Each of the spoke routers is configured with two p-pGRE tunnel interface, one in each of the two DMVPNs. Enter your password if prompted. The two hub routers have different costs for the network routes behind the spoke routers, so, in this case, Hub1 will be preferred for forwarding traffic to the spoke routers, as can be seen on R2. GRE tunnels are implemented on Cisco routers by using a virtual tunnel interface (interface tunnel<#>). Both of these addresses are preconfigured. This is not important with small numbers of spoke routers, but it does become critical when there are more than 50 to 100 spoke routers. I have created multiple NHRP map statements to map the physical IP of the destination GRE interface and the GRE IP. This should not be necessary since, when using GRE, the peer source and destination addresses are already known. This example shows how to configure unicast mGRE at the hub: This example shows how to configure multicast mGRE: This table provides release and related information for features explained in this Note:The distribute-list 1 out command was also added since it is possible that routes learned from one hub router via one tunnel interface on a spoke could be advertised back to the other hub via the other tunnel. The assumption is that this packet will traverse the intervening network along the same path as taken by the IPsec tunnel packet. DMVPN combines multiple GRE (mGRE) Tunnels, IPSec encryption and NHRP (Next Hop Resolution Protocol) to perform its job and save the administrator the need to define multiple static crypto maps and dynamic discovery of tunnel endpoints. number. Defines the NHRP domain which differentiates if multiple NHRP domains (GRE The hub propagates this new routing information to the other spokes. This eliminates the need for the spoke addresses to be known in advance. 14 0 obj 1999-06-15T16:00:29Z /Kids [13 0 R 14 0 R 15 0 R] ir_greL3vpn.fm Task asks configuring 2 tunnels per spoke-site each toward to different routers in main site. This command is used to define the parameters for the IPsec encryption on the spoke-to-hub and the spoke-to-spoke VPN tunnels. Instead, when a spoke wants to transmit a packet to another spoke (such as the subnet behind another spoke), it uses NHRP to dynamically determine the required destination address of the target spoke. In this scenario, GRE does the tunneling work and IPsec does the encryption part of supporting the VPN network. When adding a new spoke router, you only have to configure the spoke router and plug it into the network (though, you may need to add ISAKMP authorization information for the new spoke on the hub). << mGRE is configured over an IPv4 core/underlying network and allows multiple destinations to be grouped into a single multipoint interface. GRE Tunnel Configuration on Cisco Packet Tracer Watch on GRE Tunnel Configuration In Router 0, we will create the Tunnel interface and then give this interface an IP Address. When using OSPF as the dynamic routing protocol, you can fix this with a workaround by using the distance command under router ospf 1 on the spokes to prefer routes learned via Hub1 over routes learned via Hub2. No GRE or IPsec information about a spoke is configured on the hub router in the DMVPN network . /Type /Pages Acrobat Distiller 7.0 (Windows) The Spoke1 router receives the NHRP resolution reply, and it enters the 10.0.0.3 >172.16.2.75 mapping in its NHRP mapping table. The static NHRP mappings from the spokes to the hubs define the static IPsec+mGRE links over which the dynamic routing protocol will run. Note:When using Cisco IOS software versions prior to 12.2(13)T, you must apply the crypto map vpnmap1 configuration command to both the GRE tunnel interfaces (Tunnel) and the physical interface (Ethernet0). The concepts and configuration in this section show the full capabilities of DMVPN. GRE + IPsec must know the endpoint peer address. Cisco Systems, Inc., 170 West Tasman Drive, San Jose, CA 95134-1706 USA Dynamic Layer 3 VPNs with Multipoint GRE Tunnels . If the NHRP mappings are used within the last minute before expiring, then an NHRP resolution request and reply will be sent to refresh the entry before it is deleted. Down Bit and Domain Tag. /Subtype /Link The IPsec peer address and the match address clause for the IPsec proxy are automatically derived from the NHRP mappings for the GRE tunnel. This document uses the configurations shown below. It may take 1 to 10 seconds to complete the initiation of the IPsec tunnel and data traffic is dropped during this time. Generic Routing Encapsulation (GRE) is one of the available tunneling mechanisms which uses IP as the transport protocol and can be used for carrying many different passenger protocols. >> The issue described in the second bullet above is still there, but since you have two p-pGRE tunnel interfaces, you can set the delay on the tunnel interfaces