What is EIGRP terminology?
EIGRP sends out five different types of packets—hello, update, query, reply, and acknowledge (ACK)—that are used to establish the initial adjacency between neighbors and to keep the topology and routing tables current.
What is AD and FD in EIGRP?
The Advertised Distance (AD) is the distance from a given neighbor to the destination router. Feasible Distance. The Feasible Distance (FD) is the distance from the current router to the destination router. Feasibility Condition (Requirement)
What is EIGRP definition and how it works?
Enhanced Interior Gateway Routing Protocol (EIGRP) is a network protocol that enables routers to exchange information more efficiently than earlier network protocols, such as Interior Gateway Routing Protocol (IGRP) or Border Gateway Protocol (BGP).
What are the three main data structures used by EIGRP?
EIGRP stores its operational data, configured parameters, and statistics in three main data structures:
- Interface table:
- Neighbor table:
- Topology table:
What is ASN in EIGRP?
Autonomous system number. A number that uniquely identifies a particular autonomous system. An ASN is used in the exchange of exterior routing information between neighboring autonomous systems. (Also, see EIGRP process number .)
What is K value in EIGRP?
K values are integers from 0 to 128; these integers, in conjunction with variables like bandwidth and delay, are used to calculate the overall EIGRP composite cost metric.
How is Fd calculated in EIGRP?
The FD is calculated by adding our neighbor’s RD to the metric required to reach our neighbor. Therefore, if we add the EIGRP metric between routers R1 and R2 to router R2’s RD, we get the FD (that is, the total distance) required for R1 to get to the 10.1.
What is EIGRP poison reverse?
“Poison reverse is another way of avoiding routing loops. Its rule states: Once you learn of a route through an interface, advertise it as unreachable back through that same interface.”
Is is Intermediate System Intermediate System?
The IS-IS (Intermediate System – Intermediate System) protocol is one of a family of IP Routing protocols, and is an Interior Gateway Protocol (IGP) for the Internet, used to distribute IP routing information throughout a single Autonomous System (AS) in an IP network.
Why EIGRP is hybrid protocol?
EIGRP is called a hybrid protocol because is uses metrics from both distance vector protocols and link state protocols. Configuration of EIGRP on a Cisco router is similar to enabling other routing processes. All that needs to be done to start EIGRP on a Cisco router is to define an EIGRP routing process.
What type of routing is EIGRP?
EIGRP is a distance vector & Link State routing protocol that uses the diffusing update algorithm (DUAL) (based on work from SRI International) to improve the efficiency of the protocol and to help prevent calculation errors when attempting to determine the best path to a remote network.
Why EIGRP is called hybrid protocol?
What is split horizon in EIGRP?
When split horizon is enabled, any route learned from an interface is not advertised back out the same interface. This rule is intended to stop routing loops with distance-vector protocols. To enable split-horizon for EIGRP, specify the EIGRP as-number . With most interfaces, split horizon is enabled.
What is MTU in EIGRP?
MTU stands for Maximum Transmission Unit. It is advertised with the routing update but does not actively participate in the metric calculation. EIGRP uses it when the number of similar cost paths to the same destination exceeds the number of allowed paths.
How does EIGRP calculate FD and RD?
The FD is calculated by adding our neighbor’s RD to the metric required to reach our neighbor. Therefore, if we add the EIGRP metric between routers R1 and R2 to router R2’s RD, we get the FD (that is, the total distance) required for R1 to get to the 10.1. 1.8 /30 via router R2.
What is route poisoning in EIGRP?
Route poisoning is a method that prevents a certain network from sending data packets to a path destination that has already become invalid. This is done when a distance vector routing protocol sees an invalid route or one with large routing loops. A route is considered unreachable if it exceeds the maximum allowed.