Spokes router will be using a client configuration block, which allows it to dynamically select tunnel source and destination addresses based on ip slas and. A survey on dynamic multipoint virtual private networks. The initial customer configuration consists of a single dmvpn cloud with a single campus headend router providing connectivity for the population of teleworkers. The dual hub with single layout topology is fairly to set up. Gre design and configuration part with special focus on gre tunnel key requirements and caveats. Each central site router will be a hub router in its own dmvpn subnet one hub router per. In both topologies, two hub routers are implemented for redundancy purposes. Sec0004 dmvpn redundancy dual hub single cloud lab. On top we have r1 which is located on the main site. Each additional hub runs a topology within the same bgp autonomous system, however hubs route reflectors are unaware of each other. I previously wrote a post on configuring dmvpn phase 2, refer to this post for more detailed information on configuring dmvpn.
Dmvpn is a combination of features that help reduce some of the complexities of communications between a hub location and multiple branch locations. The dmvpn hub does not have to be a ce as it could be deeper in the customer network, but this is less common. Flexvpn topology singlecloud vs dualcloud with dualhub topology its possible to deploy both hubs within a single subnet in what is called a dualhub singlecloud topology. I am currently setting up a dual hub single dmvpn cloud topology. Dmvpn dual cloud, dual noncolocated hub design advice i am working on setting up a dual dmvpn cloud topologyspoketospoke deployment model.
Increasing the eigrp timers also slows down the routing convergence to improve network stability. Pdf study and evaluation of the high availability of a dynamic. Dmvpn a dmvpn is not a protocol so there are no configuration commands that trigger it like ip dmvpn xxxx. Figure 81 single hubsingle dmvpn because the customer configuration must now support voip, a second dmvpn cloud is needed to. A dynamic multipoint vpn is an evolved iteration of hub and spoke tunneling note that dmvpn itself is not a protocol, but merely a design concept. The idea in this case it to have a single dmpvn cloud with all hubs, and all spokes connected to this single subnet cloud. The dmvpn hub connects to the service provider at their provider edge pe router. Thats because many implementations of dmvpn are either with dmvpn as the primary connection with a single hub or dual hub design, or the routing protocol is eigrp, or. The dmvpn hub is therefore a customer edge ce device. The hq router is the hub router and the branchx and branchy are spoke routers. We examine each model and show how ipsec and gremgre tunnels terminate on the hub headend and frontend router. This design guide covers the design topology of dynamic multipoint vpn dmvpn. Oct 12, 2016 this post details the configuration on how to configure a dmvpn phase 3 vpn in a dual hub single cloud. Hub1 will be the primary hub, hub2 is the secondary hub.
The video concludes with failover testing and shows that spoketospoke traffic is not. Dual dmvpn cloud topologyhubandspoke deployment model 14. With the single cloud option we use a single dmvpn network but we add a second hub. One dmvpn cloud is considered primary this is preferred by all branch routers to send traffic. This deployment model is dmvpn in its simplest form. A generic hub and spoke topology implements static tunnels using gre or ipsec, typically between a centrally located hub router and its spokes, which generally attach branch offices. Each additional hub role runs on a distinct vdom or physical device.
Single dmvpn cloud topology 19 best practices and known limitations 110 best. Based on the certain configuration, it is possible to have the virtual tunnels be created between the spoke sites to remove the load from a hub router. Above you can see a dmvpn network with two hubs and two spoke routers. Dmvpn dual cloud, dual noncolocated hub design advice andy, im not sure what you have there for the moment, but we typically recommend bgp for routing, you could do pretty cool stuff with it, the obvious drawback is that bgp is not so plug and play and have a bit longer timers than, say, eigrp. The failover capability is provided by routing protocol. This design, combined with the requirements for multiple more than two hubs and the use of bgp in a single dmvpn cloud, was difficult to find neatly packaged on the internet. Feb 14, 2014 in many companies there is only one router per site, and the hub has 2 isp providers.
The crypto configurations on the branch require manual mapping to both possible. First, consider a single dmvpn hub in a design with no requirement for high availability. A dynamic multipoint virtual private network dmvpn is a secure network that exchanges data between sites without needing to pass traffic through an organizations headquarter. Otherwise, in a dual dmvpn cloud topology, the second hub router serves its own dmvpn subnet. Dmvpn phase 3 single hub ospf hub example grandmetric. For this scenario, we will assume a primarybackup situation where the 192. To demonstrate all of this, well use the following topology.
In this lesson well take a look at the dual hub single cloud option. I am looking to design a dmvpn where multiple spokes are behind a single global nat ip. Jun 07, 2016 routing optimization the eigrp hello interval is increased to 20 seconds and the eigrp hold time is increased to 60 seconds in order to accommodate up to 2000 remote sites on a single dmvpn cloud. I know that the cisco docs say that you can have a spoke behind a nat device, but for multiple natd spokes you have to have unique global ips. The network topology details are as given in the table below. We use a single dmvpn network, each router only has one multipoint gre interface. Dmvpn phase 3 single hub ospf spoke example grandmetric.
