You try to configure MPLS VPN VRF Selection based on a source IP address on an interface that has VRF configured, but you receive an error. Which action must you take to correct the problem?

Question

Options

• AChange the source IP address.
• BAdd the IP address to the VRF table.
• CRemove the VRF from the interface.
• DConfigure static routes for the VRF.

• A
  8% (3)
• B
  3% (1)
• C
  84% (31)
• D
  5% (2)

Explanation

Removing the VRF from the interface is required because VRF Selection based on source IP is a dynamic classification feature that must operate on an interface in the global routing table - it cannot coexist with a statically assigned VRF on the same interface. The router uses source IP to decide which VRF to use at packet arrival, but if the interface already belongs to a specific VRF, that decision is already made and the feature has nowhere to act, resulting in a configuration error.

Why the distractors are wrong:

• A (Change source IP): The error is a configuration conflict, not an IP address problem - changing the source address doesn't resolve the mutual exclusivity.
• B (Add IP to VRF table): The issue is at the interface level, not a missing entry in a VRF routing table.
• D (Configure static routes): Static routes are unrelated to the error; routing within the VRF is a separate concern from selecting which VRF to use.

Memory tip: Think "dynamic selection requires a blank slate" - the interface must be in the global table (no VRF assigned) so the source-IP policy can dynamically assign the VRF per packet. A pre-assigned VRF kills the dynamic choice.

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