus topologies (sub-second with feasible successors), and integrates seamlessly with Cisco SD-WAN and DNA Center. Network engineers who master EIGRP configuration, metric tuning, and SIA troubleshooting command ₹5-9 LPA salaries in Bengaluru, Pune, and Hyderabad, with CCNP or CCIE credentials pushing that to ₹12-20 LPA.

How EIGRP Connects to CCNA, CCNP, and CCIE Syllabus

CCNA 200-301 dedicates approximately 8% of exam weight to EIGRP under the "IP Connectivity" domain. You must configure EIGRP for IPv4 and IPv6, interpret the topology and routing tables, explain DUAL operation, and troubleshoot neighbor adjacencies. Expect 4-6 questions, including simlets where you configure router eigrp, set passive interfaces, and verify neighbors with show commands. The exam tests classic configuration mode; named mode appears in CCNP but not CCNA.

CCNP Enterprise (ENCOR 350-401 and ENARSI 300-410) expands EIGRP coverage to named mode, wide metrics, route filtering with distribute lists and prefix lists, route summarization, authentication, and advanced troubleshooting (SIA, query scoping, EIGRP over DMVPN). ENARSI includes a 15-minute troubleshooting ticket where EIGRP misconfigurations (wrong AS number, mismatched K-values, passive interface on uplink) are common scenarios. CCNP candidates must also redistribute between EIGRP and OSPF or BGP, understanding how seed metrics and route tags prevent loops.

CCIE Enterprise Infrastructure v1.1 lab exam assumes EIGRP mastery: you'll configure named EIGRP with multiple address families, implement unequal-cost load balancing with variance, use offset lists to manipulate metrics, and integrate EIGRP with MPLS VPNs and SD-WAN overlays. The 8-hour lab includes a 3-hour troubleshooting module where EIGRP SIA, route filtering, and redistribution loops are deliberate faults you must diagnose and fix within minutes. Founder Vikas Swami, Dual CCIE #22239, architected QuickSDWAN to use EIGRP for underlay routing between edge nodes, a design pattern you'll study in our best CCNA course in Bangalore as preparation for CCNP and CCIE tracks.

EIGRP for IPv6 and Multi-Address-Family Configuration

EIGRP for IPv6 (EIGRPv6) operates similarly to IPv4 EIGRP but uses link-local addresses for neighbor relationships and advertises IPv6 prefixes. Configuration differs slightly: you enable EIGRPv6 per interface rather than globally advertising networks. Classic mode example:

Router(config)# ipv6 unicast-routing
Router(config)# ipv6 router eigrp 100
Router(config-rtr)# eigrp router-id 1.1.1.1
Router(config-rtr)# no shutdown
Router(config)# interface GigabitEthernet0/0
Router(config-if)# ipv6 eigrp 100

EIGRPv6 requires an explicit router ID (IPv4 format) and must be enabled with no shutdown under the routing process. Named mode simplifies dual-stack deployments by configuring IPv4 and IPv6 under the same EIGRP instance:

Router(config)# router eigrp DUAL_STACK
Router(config-router)# address-family ipv4 unicast autonomous-system 100
Router(config-router-af)# network 10.0.0.0
Router(config-router-af)# exit
Router(config-router)# address-family ipv6 unicast autonomous-system 100
Router(config-router-af)# exit
Router(config)# interface GigabitEthernet0/0
Router(config-if)# ip address 10.1.1.1 255.255.255.0
Router(config-if)# ipv6 address 2001:db8:1::1/64
Router(config-if)# no shutdown

Both address families share the same DUAL algorithm and topology table structure but maintain separate neighbor tables and routing tables. This is critical for enterprises migrating to IPv6 while maintaining IPv4 connectivity—Infosys and IBM's Indian data centers run dual-stack EIGRP to support legacy IPv4 applications and modern IPv6 services simultaneously.

EIGRP Authentication and Security Best Practices

EIGRP supports MD5 authentication (classic and named mode) and SHA-256 authentication (named mode only). Authentication prevents rogue routers from injecting false routes, a risk in shared data centers or co-location facilities. MD5 authentication uses key chains with key IDs and passwords:

Router(config)# key chain EIGRP_KEYS
Router(config-keychain)# key 1
Router(config-keychain-key)# key-string Cisco123
Router(config-keychain-key)# exit
Router(config)# interface GigabitEthernet0/0
Router(config-if)# ip authentication mode eigrp 100 md5
Router(config-if)# ip authentication key-chain eigrp 100 EIGRP_KEYS

SHA-256 authentication in named mode provides stronger cryptographic protection and is required for FIPS 140-2 compliance in government and financial networks:

Router(config)# router eigrp SECURE_EIGRP
Router(config-router)# address-family ipv4 unicast autonomous-system 100
Router(config-router-af)# af-interface GigabitEthernet0/0
Router(config-router-af-interface)# authentication mode hmac-sha-256 Cisco123

Key rotation is essential: configure multiple keys with overlapping accept and send lifetimes, allowing seamless password changes without downtime. RBI and SEBI guidelines for financial institutions mandate routing protocol authentication; network engineers at ICICI Bank, HDFC, and Axis Bank configure EIGRP authentication as part of baseline security hardening, a skill tested in our CCNA labs and reinforced during the 4-month paid internship.

