Common questions

What is the difference between DMVPN Phase 2 and 3?

author 0

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 are the steps to configure the DMVPN?

Four Steps to Fully Configure Cisco DMVPN

  1. Configure the DMVPN Hub.
  2. Configure the DMVPN Spoke(s)
  3. Protect the mGRE tunnels with IPSecurity (optional)
  4. Configure Routing Between DMVPN mGRE Tunnels (static routing or routing protocol)

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 are the 3 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 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 ports does DMVPN use?

DMVPN uses the NHRP (Next Hop Resolution Protocol) technology to analyze the end address of VPN Tunnel in the Hub-And- Spoke under the network environment; and uses the Multipoint GRE Tunnel port to establish Multipoint GRE over IPSec VPN Tunnel. DMVPN is based on IPSec VPN and GRE VPN.

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 do I configure FlexVPN?

  1. Enable AAA.
  2. Define the local subnets to be encrypted.
  3. Create the IKEv2 Keyring.
  4. Create the IKEv2 Authorization Policy.
  5. Create the IKEv2 Profile.
  6. Create the IPSec Profile.
  7. Create the tunnel interface.
  8. Create the FlexVPN Client Profile.

Is DMVPN a Layer 2?

DMVPN is based on underlying layer-3 connectivity between the sites (called Spokes) and head end (called Hub). Sites/spokes register and resolve connectivity for networks at each site via the Hub. For this hub and spokes use the Next Hop Resolution Protocol (NHRP) which is specified in RFC-2332.

What are the basic DMVPN Phase 1 configurations?

As a high level configuration on R1 we can see the basic configurations for DMVPN phase 1. The first two commands shown create a GRE tunnel and sets the VPN address and is nothing new to DMVPN configurations. no ip redirects – Disables ICMP Redirects on this interface.

What is aboveabove in DMVPN Phase 2?

Above is a trace to the hub of the DMVPN. It should always be one hop away regardless of the DMVPN phase. Spoke-to-spoke traffic flows will always flow through the hub first in DMVPN phase 1. In DMVPN phase 2 spoke to spoke traffic flows is now permitted and all spoke routers implement multipoint GRE.

Is there a lab file for DMVPN configuration?

We’re only focusing on DMVPN here. This means that we’re not going to investigate dynamic routing (there will be a future article on this later), or adding IPSec. Lab files are available for download if you want to see the initial configuration. We’re going to look at the configuration for each DMVPN phase.

What is the DMVPN Phase 2 policy for spoke-to-spoke traffic flows?

Spoke-to-spoke traffic flows will always flow through the hub first in DMVPN phase 1. In DMVPN phase 2 spoke to spoke traffic flows is now permitted and all spoke routers implement multipoint GRE. Equally, resolution request NHRP messages are now sent to resolve a spokes VPN address to it’s NBMA address.

author

Back to Top