350-401 Question 112
Single answerAn enterprise network is leveraging LISP (Locator/ID Separation Protocol) to optimize routing between its data centers and branch offices. The network administrator observes suboptimal routing and inconsistent application performance. Upon investigation, it is found that some devices are unable to differentiate between endpoint identifiers (EIDs) and routing locators (RLOCs). Which LISP component should the administrator verify to address this issue?
- A
LISP Map-Server and Map-Resolver configuration
- B
RLOC prioritization and weight settings
- C
EID-to-RLOC mapping database consistency
- D
Control Plane Policing (CoPP) for LISP traffic
Show answer and explanation
Correct answer: C
Explanation
The EID-to-RLOC mapping database is a critical component of LISP. It ensures that endpoint identifiers (EIDs) can be correctly mapped to routing locators (RLOCs). If this database is inconsistent or not properly maintained, devices will struggle to differentiate between EIDs and RLOCs, leading to suboptimal routing and application performance issues. Verifying the consistency of the EID-to-RLOC mapping database is essential to resolving the described problem.
- A. Incorrect.
A misconfiguration in the LISP Map-Server or Map-Resolver could cause issues with LISP mapping but would not directly lead to devices being unable to differentiate between EIDs and RLOCs.
- B. Incorrect.
RLOC prioritization and weight settings determine how traffic is forwarded to RLOCs but do not address the issue of devices failing to differentiate between EIDs and RLOCs.
- C. Correct.
EID-to-RLOC mapping database consistency is crucial for LISP to operate correctly. If mappings are inconsistent, devices may fail to properly distinguish between EIDs and RLOCs, leading to suboptimal routing.
- D. Incorrect.
Control Plane Policing (CoPP) for LISP traffic protects the control plane from excessive traffic but does not resolve issues related to EID and RLOC differentiation.