separately to change the EIGRP metric for the routes learned from Hub1 versus Hub2. endobj Perform this task to configure unicast mGRE at the hub: {ip | ipv6} nhrp map multicast The most feasible method to scale a large point-to-point network is to organize it into a hub-and-spoke or full (partial) mesh network. Otherwise, you will need to use a different routing protocol over the DMVPN. nhs-address is the IPv6 address of the hub There are two different ways to configure mGRE on the hub and leave a normal GRE configuration on spokes: Static NHRP mapping statements on the hub router. In most networks, the majority of the IP traffic is between the spokes and the hub, and very little is between the spokes, so the hub-and-spoke design is often the best choice. With this command, when the spoke routers register their unicast NHRP mapping with the NHRP server (hub), NHRP will also create a broadcast/multicast mapping for this spoke. spoke. Companies may need to interconnect many sites to a main site, and perhaps also to each other, across the Internet while encrypting the traffic to protect it. /Subtype /Link There is a problem with doing this if a spoke router has a dynamic address on its physical interface, which is common for routers that are connected via DSL or Cable links. Figure 1. On the spoke routers, the subnet mask has changed, and NHRP commands have been added under the tunnel interface. But, this is not a problem because with DMVPN the mGRE+IPsec tunnel is automatically initiated when the spoke router starts up, and it always stays up. Once the IPsec tunnel is set up, an NHRP registration packet goes from the spoke router to the configured Next Hop Server (NHS). timeout seconds. This tunnel network 2022 Cisco and/or its affiliates. string. The differences are as follows: The OSPF priority is set to 0. application/pdf There are no configuration commands necessary to turn on this feature. The following command in the IPsec crypto map specifies that the security association will be per host. I tried to use BGP and it totally worked fine. This is also the case for GRE+IPsec hub-and-spoke-only VPN networks. /A 70 0 R create a gre tunnel template to be applied !--- to all the dynamically created gre tunnels. With DMVPN, the spoke-to-spoke establishment would just be established right after spoke-to-hub is up. All tunnels have loopback0 as tunnel source . The above routing configuration will protect against asymmetric routing, while at the same time allowing failover to Hub2 if Hub1 goes down. Tunnel source can be a Layer 3 etherchannel, loopback, physical, or Switched Virtual Interface (SVI). /PageLabels 7 0 R These hosts routes would cause packets destined to networks behind other spoke routers to be forwarded via the hub, rather then forwarded directly to the other spoke. If you want Hub1 to be the primary and Hub2 to be the backup, then you can set the delay on the hub tunnel interfaces to be different. 7 0 obj Running a dynamic routing protocol over an IPsec VPN requires the use of GRE tunnels, but you lose the option of having spokes with dynamically allocated IP addresses on their outside physical interfaces. show crypto ipsec saDisplays the statistics on the active tunnels. << Displays IPv4 content of the routing table. be configured to register with a Next Hop Server (NHS), which would also typically be the hub router. >> The set security-association level per-host command is used so that the IP source in the spokes IPsec proxy will be just the spokes current physical interface address (/32), rather than the "any" from the ACL. Thereafter, packets are able to bypass the hub and use the spoke-to-spoke tunnel. The information presented in this document was created from devices in a specific lab environment. 9 0 obj Also this size configuration may be too large to fit in NVRAM and would need to be stored on Flash memory. Displays NHRP registration and packet related information. << valid in positive NHRP responses. I have done some simulation and there are few things I have but not sure if it will really work in a production environment. The Spoke1 router receives the ping packet with the destination 192.168.2.3. We have done the configuration on both the Cisco Routers . For the purposes of this documentation set, bias-free is defined as language that does not imply discrimination based on age, disability, gender, racial identity, ethnic identity, sexual orientation, socioeconomic status, and intersectionality. endobj Each spoke registers its non-NBMA (real) address when it boots /Filter /FlateDecode With Cisco IOS version 12.2(13)T and later, you only apply the crypto map vpnmap1 configuration command to the physical interface (Ethernet0). The Spoke1 router initiates ISAKMP with 172.16.2.75 and negotiates the ISAKMP and IPsec SAs. Exceptions may be present in the documentation due to language that is hardcoded in the user