300-415 Question #301: Real Exam Question with Answer & Explanation

The correct answer is A: Enable Originate.. To enable a WAN Edge router to function as an ASBR and facilitate summary route calculation in an OSPF domain, the 'Originate' option must be enabled in its OSPF advanced configuration.

WAN Edge Router Deployment

Question

Refer to the exhibit. A network administrator is configuring OSPF advanced configuration parameters from a template using the vManage GUI for a branch WAN Edge router to calculate the summary routes to an ASBR. Which action achieves this configuration?

Options

AEnable Originate.
BDisable RFC 1583 Compatible.
CDisable Originate.
DEnable RFC 1583 Compatible.

Explanation

To enable a WAN Edge router to function as an ASBR and facilitate summary route calculation in an OSPF domain, the 'Originate' option must be enabled in its OSPF advanced configuration.

Common mistakes.

B. Disabling RFC 1583 Compatible mode affects how external routes are preferred in specific multi-area scenarios but does not directly enable the router to originate summary routes as an ASBR.
C. Disabling the 'Originate' option would prevent the WAN Edge router from acting as an ASBR and injecting external routes into OSPF, which contradicts the requirement to contribute to summary route calculation.
D. Enabling RFC 1583 Compatible mode relates to specific OSPF external route calculation rules and is not the mechanism for an ASBR to originate routes or summaries.

Concept tested. OSPF ASBR functionality and route origination

Reference. https://www.cisco.com/c/en/us/td/docs/routers/sdwan/configuration/sdwan-xe-gs-book/sdwan-config-routing.html

Topics

#OSPF#Route Summarization#WAN Edge#vManage

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