Route Filtering and Summarization

Distribute lists filter routes in or out of the EIGRP topology table using ACLs or prefix lists. To prevent a router from advertising 192.168.10.0/24 to a specific neighbor:

Router(config)# access-list 10 deny 192.168.10.0 0.0.0.255
Router(config)# access-list 10 permit any
Router(config)# router eigrp 100
Router(config-router)# distribute-list 10 out GigabitEthernet0/1

Manual summarization reduces routing table size and query scope. Configure summary addresses on interfaces facing downstream routers:

Router(config)# interface GigabitEthernet0/0
Router(config-if)# ip summary-address eigrp 100 10.0.0.0 255.0.0.0

The summarizing router installs a discard route (Null0) for the summary prefix to prevent loops. If the router receives a packet for 10.5.5.5 but has no specific route, the Null0 entry drops it rather than forwarding it back upstream. Summarization is mandatory in large EIGRP deployments—Cisco TAC and our CCIE instructors recommend summarizing at distribution layer boundaries to keep core routing tables under 500 entries.

Frequently Asked Questions About CCNA EIGRP Concepts

What is the difference between feasible distance and reported distance in EIGRP?

Feasible distance (FD) is the total metric from the local router to the destination network, calculated as the reported distance from the neighbor plus the metric to reach that neighbor. Reported distance (RD) is the metric advertised by the neighbor—essentially the neighbor's FD for that route. The feasibility condition requires RD < FD of the successor to qualify a route as a feasible successor, ensuring the neighbor is not routing through you and preventing loops.

Why do EIGRP neighbors fail to form even when interfaces are on the same subnet?

Common causes include mismatched autonomous system numbers, mismatched K-values, one interface configured as passive, authentication mismatch, or an ACL blocking IP protocol 88. Use show ip eigrp neighbors to check adjacencies, show ip protocols to verify AS and K-values, and show ip interface to confirm the interface is not passive. If authentication is enabled, ensure key chains match exactly—key IDs and passwords are case-sensitive.

How does EIGRP prevent routing loops without split horizon?

EIGRP uses the feasibility condition: a route is accepted as a feasible successor only if the neighbor's reported distance is less than the local router's feasible distance to the current successor. This mathematical constraint guarantees the neighbor is upstream (closer to the destination) and not routing through the local router, preventing loops without needing split horizon. EIGRP does implement split horizon on multi-access networks, but the feasibility condition is the primary loop-prevention mechanism.

What is a stuck-in-active (SIA) route and how do you prevent it?

A route enters stuck-in-active state when a router sends a query and doesn't receive a reply from a neighbor within 180 seconds (the active timer). The router then tears down the adjacency with the non-responsive neighbor, potentially causing widespread route flaps. Prevent SIA by configuring stub routers at the network edge (limiting query propagation), summarizing routes at distribution boundaries (reducing the number of queries), and ensuring stable WAN links (so neighbors can reply promptly). Use show ip eigrp topology active to identify SIA routes during troubleshooting.

Can EIGRP load-balance across unequal-cost paths?

Yes, using the variance command. Variance is a multiplier applied to the successor's feasible distance; any feasible successor with an FD less than (successor FD × variance) is used for load balancing. For example, if the best path has FD 30720 and you configure variance 2, EIGRP will load-balance across all feasible successors with FD ≤ 61440. Traffic is distributed proportionally by metric: a path with FD 30720 carries twice the traffic of a path with FD 61440. Variance only affects feasible successors—routes that don't meet the feasibility condition are never used, even with high variance.

Should I use classic or named EIGRP configuration mode?

Use named mode for new deployments if all routers run IOS 15.0 or later. Named mode supports wide metrics (required for 10 Gbps+ links), simplifies multi-address-family configuration (IPv4 and IPv6 in one block), and allows per-interface timer and authentication settings within the routing process. Classic mode is sufficient for CCNA labs and legacy networks where routers run older IOS versions. Both modes interoperate—a router in named mode can peer with a router in classic mode as long as AS numbers and K-values match.

How does EIGRP integrate with SD-WAN and MPLS VPNs?

In SD-WAN deployments, EIGRP runs between edge routers and the SD-WAN controller or between edge routers over IPsec tunnels, providing dynamic routing for underlay or overlay networks. Cisco SD-WAN (Viptela) uses OMP (Overlay Management Protocol) for control plane but can redistribute EIGRP routes into OMP at the edge. In MPLS VPNs, EIGRP runs between customer edge (CE) and provider edge (PE) routers; the PE redistributes EIGRP into MP-BGP, which carries routes across the MPLS backbone. EIGRP's site-of-origin (SoO) extended community prevents routing loops when a customer has dual-homed sites. This is advanced CCNP/CCIE material but understanding the basics—EIGRP as CE-PE protocol—helps CCNA candidates grasp real-world WAN design.

Where can I practice EIGRP configuration hands-on before my CCNA exam?

Networkers Home's HSR Layout facility in Bengaluru offers 24×7 rack access with physical Cisco routers and switches running IOS 15.x, allowing you to configure classic and named EIGRP, test convergence with link failures, and troubleshoot SIA conditions in a production-like environment. Our CCNA course in Bangalore includes 40+ hours of hands-on labs covering EIGRP neighbor formation, metric tuning, variance configuration, and IPv6 dual-stack scenarios. You'll also access NHPREP.COM for 12 months, which includes EIGRP simlets identical to those on the CCNA 200-301 exam. Graduates receive an 8-month verified experience letter and placement support across 800+ hiring partners including Cisco India, Akamai, Aryaka, HCL, and Wipro, where EIGRP skills are tested in technical interviews for ₹3.5-7 LPA roles.