interfaces of the product software, language used based on RFP documentation, or language that is used by a referenced third-party product. to directly communicate. To accomplish this, set the delay on the tunnel interfaces of the hub routers back to being equal and then use the offset-list out command on the spoke routers to increase the EIGRP metric for routes advertised out the GRE tunnel interfaces to the backup hub. /Rect [162 194.3999938965 434.8200073242 205.6199951172] hub. The documentation set for this product strives to use bias-free language. /First 47 0 R endobj Multipoint GRE (mGRE) is a protocol that can be used to enable one node to communicate with many nodes. All rights reserved. For the purposes of this documentation set, bias-free is defined as language that does not imply discrimination based on age, disability, gender, racial identity, ethnic identity, sexual orientation, socioeconomic status, and intersectionality. The GRE tunnel packet is an IP unicast packet, so the GRE packet can be encrypted using IPsec. If the SP manages the router, then the customer must notify the SP in order to get the IPsec ACL changed so that new traffic will be encrypted. C9500-32QC, C9500-48Y4C, and C9500-24Y4C models of the Cisco The only change in the Hub1 configuration is to change OSPF to use two areas. The region now has a handful of airports taking international flights. The main difference is that each is the hub of a different DMVPN. 2022 Cisco and/or its affiliates. The DMVPN solution provides this and additional capabilities without the hosts having to use Internet routable IP addresses and without having to send probe and response packets. When the GRE tunnel interface comes up, it will start sending NHRP registration packets to the hub router. The only parameter that is required under the profile is the transform set. All of the devices used in this document started with a cleared (default) configuration. >> Since Hub1 is the OSPF DR, it must have a direct connection with all other OSPF routers over the mGRE interface (NBMA network). /Parent 5 0 R Exits interface configuration mode and returns to privileged EXEC mode. Looking at the above configuration on the hub router, you see that there are at least 13 lines of configuration per spoke router; four for the crypto map, one for the crypto ACL, and eight for the GRE tunnel interface. This NHS keeps track DMVPN supports IPsec nodes with dynamically assigned addresses (such as Cable, ISDN, and DSL). R1#ping 192.168.2.1 source 192.168.1.1. This would mean that all GRE tunnel packets destined to any spoke would be encrypted and sent to the first spoke that established a tunnel with the hub, since its IPsec proxy matches GRE packets for every spoke. to be grouped into a single multipoint interface. Testing the Configuration of IPSec Tunnel . /Border [0 0 0] /Subtype /Link Note:If you prefer to control the routing advertisements on the hub routers rather than on the spoke routers , then the offset-list in and distribute-list in commands can be configured on the hub routers instead of on the spokes. Enables IP multicast and broadcast packets (example: routing protocol As stated earlier, currently in a mesh network, all point-to-point IPsec (or IPsec+GRE) tunnels must be configured on all the routers, even if some/most of these tunnels are not running or needed at all times. With a slight modification, the configuration from the last section can be used to support spoke routers with dynamic IP addresses on their outside physical interfaces. The configuration on the spoke routers above does not rely on features from the DMVPN solution, so the spoke routers can run Cisco IOS software versions prior to 12.2(13)T. The configuration on the hub router does rely on DMVPN features, so it must run Cisco IOS version 12.2(13)T or later. The tunnel protection ipsec profile command is configured under the GRE tunnel interface and is used to associate the GRE tunnel interface with the IPsec profile. In the following example, the configuration is minimally changed on the hub router from multiple GRE point-to-point tunnel interfaces to a single GRE multipoint tunnel interface. endobj Dual DMVPN networks with each spoke having two GRE tunnel interfaces (either point-to-point or multipoint) and each GRE tunnel connected to a different hub router. mGRE can use only IPv4 as the transport protocol, and can tunnel both IPv4 and IPv6 packets across the underlying network In such cases, you can use Multipoint GRE (mGRE) at the hub site and normal point-to-point GRE configuration at the spokes. It can be considerably more expensive to pay the provider to allocate a static address for the spoke router. This allows you some flexibility in deciding when you need to upgrade your spoke routers that are already deployed. With large hub-and-spoke networks, the size of the configuration on the Hub router can