350-501 · Question #98
Refer to the exhibit. A network operator working for service provider with an employee id 3715 15:021 applied this configuration to a router. Which additional step should the engineer use to enable…
The correct answer is C. Enable MPLS LDP on the interface. To enable LDP (Label Distribution Protocol) on a router after enabling MPLS globally, it is essential to configure LDP specifically on the interfaces that participate in MPLS forwarding.
Question
Refer to the exhibit. A network operator working for service provider with an employee id 3715 15:021 applied this configuration to a router. Which additional step should the engineer use to enable LDP?
Options
- ADisable Cisco Express Forwarding globally
- BDelete the static router ID
- CEnable MPLS LDP on the interface
- DConfigure the both keyword to enable LDP globally
How the community answered
(14 responses)- B7% (1)
- C86% (12)
- D7% (1)
Why each option
To enable LDP (Label Distribution Protocol) on a router after enabling MPLS globally, it is essential to configure LDP specifically on the interfaces that participate in MPLS forwarding.
Cisco Express Forwarding (CEF) is a prerequisite for MPLS to function correctly, so disabling it would prevent LDP and MPLS from working.
A router ID is required for LDP and other routing protocols, so deleting it would hinder LDP operation, not enable it.
Even if MPLS is globally enabled, LDP must be explicitly enabled on specific interfaces to begin exchanging labels and establishing LDP sessions with neighbors. This is typically done using the mpls ip or mpls ldp autoconfig command under the interface configuration.
There is no 'both' keyword to enable LDP globally; LDP must be enabled per-interface for adjacency formation.
Concept tested: MPLS LDP interface configuration
Source: https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/mpls/configuration/xe-16/mp-xe-16-book/mp-ldp-ov.html
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