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Exam JN0-360 topic 3 question 171 discussion

Actual exam question from Juniper's JN0-360
Question #: 171
Topic #: 3
[All JN0-360 Questions]

Which role does the router ID (RID) have in the BGP route selection process?

  • A. The router ID is evaluated immediately after MED to determine route preference
  • B. The router ID is evaluated last in the route selection process
  • C. The router ID is evaluated after the cluster length and a lower router ID is chosen
  • D. The router ID is evaluated after analyzing the IGP metric cost
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Suggested Answer: C 🗳️

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DIbyam
3 years, 11 months ago
D is correct because BGP Path Attributes are Next-HOP, Weight, LP, Originate, AS-Path Length, Origin-Type, MED, Path(IGP>EGP), Next-Hop IGP Metric, Multipath, Age ,Router's ID, Minimum Cluster-List Length and Neighbor's IP Address(Lower)
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blackgreta
5 years, 4 months ago
so C is correct
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blackgreta
5 years, 4 months ago
The steps of the BGP selection algorithm are as follows: 1. The Next Hop attribute value for each route must be reachable in the local routing table; otherwise, the local router discards the route. 2. The router selects the route with the highest Local Preference attribute value. 3. The router selects the route with the shortest AS Path length. 4. The router selects the route with the smallest Origin attribute value. 5. The router selects the route with the smallest Multiple Exit Discriminator attribute value. This step is executed, by default, only for routes from the same neighboring AS. 6. The router selects routes learned from an EBGP peer over routes learned from an IBGP peer. If the remaining routes are all EBGP-learned routes, the router skips to step 9. 7. The router selects the route with the smallest IGP metric to the advertised BGP Next Hop. 8. If Route Reflection is used for IBGP peering, the router selects the route with the shortest Cluster-List length. 9. The router selects the route from the peer with the smallest numerical Router ID. 10. The router selects the route from the peer with the smallest numerical Peer Address.
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networkingcontrol
5 years, 4 months ago
RID is evaluated before cluster-ID
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