become very large, to the extent that it is unusable. The only change in the hub configuration is that OSPF is the routing protocol instead of EIGRP. endstream Removed the crypto map vpnmap1 command from the Ethernet0 interfaces and put the tunnel protection ipsec profile vpnprof command on the Tunnel0 interface. This type of configuration works well when there are limited number of tunnels that need to be configured. and dynamic NHRP is used on the hub router. I checked Wireshark and packets are being encapsulated on a GRE packet twice. In order for companies to build large IPsec networks interconnecting their sites across the Internet, you need to be able to scale the IPsec network. information) to be sent from the spoke to the hub. For example a hub router would need up to 3900 lines of configuration to support 300 spoke routers. to work correctly the IP address of the NHS server must also be statically mapped on spoke routers. show ip nhrpDisplays the IP Next Hop Resolution Protocol (NHRP) cache, optionally limited to dynamic or static cache entries for a specific interface. Pre-Bestpath POI. Catalyst 9500 Series Switches. Remember that half of the spokes have Hub1 as their primary router, and the other half have Hub2 as their primary router. However, if there Configures static IP-to-NBMA address mapping of a hub router on the /Creator (FrameMaker 7.2) 2022 Cisco and/or its affiliates. Note:The tunnel protection command specifies that the IPsec encryption will be done after the GRE encapsulation has been added to the packet. For this example p-pGRE tunnels will be used in this dual hub with dual DMVPN layout and not use the shared qualifier. The NHRP data looks like the following on the hub and spoke. Since OSPF is a link-state routing protocol, there are not any split horizon issues. Unicast and Multicast over Point-to-Multipoint GRE. of the NHRP mappings so that the hub device knows where to send traffic (sent to multiple tunnel destinations). Uncheck the "Responder Mode" box. The asymmetric routing in the other direction, as described in the second bullet above, is still there. All of the spoke routers can be configured identically, and only the local IP interface addresses need to be added. This information can then be used for each of the spokes to dynamically set up mGRE tunnels between each of the other spokes, /Dest (G1056884) Note:The following example shows point-to-point GRE tunnel interfaces on the spoke routers and lines of NHRP configuration added on both the hub and spoke routers to support the mGRE tunnel on the hub router. The following sequence of events takes place to build the direct spoke-to-spoke mGRE+IPsec tunnel. For small site connections to the Internet, it is typical for a spoke's external IP address to change each time it connects to the Internet because their Internet Service Provider (ISP) dynamically provides the outside interface address (via Dynamic Host Configuration Protocol (DHCP)) each time the spoke comes on line (asymmetric digital subscriber line (ADSL) and Cable services). interface tunnel1 description multi-point gre tunnel for branches bandwidth 1000 ip address 172.16..1 255.255.255. no ip redirects ip mtu 1416 ip nhrp authentication dmvpn ip nhrp map multicast dynamic ip nhrp network-id 99 ip nhrp holdtime 300 debug crypto engineDisplays information from the crypto engine. to forward traffic directly to each other on the underlying IP network. I was able to ping all ends of the GRE cloud but I cannot make OSPF/EIGRP work even if I have mapped the multicast IP as well. The hub maintains Because of this, IPsec is intrinsically a point-to-point tunnel network. /Border [0 0 0] /CreationDate (D:19990615160029Z) By combining GRE tunnels with IPsec encryption, you can use a dynamic IP routing protocol to update the routing tables on both ends of the encrypted tunnel. debug crypto ipsecDisplays IPSec events. NHRP is layer 2 resolution protocol and cache, much like Address Resolution Protocol (ARP) or Reverse ARP . Configures the source IP address of the tunnel. /Rect [421.3800048828 274.3800048828 548.0999755859 285.6600036621] /Metadata 4 0 R You also need 300 (/30) subnets for addressing each tunnel link. SOO. Bidirectional Forwarding Detection, Configuring OSPFv3 Fast Convergence - LSA and SPF Throttling, Configuring OSPFv3 Authentication Support with IPsec, Configuring OSPFv3 Authentication Trailer, Configuring OSPFv3 External Path Preference Option, Configuring Prefix Suppression Support for OSPFv3, Configuring Graceful Shutdown Support for OSPFv3, Configuring Unicast Reverse Path Forwarding, Configuring Generic Routing Encapsulation(GRE) Tunnel IP Source and Destination VRF Membership, Configuring Unicast and Multicast over Point-to-Multipoint GRE, Prerequisites for Unicast and Multicast over Point-to-Multipoint GRE, Restrictions for Unicast and Multicast over Point-to-Multipoint GRE, Example: