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Routing & Switching · Advanced

DMVPN Phase 3

The DMVPN mode where the hub sends NHRP redirects and spokes install NHRP shortcut routes, allowing hub summarization.

Definition

In Phase 3 the hub can advertise only a summary or default route to spokes. When spoke-to-spoke traffic hairpins through the hub, the hub sends an NHRP redirect; the spokes then resolve each other and install shortcut routes that override the summary. It scales better than Phase 2 and supports hierarchical hubs.

Example

ip nhrp redirect on the hub tunnel; ip nhrp shortcut on spoke tunnels

Exam tip

Redirect goes on the hub, shortcut on the spokes; reversing them is a common distractor.

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