EIGRP provides a mechanism to load balance over unequal cost paths throungh Variance Command. Variance is a number (1 to 128), multiplied by the local best metric then includes the routes with the lesser or equal metric. The default Variance value is 1, which means equal-cost load balancing.
Similarly, it is asked, what does Eigrp use to determine routes?
EIGRP uses the Diffusing-Update Algorithm (DUAL) to determine the most efficient (least cost) route to a destination. A DUAL finite state machine contains decision information used by the algorithm to determine the least-cost route (which considers distance and whether a destination path is loop-free).
Also Know, does Eigrp load balance by default? EIGRP load balancing By default, EIGRP supports equal-cost load balancing over four links. Equal-cost means that multiple routes must have the same metric to reach the destination, so that router can choose to load balance across equal cost links.
In this regard, what is FD in Eigrp?
The Feasible Distance (FD) is the distance from the current router to the destination router. Feasibility Condition (Requirement) Within EIGRP there is requirement which must be met for a route to be considered feasible and loop-free.
What type of load balancing does Eigrp?
EIGRP Load Balancing. Every routing protocol supports equal cost path load balancing. The default is 1, which means equal cost load balancing. Traffic is also distributed among the links with unequal costs, proportionately, with respect to the metric.
19 Related Question Answers Found
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.
What is the use of Eigrp?
Enhanced Interior Gateway Routing Protocol (EIGRP) is an advanced distance-vector routing protocol that is used on a computer network for automating routing decisions and configuration. The protocol was designed by Cisco Systems as a proprietary protocol, available only on Cisco routers.
Is Eigrp proprietary?
EIGRP is a routing protocol that is proprietary to Cisco. Although Cisco submitted a portion of EIGRP to the IETF for consideration as a potential standard, the entire protocol has not been accepted as a standard and remains proprietary to Cisco.
What is Eigrp topology table?
A topology table is used by routers that route traffic in a network. Each router using the routing protocol EIGRP then maintains a topology table for each configured network protocol — all routes learned, that are leading to a destination are found in the topology table. EIGRP must have a reliable connection.
What are the four basic components of Eigrp?
EIGRP has four basic components: Neighbor Discovery/Recovery. Reliable Transport Protocol. DUAL Finite State Machine. Protocol Dependent Modules.
How do I set up Eigrp?
To configure EIGRP in the Cisco IOS, just follow these steps: Set the bandwidth on your interfaces using the bandwidth command. Start the EIGRP routing process and specify your AS number. Once you are through this stage, next step is to instruct the router in order to advertise the networks that are directly linked to it.
What is dual Eigrp?
The diffusing update algorithm (DUAL) is the algorithm used by Cisco’s EIGRP routing protocol to ensure that a given route is recalculated globally whenever it might cause a routing loop. It was developed by J.J. Garcia-Luna-Aceves at SRI International.
How does Eigrp calculate feasible distance?
feasible distance: Best metric among all path to a network. It is calculated by adding the advertised/reported distance advertised by the neighbor and the cost calculated by that current router to reach the neighbor. successor: It is the (lowest) best path to reach to any specific destination network.
How does Eigrp work?
With EIGRP, two routers form a neighbor relationship and exchange routes. Hello packets (“keepalives”) are present between the two routers; they serve to let each side know if the other goes down or if the link between them goes down. Typically, these keepalives between neighbors are multicast packets.
What is successor Eigrp?
A successor is the route with the best metric to reach a destination. That route is stored in the routing table. A feasible successor is a backup path to reach that same destination that can be used immediately if the successor route fails. These backup routes are stored in the topology table.
What is Eigrp feasibility condition?
Feasibility Condition. The Feasibility Condition states that a route will not be accepted if the Reported Distance is more than the best path’s Feasible Distance. Or said another way and from the perspective of the router: a path to a network will not be accepted if my neighbor’s cost is more than my cost.
What is feasible distance?
Feasible distance (FD) – the local router’s metric of the best route to reach a specific network. The metric is calculated using the metric reported by the neighbor (the advertised distance) plus the metric to the neighbor reporting the route. The route with the lowest FD will be placed in the routing table.
Is Eigrp better than OSPF?
EIGRP is also less confusing than OSPF because it does not have different network types and EIGRP is easier to deploy in hub and spoke scenarios. OSPF can only summarize between areas. OSPF is link state so it has a better view of the entire network than EIGRP before it runs the SPF algorithm.
What is Eigrp administrative distance?
Administrative distance. Administrative distance number is used by routers to find out which route is better (lower number is better). For example, if the same route is learned from RIP and EIGRP, a Cisco router will choose the EIGRP route and stores it in the routing table.
How is Eigrp metric calculated?
EIGRP uses these scaled values to determine the total metric to the network: metric = ([K1 * bandwidth + (K2 * bandwidth) / (256 – load) + K3 * delay] * [K5 / (reliability + K4)]) * 256.
Where are Eigrp successor routes stored?
Successor routes are saved in the topology table to be used if the primary route fails. Successor routes are flagged as “active” in the routing table. A successor route may be backed up by a feasible successor route. Successor routes are stored in the neighbor table following the discovery process.
What is ad value?
Administrative Distance (AD) is a value that routers use in order to select the best path when there are two or more different routes to the same destination from two different routing protocols. Administrative Distance (AD) is a numeric value which can range from 0 to 255.
How does Eigrp calculate variance?
EIGRP provides a mechanism to load balance over unequal cost paths throungh Variance Command. Variance is a number (1 to 128), multiplied by the local best metric then includes the routes with the lesser or equal metric. The default Variance value is 1, which means equal-cost load balancing.
How do I enable multicast routing?
Perform these configurations to enable multicast routing on a router: Issue the ip multicast-routing command globally on the router. Enable PIM sparse or dense mode, by issuing the ip pim sparse-dense-mode command on all the multicast interfaces. In the case of sparse mode, a Rendezvous Point (RP) is to be configured.