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DMVPN Configuration Recommendations
40-30
Cisco Router and Security Device Manager 2.5 User’s Guide
OL-4015-12
Recommendations for Configuring Routing Protocols for DMVPN
The following are guidelines that you should note when configuring routing
protocols for DMVPN. You can choose to ignore these guidelines, but Cisco SDM
has not been tested in scenarios outside the guidelines and may not be able to let
you edit configurations within Cisco SDM after you enter them.
These recommendations are listed in best-choice order:
•If a routing process exists that advertises inside networks, use this process to
advertise networks to the DMVPN.
•If a routing process exists that advertises tunnel networks for VPNs, for
example GRE over IPSec tunnels, use this process to advertise the DMVPN
networks.
•If a routing process exists that advertises networks for the WAN interfaces,
then be sure to use an AS number or process ID that the WAN interfaces do
not use to advertise networks.
•When you configure DMVPN routing information Cisco SDM checks
whether the Autonomous System number (EIGRP) or area ID (OSPF) you
enter is already used to advertise networks for the router’s physical interface.
If the value is already in use, Cisco SDM informs you of this and recommends
that you either use a new value, or that you select a different routing protocol
to advertise networks on the DMVPN.
Using Interfaces with Dialup Configurations
Selecting an interface that uses a dialup connection may cause the connection to
be always up. You can examine supported interfaces in Interfaces and
Connections to determine if a dialup connection, such as an ISDN or Async
connection has been configured for the physical interface you selected.
Ping the Hub Before You Start Spoke Configuration
Before configuring a spoke router, you should test connectivity to the hub by
issuing the ping command. If the ping does not succeed, you must configure a
route to the hub.