Nhrp - Cradlepoint AER3100 User Manual

User Manual / AER3100/AER3150

NHRP

Next Hop Resolution Protocol is a protocol
used to discover addresses of clients on
Non-Broadcast Multiple Access (NBMA)
networks. It is used to create next-
generation VPN technologies that allow
shortcutting between spokes. With NHRP,
systems attached to an NBMA network
dynamically learn the NBMA address of
the other systems that are part of that network, allowing these systems to directly communicate without
requiring an intermediate hop.
NOTE: NHRP Configuration requires a feature license not included with ECM Prime. Go to SYSTEM >
Administration > Feature Licenses to enable this feature.
The NHRP Supported Interfaces table displays the following fields for each configured NHRP interface:
• Name: Name of the GRE tunnel that NHRP will use
• Protocol Address/Prefix: GRE tunnel endpoint mapping that NHRP associates with the NBMA server
• NBMA Address: NBMA server address the protocol address/prefix is associated with
• Flags:
• SD: Shortcut-Destination
• N: Non-Caching
• S: Shortcut
• R: Redirect
Click Add to create a new NHRP interface.
• Enabled: Enable or disable the interface.
• Name: Give the interface a unique name that
matches the mGRE (multipoint GRE) tunnel.
Select from configured GRE tunnels or input
manually.
• Peer Authentication: Embeds the secret
plaintext password to outgoing NHRP
packets. Incoming NHRP packets on this
interface are discarded unless this password
is present. Max length: eight characters.
• Holding Time: Specifies the holding time for
NHRP registration requests and resolution
replies.
• Shortcut-Destination: Reply with
authoritative answers on NHRP resolution
requests destined to addresses in this
interface (instead of forwarding the packets).
• Non-Caching: Disables caching of peer
information from forwarded NHRP resolution
reply packets.
• Shortcut: Enable creation of shortcut routes.
• Redirect: Enable sending of proprietary enterprise-style NHRP traffic indication packets.
• Multicast: Determines how multicast packets should be forwarded through NHRP interfaces.
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