Chapter11 DMVPN
Edit Dynamic Multipoint VPN (DMVPN)
11-18
Cisco Router and Security Device Manager Version 2.2 User’s Guide
OL-4015-08
RIP Fields
If you selected RIP as the dynamic routing protocol, select Version 1, Vers ion 2,
or Default. If you select Version 2, the router will include the subnet mask in the
routing update. If you select Default, the router will send out Version 2 updates,
but it will be able to receive RIP Version 1 or Version 2 updates.
Turn off split horizon—If this is the hub router, check this box to turn off split
horizon on the mGRE tunnel interface. Turning off split horizon allows the router
to advertise the routes that it has learned from the tunnel interface out the same
interface.
OSPF Fields
If you selected OSPF, the following fields must be completed:
OSPF process ID—Enter the process ID. This value identifies the OSPF process
to other routers. See Recommendations for Configuring Routing Protocols for
DMVPN.
OSPF Network Type—Select point-to-multipoint or broadcast.
Point-to-multipoint causes OSPF to add routes to the routing table on spoke
routers. If you wish to avoid this, you can select broadcast.
OSPF Priority—The OSPF priority identifies this router as a hub or as a spoke.
If this is a hub router, enter a priority value of 2. If this is a spoke router, enter a
priority value of 0.
EIGRP Fields
If you selected EIGRP, the following fields must be completed:
Autonomous System Number—Enter the Autonomous System Number for the
group of routers using EIGRP. Routers with the same EIGRP autonomous system
number maintain a topological database of routers in the region identified by that
number. See Recommendations for Configuring Routing Protocols for DMVPN.
Turn off split horizon—If this is the hub router, check this box to turn on split
horizon on the mGRE tunnel interface. Leave it unchecked to disable split
horizon. Turning off split horizon allows the router to advertise the routes that it
has learned from the tunnel interface out the same interface.
Use original next hop— If this is a DMVPN hub router, EIGRP will advertise
this router as the next hop. Check this box to have EIGRP use the original IP next
hop when advertising routes to the DMVPN spoke routers.