Cisco Systems 2.5 Advanced Configuration for the Tunnel Interface

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Cisco Router and Security Device Manager 2.5 User’s Guide
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Chapter15 DMVPN
Dynamic Multipoint VPN
Advanced Button
Cisco 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 se ttings.
Advanced Configuration for the Tunnel Interface
Use this window to configure GRE tunnel parameters. Cisco 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.
Cisco 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.
Cisco SDM Default: 100000
NHRP Hold Time
Enter the number of seconds that NHRP network IDs should be ad vertised as
valid.
Cisco SDM Default: 360