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Cisco Router and Security Device Manager 2.5 User’s Guide
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Chapter15 DMVPN
Edit Dynamic Multipoint VPN (DMVPN)

Statically configure the IP-to-NMBA address mapping of IP destinations connected to an NBMA network.

Click this button if you are configuring a spoke in a fully meshed network. Cisco
SDM treats backup hubs as spokes to primary hubs, so also click t his if you are
configuring a backup hub. In this part of the window you are providing the address
information that the spoke or backup hub needs to contact the primary hub.
Destination Reachable through NBMA network—Enter the IP address of the
mGRE tunnel configured on the primary hub. Spokes and backup hubs use this
tunnel information to establish contact with the hub and create an mGRE tunnel
to it. Spokes use the tunnel to send encrypted data to the hub and to query the hub
for next hop information to other spokes.
NBMA Address directly reachable— Enter the static IP Address of the interface
on the primary hub that supports the mGRE tunnel.

Configure NBMA addresses used as destinations for broadcast or multicast packets to be sent over a

tunnel network.

Use this area of the window to provide information used by routing protocols.
Dynamically add spokes’ IP addresses to hub’s multicast cache—Configure
this option if you are configuring a primary or a backup hub. This option is needed
by the hub to send routing updates to all connected DMVPN spokes.
IP address of NBMA address directly reachable—If you are configuring a
spoke in a full meshed DMVPN, or a backup hub, check this box, and provide the
static IP Address of the interface on the primary hub that supports the mGRE
tunnel.
Routing Panel
Use this panel to configure routing information for the DMVPN cloud.

Routing Protocol

Select the dynamic routing protocol that the hub and spoke route rs in this
DMVPN use to perform routing. Note that all the routers in the DMVPN must be
configured for the routing protocol that you select.
•RIP—Routing Internet Protocol
•OSPF—Open Shortest Path First