The dmvpn deployments provide the ability to configure the dynamic virtual tunnels that can be automatically created depends on the traffic needs and the certain topology. This guide is part of an ongoing series that addresses vpn solutions, using the latest vpn technologies. Single dmvpn network cloud single tier headend architecture. This section describes dmvpn design and configuration principles including. Once your hub router fails, the entire dmvpn network is gone. Hubandspoke phase 1 dmvpn is the easiest dmvpn topology. With dmvpn phase 3 they can be interconnected using a central hub into a single, overall dmvpn. Jan 06, 2017 following up our previous article on dmvpn, we are going to implement another model of dmvpn deployment, dmvpn dual hub single topology. In table 1, the term regional hubs refers to a dm vpn design where hubs are located in different locations, or regions. Scalable dmvpn design and implementation guide cisco. This article explains the difference between dmvpn single tier and dual tier headend setup. Aug 22, 2012 when you starting talking about dmvpn youll typically hear it being described as a phase i, ii, or iii type dmvpn network, so lets quickly discuss the differences between these three dmvpn phases. Cisco flexvpn dmvpn, part 1 overview and design packet. Spoke to spoke tunnel cannot be created in dmvpn phase 1.
The video shows you how to build a redundant dmvpn network with dualhub dual cloud design. Jun 29, 2017 topology base exitaf topology network 10. As per most previous posts gns3 was used to lab the configuration. Sec0004 dmvpn redundancy dual hub single cloud lab minutes. A survey on dynamic multipoint virtual private networks ceur. The design was based on a single dmvpndual hub topology. It consists of the main hub located at the headquarters and remote spokes spread amongst the remote offices. Dmvpn provide faster communication between remote sites, cisco dmvpn allows branch locations to communicate directly with each other over the public wan or internet. Dmvpn multiple spokes behind a single nat global ip solutions. Following up our previous article on dmvpn, we are going to implement another model of dmvpn deployment, dmvpn dual hub single topology. Routing protocol design guidelines for ospf, eigrp and bgp. Cisco dmvpn spoke isakmp sa not deleted after reload of. Pdf establishing secured enterprise network routing. This is commonly referred to as a single dmvpn cloud topology.
Thus, high availability is provided through the use of a second hub router, in a single dmvpn cloud topology, the hub may be on the same dmvpn subnet as the primary router. However the spokes dont recognise this for around an hour and during this time i just get invalid spi errors as the spoke tries to use the old spi. In this article, i show you how to set up a dmvpn with the vyos linux router distribution, which also can be used to improve, secure, or reduce the cost of an existing. Complete document is available as downloadable pdf to subscribers.
A single hub with a single advpn ipsec topology running in a single bgp autonomous system. Dmvpn dual cloud, dual noncolocated hub design advice i am working on setting up a dual dmvpn cloud topology spoketospoke deployment model. Consider this example dmvpn network that connects the company headquarters hq network to its branchx and branchy networks. Designing a private cloud network infrastructure external routing with layer2 data. Migrating from dynamic multipoint vpn phase 2 to phase 3. This design allows remote sitesspokes in a hub and spoke or star vpn router topology to connect to each other directly without sending the trafficdata packets through the hub. Luckily, all dmvpn components have been open sourced. In its simplest form, dmvpn is a pointtomultipoint layer 3 overlay vpn enabling logical hub and spoke topology supporting direct spoketospoke communications depending on dmvpn design phase 1, phase 2 and phase 3 selection.
Pdf security of dynamic and multipoint virtual private network. With eigrp chosen for demonstration in this video, we show how to perform a simple tweak in the routing metric to solve potential asymmetrical routing. The term single dmvpn refers to the fact there is only one dmvpn network in this deployment. Thus, the data plane traffic always passes through spoke 1 hub spoke 2 with this topology in dmvpn phase 1. Detailed diagrams show how protocol packets are encapsulated and decapsulated for each scenario. To add redundancy to our dmvpn network we need to add another hub router. Integrating dmvpnbased internet vpn with mplsvpn wan. Single dmvpn networkcloud single tier headend architecture. Dynamic multipoint virtual private network dmvpn is a vpn technology. A dual dmvpn cloud topology with spoketospoke model consists of two hub routers, each with mgre tunnel interfaces connecting all branch routers. The idea in this case it to have a single dmpvn cloud with. Because we have altered the delay value on the tunnel interfaces of the primary dmvpn cloud, then a router behind the hubs internal should prefer hub1 for access to the spoke. In this phase every hub and spoke is configured with mgre interface so we can create dynamic spoketospoke connectivity, no more static tunnel destinations will be configured. Packet is sent from spokes 1 network to spokes 2 network via hub according to routing table hub routes packet to spoke2 but in parallel sends back the nhrp redirect message to spoke1 containing information about suboptimal path to spoke2 and tunnel ip of spoke2.
Pdf security of dynamic and multipoint virtual private. Dmvpn shares existing zone based firewall policies network logging to existing tools identifies cloud performance problems ios xe supportable by existing it staff existing monitoring tools existing troubleshooting steps. This phase involves configuring a single mgre interface on the hub, and all the spokes are still static tunnels. Dynamic multipoint vpn dmvpn is a wellknown cisco solution that solves the scalability issue when building large vpns. Pdf dynamic multipoint virtual private network, known as dmvpn is a solution that allows the quick. Hub configuration crypto isakmp policy 20 encr 3des hash md5 authentication preshare group 2 crypto keyring keyrisp1 localaddress interface1 presharedkey address 0. A read is counted each time someone views a publication summary such as the title, abstract, and list of authors, clicks on a figure, or views or downloads the fulltext.
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