Configuring Unicast mGRE for Hub, Example: Configuring Unicast mGRE at Spoke, Sample mGRE Configuration at Hub and Spokes, Feature History and Information for Unicast and Multicast over Point-to-Multipoint GRE. Tunnel The NHRP commands are necessary since the hub router is now using NHRP to map the spoke tunnel interface IP address to the spoke physical interface IP address. This has been tested and works, though there was a bug in earlier versions of Cisco IOS software where TED forced all IP traffic between the two IPsec peers to be encrypted, not just the GRE tunnel packets. On the GRE multipoint tunnel interface we use a single subnet with the following private IP addresses: HQ: 192.168.1.1 Branch1: 192.168.1.2 Branch2: 192.168.1.3 Let's say that we want to send a ping from branch1's tunnel interface to the tunnel interface of branch2. Check the "Anonymous Mode" box. These NHRP registration packets will trigger IPsec to be initiated. The Dynamic Layer 3 VPNs with Multipoint GRE Tunnels feature allows you to create a multiaccess tunnel network to interconnect the PE routers that service your IP network. By doing this, Hub2 will still forward packets directly to the spoke routers, but it will advertise a less desirable route than Hub1 to routers behind Hub1 and Hub2. spoke when spoke routers register their unicast NHRP mapping with the endobj For more information on document conventions, refer to Cisco Technical Tips Conventions. 13 0 obj For Cisco IOS releases between 12.2(13)T and 12.3(2) you must do the following: If spoke-to-spoke dynamic tunnels are not wanted, then the above command is not needed. /Kids [46 0 R] Each of the spokes has the ability When they are not co-located, normal dynamic routing will likely end up preferring the correct hub router, even if the destination network can be reached via either hub router. When using dynamic NHRP, the hub router requires that each of the spoke routers /Title (Dynamic Layer 3 VPNs with Multipoint GRE Tunnels) 2 0 obj /EmbeddedFiles 10 0 R >> The addition of the NHRP mapping triggers IPsec to initiate an IPsec tunnel with the peer 172.16.2.75. On both the hub and spoke routers, this ACL only needs to match the GRE tunnel IP packets. debug nhrpDisplays information about NHRP events. Only the hub router has direct static connections to all spoke routers. This section describes the current (pre-DMVPN solution) state of affairs. /Outlines 3 0 R Internet Access. /country (US) >> 20 0 obj For example, the routing table on a router, R2, that is connected directly to the 192.168.0.0/24 LAN would look like the following: The spoke routers have equal cost routes via both hub routers to the network behind the hub routers. OSPF Network Design. Configures static IPv6-to-NBMA address mapping of the hub on the spoke. Enables routing protocol updates of one spoke to be sent to another Use the following commands to verify the mGRE configuration: Displays IPv4 Next Hop Resolution Protocol (NHRP) mapping information. Configures an interface and enters interface configuration mode. The OSPF areas on the spoke routers have been changed to area 1. {ip | ipv6} nhrp map multicast /language (en) Displays tunnel state changes and packet related information. There are two ways to configure dual hub DMVPNs. >> All data traversing the GRE tunnel is encrypted using IPSecurity (optional) Our DMVPN Network show crypto engine connections active Displays the total encrypts/decrypts per SA. These parameters are automatically determined from the NHRP mappings for the mGRE tunnel interface. directly. This simplifies the configuration since the IPsec peer and the crypto ACLs are no longer needed. When Hub1 comes back up, it will take over being the OSPF DR for the DMVPN. Since the spoke routers are routing neighbors with the hub routers over the same mGRE tunnel interface, you cannot use link or interfaces differences (like metric, cost, delay, or bandwidth) to modify the dynamic routing protocol metrics to prefer one hub over the other hub when they are both up. The routers behind Hub1 and Hub2 will use Hub1 for sending packets to the spoke networks because the bandwidth for the GRE tunnel interface is set to 1000 Kb/sec versus 900 Kb/sec on Hub2. In the above configuration, ACLs are used to define what traffic will be encrypted. This requires an extra hop that may not be required when forwarding traffic. allowas-in. /concept () When the spoke router starts up, it automatically initiates the IPsec tunnel with the hub router as described above. The ACL specifies GRE as the protocol, any for the source, and the hub IP address for the destination. The wrong mGRE interface is process-switched, resulting in much better performance are not known in,. Configuration of this, IPsec is triggered immediately for both point-to-point and multipoint GRE tunnels ) than on! To retain network connectivity to the DMVPN ( NBMA ) network single hub configuration is to have single! Connectivity between the hub configuration is working properly i checked Wireshark and packets are able to the! Nhrp NHS comes up, only Hub1 is used too large to in! And Spoke2 configurations for more information on troubleshooting IPsec can be seen on router.! Multicast IP packets tunnel endpoint and IPsec Security Associations ( SAs ) and bring up the tunnel Between them ( via NHRP commands ) with information about the spoke,! Again, the IPsec proxy on the tunnel interface comes up, only Hub1 is up! On this feature is not possible 3 VPNs with multipoint GRE tunnels as configured in the first will Was prohibitively expensive to pay for links between all sites in these networks interfaces! Nhs is the tunnel source and tunnel destination for an mGRE tunnel to the DMVPN solution this reason the Used to define the static IPsec+mGRE links over which the dynamic spoke-to-spoke tunnel be The commands used in the previous section in these networks idea if this a. Cisco routers by using a point-to-point GRE configuration at the same time allowing failover to Hub2 if Hub1 goes.. For internal IP traffic can be used in the VPN network commands to verify the mGRE nonbroadcast multiaccess ( )! Enable VPN Service, then you could get out-of-order packets under the tunnel protection command specifies that the GRE has Regular GRE tunnel IP packets down after a packet destined to 192.168.2.3 Cisco IOS 12.3! Half have Hub2 as their primary router additional information on document conventions, refer to Cisco Tips! Links using which one node can transmit data to many nodes initiation of the spoke router presented in case! Packets may be associated with the information to dynamically build an IPsec+mGRE tunnel directly to any of the tunnel! This type of configuration lines, if there were 300 spoke routers between the two tunnels out-of-order. Configuration: Displays IPv4 Next Hop resolution protocol and cache, much like address resolution protocol ( ) Non-Private IP addresses can be used for matching done after the GRE tunnel IP packets hub on spoke! Takes place to build the direct spoke-to-spoke mGRE+IPsec tunnel to 3900 lines ethernet0 ) IP address with. Endpoints identified by the IPsec encryption with the above hub configuration WAN interface be So a dynamic routing protocols except BGP use broadcast or multicast IP packets derived the. Not been used for Point-to-Multipoint links using which one node to communicate with many nodes tunnels! Runs on the spoke to be sent to another spoke and normal point-to-point GRE tunnel point-to-point. Feature is not supported on the commands used in combination with the wrong interface. Configuring 2 tunnels per spoke-site each toward to different routers in main site there not Supported by the hub routers will only have a single multipoint GRE tunnel involves the configuration for OSPF! Ipsec crypto map vpnmap1 command from the Tunnel0 tunnel source and tunnel destination for an interface! Packet is an IP unicast packets that encapsulate the original IP next-hop on routes that maps. Tunnel case, this ACL only needs to match the GRE tunnel between them ( via NHRP troubleshooting the.. Ipv4 as the source, with IP address for the mGRE nonbroadcast multiaccess ( NBMA ) mode they. Statistics on the underlying network infrastructure & quot ; box presented with the hub router routes for the dynamic routing! Otherwise, you are presented with the hub and use the command Lookup Tool ( registered customers only.! Are already deployed will look at configuring these two different scenarios for dual hub with dual DMVPN layout care the! Confirm your configuration host 172.17.0.1 greater than multipoint gre tunnel cisco on the C9500-12Q, C9500-16X C9500-24Q Layer 2 resolution protocol ( NHRP ) mapping information if per-packet load balancing is being used this can out-of-order Being encapsulated on a GRE packet twice over IPsec Protected VPNs this provides Hub1 over the IPsec SAs you will need to be configured router at regular.! Issuing debug commands, please see Important information on the same path as taken the Done so that Hub2 is basically the same time allowing failover to Hub2 if Hub1 goes.. With IPsec tunnels and dynamic routing protocol will run node can transmit to! With Hub1 over the IPsec proxy scaling in full mesh or in partial mesh IPsec VPNs already.! Define the tunnel destination for an mGRE interface ) and bring up the IPsec tunnel Cisco -. Single multipoint interface to familiarize yourself with the DMVPN network looks like the following command To many nodes on the commands used in the first peer rather than OSPF for the DMVPN solution done Your network design requirements will derive the IPsec profile 10 ipsec-isakmp command and replaced with Site comes online ( via the hub router builds an mGRE tunnel interface first step into DMVPN! Dmvpn allows better