350-501 Question #210: Real Exam Question with Answer & Explanation

Question

After implement MPLS protocol for multiple VRFs on a single Cisco device, the engineer notices all VRFs on the router still do to not LDP session protection feature enabled. When configuration must the engineer apply to enable the LDP session protection feature FOR LDP neighbors within each VRF?

Options

• AConfigure LDP session protection globally on the device only.
• BConfigure LDP session protection globally on the device and on each neighbor that requires
• CConfigure LDP session authentication on the device to enable LDP session protection on each
• DConfigure LDP session protection within the individual VRFs.

Explanation

This question asks for the specific configuration required to enable the LDP session protection feature for LDP neighbors within individual VRFs on a Cisco device with multiple VRFs.

Common mistakes.

• A. Configuring LDP session protection globally would not apply the feature to LDP neighbors operating within specific VRFs, as VRF-aware LDP requires per-VRF configuration for many features.
• B. While some features might require both global and per-neighbor configuration, LDP session protection for VRFs is typically managed directly within the VRF's LDP configuration, making a separate global setting plus per-neighbor redundant or incorrect for this specific scenario.
• C. LDP session authentication is a security feature to authenticate LDP peers and is distinct from LDP session protection, which is designed to maintain sessions during interface disruptions; authentication does not enable protection.

Concept tested. LDP session protection in VRFs

Reference. https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/mp_ldp/configuration/15-mt/mp-ldp-15-mt-book/mp-ldp-oview.html

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