What are the three phases of DMVPN?
In its simplest form, DMVPN is a point-to-multipoint Layer 3 overlay VPN enabling logical hub and spoke topology supporting direct spoke-to-spoke communications depending on DMVPN design ( Phase 1, Phase 2 and Phase 3 ) selection.
What is the difference between DMVPN Phase 2 and 3?
In Phase 2: The traffic goes through the hub until an IPsec tunnel has been formed between the two communicating spokes. In Phase 3: The traffic goes through the hub until the spoke gets an NHRP resolution and the CEF next-hop is overwritten/changed.
What is Nbma address in DMVPN?
Since mGRE is treated by NHRP as NMBA medium, logical IP corresponds to the IP address “inside” a tunnel (“inner”) and the NBMA IP address corresponds to the “outer” IP address (the IP address used to source a tunnel).
What is the difference between Dmvpn Phase 1 and 2 and 3?
Different DMVPN phases. DMVPN Phase I: This phase involves configuring a single mGRE interface on the hub, and all the spokes are still static tunnels so you won’t get any dynamic spoke-to-spoke connectivity. DMVPN Phase III: This phase expands on the scalability of the DMVPN network.
What is Dmvpn Cisco?
Dynamic Multipoint VPN (DMVPN) is Cisco’s answer to the increasing demands of enterprise companies to be able to connect branch offices with head offices and between each other while keeping costs low, minimising configuration complexity and increasing flexibility.
What is DMVPN Cisco?
What does Nbma stand for?
Non-broadcast multiple access
Non-broadcast multiple access (NBMA) is one of four network types in the Open Shortest Path First (OSPF) communications protocol. In an NBMA network all hosts are connected on a single network, but data is sent from one host directly to the next host and is not broadcast across to all hosts.
What is the configuration difference between Dmvpn Phase 1 and Dmvpn Phase 2 on the hub router?
The primary difference between DMVPN Phase I and DMVPN Phase II is that, in DMVPN Phase II, spoke routers are able to create dynamic tunnels with other spoke routers, whereas in DMVPN Phase I, they are not. The primary benefit of dynamic spoke-to-spoke tunnels is reduced traffic load on the hub router.
How to configure DMVPN Phase 2 and Phase 3?
The configuration of DMVPN phase 3 and 2 is very similar. Let’s start with the following DMVPN phase 2 configuration on all routers: To migrate from DMVPN phase 2 to 3, we only need two commands…here’s the first command: The NHRP redirect command on the hub will inform spoke routers that they can reach another spoke router directly.
What is DMVPN and how does it work?
Tunnels on spokes establish on demand based on traffic patterns without repeated configuration on hubs or spokes. In its simplest form, DMVPN is a point-to-multipoint Layer 3 overlay VPN enabling logical hub and spoke topology supporting direct spoke-to-spoke communications depending on DMVPN design ( Phase 1, Phase 2 and Phase 3 ) selection.
What are the different versions of DMVPN?
DMVPN supports three different versions called “phases”. In my first DMVPN lesson I explained the basics and the DMVPN phase 2 configuration and DMVPN phase 1 configuration lessons explain how to configure the first two phases.
How does DMVPN phase selection affect routing protocol configuration?
VPN Phase selection greatly affects routing protocol configuration and how it works over the logical topology. From a routing point of view, parallels between frame-relay routing and DMVPN routing protocol configurations are evident. DMVPN allows the creation of full mesh GRE or IPsec tunnels with a simple template of configuration.