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Cisco Router and Security Device Manager Version 2.2 User’s Guide
OL-4015-08
Chapter11 DMVPN
Dynamic Multipoint VPN

Advanced Button

SDM provides default values for advanced tunnel settings. However, the hub
administrator must decide on the tunnel settings and give them to the personnel
administering spoke routers so that they can make matching settings.
Advanced Configuration for the Tunnel Interface
Use this window to configure GRE tunnel parameters. SDM provides default
values, but you must obtain the correct values from the hub administrator and
enter them here.
The default values are provided in this help topic. If you change from the default,
and need to restore it, consult this help topic.

NHRP Authentication String

Enter the string that DMVPN hubs and spokes must use to authenticate
themselves for NHRP transactions. The string can be up to 8 characters long.
Special characters such as spaces, question marks (?) are not allowed. All devices
in the DMVPN must be configured with the same authentication string.
SDM Default: DMVPN_NW

NHRP Network ID

Enter the NHRP Network ID. The network ID is a globally unique, 32-bit network
identifier for a nonbroadcast, multiaccess (NBMA) network. The range is 1 to
4294967295.
SDM Default: 100000

NHRP Hold Time

Enter the number of seconds that NHRP network IDs should be ad vertised as
valid.
SDM Default: 360