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Routing & Switching · Advanced

Next Hop Resolution Protocol (NHRP)

A protocol that maps overlay tunnel addresses to underlay NBMA addresses, acting like ARP for DMVPN.

Definition

Spokes register their tunnel-to-public-address mapping with the hub, which acts as the next hop server (NHS). When a spoke needs another spoke, NHRP resolution requests allow it to learn the remote public address and build a direct tunnel. NHRP redirect and shortcut enable DMVPN Phase 3.

Example

ip nhrp nhs 172.16.0.1 nbma 203.0.113.1 multicast

Exam tip

The hub is the NHS and spokes are NHCs; NHRP network-id must be configured on each tunnel.

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