
When configuring [DMVPN](/dmvpn), one of the fundamental configurations that are applied at both the hub and the spokes are the [NHRP](/nhrp) mappings.  These mappings can be either static or dynamic.

On Spokes, these mappings are static (since they only map the hub(s)) while on the hub the mappings are dynamic because there are many spokes, and those can be added and removed.  For example, on a spoke, we would see this:

```
Spoke1(config-if)#ip nhrp map 172.16.123.1 192.168.123.1
```

On the hub we would see the following command applied:

```
Hub(config-if)#ip nhrp map multicast dynamic
```

Spokes only require static mappings since they use the hub to resolve the next hop IP, however, the hub needs mappings because the routing is dynamic.

Note that this is the case only for Phase 2 and Phase 3.

## Links

https://networklessons.com/cisco/ccie-enterprise-infrastructure/dmvpn-phase-2-basic-configuration

DMVPN - mappings on hub and spokes

Cloud service models - SaaS

CoPP - Best practices and operation

Configuration Register

Control Plane Policing (CoPP)

Control Plane Protection

DHCP - Broadcast flag

DHCP - Cisco Client ID format

DHCP - Client ID

DHCP - Commonly used options for IP phones

DHCP - DHCPv6 and the default gateway

DHCP - How a host is identified by a remote DHCP server

DHCP - Message Types

DHCP - Options

DHCP - Static binding use cases

DHCP - Understanding the Magic Cookie

DHCP - Using the MAC as the client ID on a Cisco device

DHCP Auto Image Update support

DHCP DORA process

DHCP Request message sent as broadcast

DHCP Snooping on a multi-switch topology

DHCP client options on Cisco IOS

DHCP decline message

DHCP excluding address on a Cisco IOS DHCP server

DHCP multiple IP helper-addresses

DHCP multiple servers on the same subnet

DHCP offer message sent as broadcast

DHCP option 82

DHCP relay agent

DHCP relay support for MPLS VPN

DHCP renewal rebinding

DHCP snooping rate limiting best practice

DHCP trusted and untrusted ports

DHCP

DHCPv6 - Modes of Operation

DHCPv6 - determining the IPv6 prefix assigned to an interface

DHCPv6 lease times on a Cisco IOS device

DHCPv6 relay agent

DMVPN - Dual-Hub Single-Cloud with redundant spoke links config guidelines

DMVPN - IPsec encryption order of operations

DMVPN - NHRP purge request

DMVPN - NHRP session attributes

DMVPN - OSPF and multiple areas

DMVPN - Phase 2 BGP peerings

DMVPN - Phase 2 EIGRP neighbor adjacencies

DMVPN - Phase 2 OSPF neighbor adjacencies

DMVPN - Phase 2 and multicast traffic

DMVPN - Phase 2 and summarization

DMVPN - Using the GRE tunnel key

DMVPN - What is the best routing protocol to use

DMVPN - multicast commands

DMVPN - nhrp map and nhs command syntax

DMVPN - spoke redundancy

DMVPN - using a default route

DMVPN Dual Cloud Path Selection Using IGP Metrics

DMVPN State of a tunnel

DMVPN dual hub dual cloud

DMVPN dual hub single cloud

DMVPN hierarchical topology

DMVPN redundancy options

DMVPN with more than two hubs

DMVPN

DNS - Authoritative Flag

DNS - Authoritative Server

DNS - Caching

DNS - Recursive Resolver

DNS - What is a delegation zone

DNS - stub zone

DNS - understanding zones

DNS cache windows PC

DSL - Asymmetric Digital Subscriber Line (ADSL)

DTP - Sending of Frames

DTP - best practice to disable

DTP - how to disable

Debug Condition Command Restrictions in Cisco IOS

Debug IP Routing

Decrypt IPSec ESP traffic with Wireshark

Demand Circuits

Demarcation point

Difference between per-prefix LFA and per-link based LFA

Differences between CCIE and CCDE lab exams

Diffserv recommended configuration

Distribute-lists - using route maps to set attributes

Distribute-lists and named extended ACLs

ECMP Multicast Routing Cisco Nexus Switches

EEM - action mail

EEM - exit status variable

EEM Cisco Embedded Event Manager

EEM Matching a string within CLI output

EEM sync and skip keywords

EIGRP - Advertised metric is cumulative

EIGRP - Advertising a route using the network command

EIGRP - DUAL Algorithm and FD Set to Infinity

EIGRP - External routes from different ASes

EIGRP - Feasible Successors and the DUAL Algorithm

EIGRP - Hello interval and Hold time

EIGRP - Hop Count