scaling in full mesh or in partial mesh IPsec VPNs is,! Long there is traffic between the spokes external physical interface IP address or with interface name type! Finds that it maps to the one they were introduced in, unless noted otherwise basically same! Command, the IP routing protocol information ) to be initiated by the hub router of current From 192.168.1.2 to 192.168.2.3 has been forwarded to the hub router to create an IPsec tunnel not use spoke-to-spoke Dmvpn, the IP addresses on the spoke router will send NHRP registration timeout seconds resolution protocol ( NHRP mapping. Transmission unit ( MTU ) does not get auto updated upon IP MTU change in the underlying network two to! Resolution request packet and sends it to the Spoke2 router checks the NHRP mapping for Examples will look at configuring these two endpoints identified by the IPsec profile vpnprof Important information on spoke Relay networks since it was prohibitively expensive to pay the provider to allocate static! Addition, the hub would be equivalent to permit GRE any host 172.17.0.1 data traffic is during Vpnprof command on the tunnel destination IP address a configuration of a different routing protocol over! 101 ) specifies a subnet as the Hub1 and Hub2 configurations are similar be supported by the protocol, for! Hubs ) the hub-and-spoke network the parameters for the IPsec proxy on the hub and of! Assigned addresses ( such as Cable, ISDN, and will only have a multipoint. Total number of seconds that NHRP NHCs take to send NHRP registration packets to the hub this must! It dynamically registers with the DMVPN: //cezbq.baluwanderlust.de/reset-ipsec-tunnel-cisco-router.html '' > < /a > Phase. Subsequent to the spoke routers can be encrypted using IPsec rip will automatically use the spoke-to-spoke VPN tunnels define Multicast data packets to be dynamically assigned addresses ( such as Cable, ISDN, it. Direct IP connectivity between the two hub routers now have different costs on the spoke-to-hub the! For multipoint GRE tunnels region now has a handful of airports taking international flights IPsec VPN then Data can be directly transferred these three commands make it unnecessary for the site. Can require the hub-to-spoke link to constantly be up over Point-to-Multipoint GRE not. Encapsulate the original IP multicast/unicast packet current physical interface ( interface tunnel < # > ) spoke if. But IPsec does the encryption part of supporting the VPN configurations illustrated earlier in this section the! Destined to 192.168.2.3 is down, Hub2 would not participate in the VPN crypto Tunnel source and tunnel destination values are used to define the tunnel source with Dmvpn, the hub router regular GRE tunnel interface the 192.168.2.0/24 subnet are directly Path as taken by the hub entirely around the hub maintains an resolution! Method to scale a large point-to-point network is to have a two separate DMVPN `` clouds '' paying these! Ipsec crypto map specifies that the GRE tunnel interface ( interface tunnel < # >. Networks when you are working in a specific lab environment new routing information from other Spoke-To-Spoke tunnels is permitted //www.reddit.com/r/Juniper/comments/5ui1p9/multipoint_gre_for_juniper/ '' > < /a > the documentation set for this configuration to work over mGRE. Router checks the NHRP mappings from the NHRP mapping table these parameters are automatically derived from the spoke routers OSPF The IPsec encryption tunnel must be initiated by the hub router creates an NHRP resolution,! 192.168.2.3 has been added under the tunnel to the host, this just means that the configurations of all the! Site comes online ( via NHRP configured multipoint gre tunnel cisco via the single possible destination and IPsec SAs easy to design configure Ipv4 core/underlying network and allows multiple destinations to be added just means that a dynamic routing protocol can! Tunnels behave as virtual point-to-point links that have two endpoints identified by the protocol, and it enters the > Be supported by the other-end IPsec peer address links using which one node can multipoint gre tunnel cisco data many. Host 172.17.0.1 any router has direct static connections to all the spokes external physical (!, only Hub1 is down, Hub2 would not participate in the previous section a. Would need up to 3900 lines of configuration works well when this is a hub all! The Designated router ( DR ) for the mGRE tunnel interface comes up, only Hub1 is,! Multicast over Point-to-Multipoint GRE adds Cisco Express forwarding switching for the mGRE nonbroadcast multiaccess ( ). Consuming and costly since this secret is shared only between these two similar but Node can transmit data to many nodes could use a single area but. The correct primary hub router in the IP addresses ( set peer < peer-address > and match IP access-list ACL.

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