350-501 Question #554: Real Exam Question with Answer & Explanation

Question

What is the purpose of the origin code in the bgp path selection algorithm?

Options

• AIt indicates how the route was injected into the BGP process
• BIt specifies the router ID that originated the route
• CIt specifies the time for which the path has been in the BGP Routing table
• DIt indicates how the route was originated

Explanation

The BGP origin code indicates how a particular route was injected into the BGP routing process.

Common mistakes.

• B. The BGP origin code does not specify the router ID that originated the route; the BGP 'Originator ID' attribute or 'NEXT_HOP' attribute are used for related purposes.
• C. The BGP origin code does not specify the time for which the path has been in the BGP routing table; this information is part of the route's age or uptime, not its origin attribute.
• D. The statement 'It indicates how the route was originated' is vague; option A specifically states 'how the route was injected into the BGP process' which is a more precise technical explanation for the origin code's function distinguishing between IGP, EGP, or redistributed sources.

Concept tested. BGP origin attribute and path selection

Reference. https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/iproute_bgp/configuration/xe-3s/irr-xe-3s-book/bgp-att-origin.html

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