7 EIGRP Flashcards
What algorithm does EIGRP use?
DUAL diffusing update algorithm
What is a successor route?
The route with the lowest path metric to reach a destination
What is a Successor?
The first next-hop router for the successor route
What is Feasible Distance?
The metric value for the lowest-metric path to reach a desination
What is Reported Distance?
Distance reported by a router to reach a prefix. It is the feasible distance for a advertising router
What is a Feasibility condition?
The RD must be less than the FD calculated locally
What is a Feasible successor?
A route that satisfies the feasible condition
What is a vital component to DUAL?
The EIGRP topology table
What is in the topology table? (four)
- Network prefix
- EIGRP neighbors
- Metrics from echt neighbor
- Values used for calculating the metric
What is the topology tables P or A
Passive = active Active = computing a new path
What is the EIGRP IP?
88
How does EIGRP communicate?
Through multicast 224.0.0.10
How many type of packets doe EIGRP uses?
- Hello
- Request - to get specific information
- Update - to transmit routing and reachability
- Query - sent out search for another path
- Reply - sent in response to a query packet
What is ECMP?
Equal Cost MultiPathing
How to calculate the variance value?
Feasible distance x variance multiplier
How to calculate the variance multiplier?
Feasible successor metric / successor route metric
How long is the EIGRP Hello timer?
5 seconds (60 on slow speed link)
How long is EIGRP Hold timer?
3x Hello timer (180 on slow speed link)
For what is DUAL used within EIGRP?
To identify network paths and enable fast convergence using pre calculated loop-free back up paths
