Learn the best EIGRP design approach to solve Stuck-In-Active problems in a large enterprise WAN environment, especially when acquiring another company also running EIGRP. Understand how deploying EIGRP stub routers with connected and summary options enabled provides an effective solution.
Table of Contents
Question
Refer to the exhibit, Company XYZ is a large enterprise network where the WAN traffic utilizes most of the link. The IT team in the company often reports Stuck-In-Active problems. The company is set to acquire another company that will also be running EIGRP and which will connect to the Company XYZ R3 and R4 routers. This acquisition could make the issue worse. Which design solution solves this problem?
A. Implement EIGRP Route Rap Dampening
B. Utilize the EIGRP unequal cost load-balancing feature on R5 and R6 to provide an interim solution
C. Advertise only the default route to R5 and R6 filtering all other routes
D. Deploy the EIGRP stub capability on R5 and R6 with the connected and summary options enabled
Answer
D. Deploy the EIGRP stub capability on R5 and R6 with the connected and summary options enabled
Explanation
The optimal design solution to address the Stuck-In-Active (SIA) problems being experienced by Company XYZ, particularly with the impending acquisition of another EIGRP-enabled company, is to deploy the EIGRP stub capability on routers R5 and R6 with the connected and summary options enabled (answer choice D).
Configuring R5 and R6 as EIGRP stub routers will prevent them from advertising large numbers of routes learned from the newly acquired company back into the core of Company XYZ’s WAN. Stub routers only advertise their directly connected networks and a summary of routes learned from their downstream neighbors.
This greatly reduces the query scope during an SIA event, as queries will not propagate to the stub routers. It minimizes unnecessary EIGRP traffic and contains SIA problems to smaller network segments.
The other options are less effective:
A) EIGRP Route Dampening does not directly address SIA issues
B) Unequal cost load-balancing is not a reliable long-term solution
C) Advertising only a default route could lead to suboptimal routing
Therefore, converting R5 and R6 into EIGRP stub routers with connected and summary options is the best way to proactively mitigate Stuck-In-Active problems in Company XYZ’s large enterprise WAN environment, especially with the upcoming corporate acquisition. This solution reduces query scope, minimizes EIGRP overhead, and logically contains SIA events.
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