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EIGRP is a Cisco-proprietary advanced distance-vector routing protocol that combines features of both distance-vector and link-state protocols. It’s known for its rapid convergence and efficient bandwidth usage, making it ideal for enterprise networks.
You Should Know:
Basic EIGRP Configuration:
Router(config) router eigrp 10 Router(config-router) network 192.168.1.0 Router(config-router) network 10.0.0.0 Router(config-router) no auto-summary
Verifying EIGRP Neighbors:
Router show ip eigrp neighbors Router show ip eigrp interfaces
Checking EIGRP Topology Table:
Router show ip eigrp topology
Passive Interface Configuration:
Router(config-router) passive-interface FastEthernet0/0
EIGRP for IPv6 Configuration:
Router(config) ipv6 unicast-routing Router(config) ipv6 router eigrp 10 Router(config-rtr) router-id 1.1.1.1 Router(config-rtr) no shutdown Router(config) interface GigabitEthernet0/0 Router(config-if) ipv6 eigrp 10
Metric Calculation Components:
Router(config-router) metric weights 0 1 1 1 1 1
Load Balancing:
Router(config-router) variance 2
Bandwidth Utilization Control:
Router(config-if) bandwidth 10000 Router(config-if) ip bandwidth-percent eigrp 10 50
Stub Routing Configuration:
Router(config-router) eigrp stub connected summary
Troubleshooting Commands:
Router debug eigrp packets Router debug ip eigrp Router show ip protocols Router show ip route eigrp
What Undercode Say:
EIGRP remains a powerful routing protocol despite being Cisco-proprietary, with its DUAL algorithm providing loop-free paths and fast convergence. The protocol’s efficient use of bandwidth through partial updates and its support for both IPv4 and IPv6 make it relevant in modern networks. Key administrative distances (90 for internal, 170 for external) and metric calculation using bandwidth and delay (by default) are critical concepts. For optimal performance, always properly configure bandwidth values on interfaces and consider using stub routing in hub-and-spoke topologies. EIGRP’s ability to perform unequal-cost load balancing through variance commands adds to its flexibility in complex network designs.
Expected Output:
References:
Reported By: Nasir Amin – Hackers Feeds
Extra Hub: Undercode MoN
Basic Verification: Pass ✅
