For this configuration >> 5 0 obj 21 0 obj Spoke1 and Spoke2 can now forward packets directly to each other. Without the direct link between Hub1 and Hub2, Hub2 would not participate in the OSPF routing when Hub1 is also up. GRE tunnels are used in combination with IPsec to solve this problem. Configuration . Configures a multiaccess WAN interface to be in non-broadcast multiaccess An IP subnet can be used for the source in the ACL if the dynamic spoke interface address will be restricted to an address within that subnet. Bgp hub and spoke configuration cisco - aua.hairdance.shop Configuration Examples for Unicast and Multicast over Point-to-Multipoint GRE. 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. To avoid doing asymmetric routing or per-packet load balancing across the links to the two hubs, you need to configure the routing protocol to prefer one spoke-to-hub path in both directions. This makes it easy to design, configure, and modify multilayer hub-and-spoke networks when you are using the DMVPN solution. Again, there are a couple of interesting things to notice about the routing tables on Hub1, Hub2, Spoke1, and Spoke2: If the spoke routers are doing per-packet load-balancing, then you could get out-of-order packets. /Filter /FlateDecode /Dest (G1054138) For more information on document conventions, refer to Cisco Technical Tips Conventions. 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. 7 0 obj The NHRP mappings will expire after five minutes ( the current value of NHRP holdtime = 300 seconds). << These first two new commands are similar to configuring a crypto map and assigning the crypto map to an interface using the crypto map command. Any idea if this is a valid configuration or design? Only the hub router has direct static connections to all spoke routers. This should not be necessary since, when using GRE, the peer source and destination addresses are already known. The spokes still send spoke-to-spoke traffic via the hub since they are using a point-to-point GRE tunnel interface. application/pdf With a few additional configuration lines to the spoke routers you can set up dual (or multiple) hub routers, for redundancy. Also this size configuration may be too large to fit in NVRAM and would need to be stored on Flash memory. A configuration of this size is very hard to manage and even more difficult when troubleshooting the VPN network. 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. endobj The access-list would list the routes from behind all spokes and the access-list would list only the routes from behind spokes where another hub router is to be the primary hub. nhs-address. an NHRP database of public interface addresses of each spoke. This allows the spokes external physical interface IP address to be dynamically assigned. Acrobat Distiller 7.0 (Windows) After a packet destined to 192.168.2.3 has been forwarded to the host, this host will send a return packet to 192.168.1.2. The OSPF areas on the spoke routers have been changed to area 1. concepts of IP multicast routing technology and mGRE tunneling. Introduction to Multipoint GRE and NHRP | Pluralsight << The NHRP registration packet provides the information for the hub router to create an NHRP mapping for this spoke router. /secondaryConcept () You can stop "the migration" at any point if that particular configuration example matches your network design requirements. 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. Find answers to your questions by entering keywords or phrases in the Search bar above. The documentation set for this product strives to use bias-free language. /Rect [162 177.3600006104 430.7399902344 188.6399993896] In other words, it can be used for point-to-multipoint links using which one node can transmit data to many nodes. The NHRP data looks like the following on the hub and spoke. With DMVPN, the spoke-to-spoke establishment would just be established right after spoke-to-hub is up. as required. 16 0 obj DMVPN uses GRE and, therefore, supports IP multicast and dynamic routing traffic across the VPN. Additional information on troubleshooting IPSec can be found at IP Security Troubleshooting - Understanding and Using debug commands. Each of the spoke routers is configured with two p-pGRE tunnel interface, one in each of the two DMVPNs. The Auvergne - Rhne-Alpes being a dynamic, thriving area, modern architects and museums also feature, for example in cities like Chambry, Grenoble and Lyon, the last with its opera house boldly restored by Jean Nouvel. OSPF VRF Configuration . I tried to use BGP and it totally worked fine. /Annots [16 0 R 17 0 R 18 0 R 19 0 R 20 0 R 21 0 R 22 0 R] ip nhrp nhs The hub propagates this new routing information to the other spokes. 15 0 obj Full or partial mesh networks are often desirable because there can be a cost savings if spoke-to-spoke traffic can go directly through rather then via the hub. per tunnel) can quickly get excessive. show crypto engine connections active Displays the total encrypts/decrypts per SA. /Subtype /Link /accessLevel (Guest,Customer,Partner) << service (QoS) are supported on the mGRE tunnel. The Spoke1 router checks the NHRP mapping table for the destination 10.0.0.3 and finds that there is not an entry. /Border [0 0 0] 13 0 obj /First 47 0 R The dynamic routing protocol will not run over the dynamic IPsec+mGRE links between spokes. This allows you some flexibility in deciding when you need to upgrade your spoke routers that are already deployed. The crypto ACL (101) specifies a subnet as the source for the IPsec proxy. This document provides a sample configuration for Hub-and-Spoke Dynamic Multipoint VPN (DMVPN) using generic routing encapsulation (GRE) over IPSec with Enhanced Interior Gateway Routing Protocol (EIGRP), Network Address Translation (NAT), and Context-Based Access Control (CBAC). In that case, multicast packets will be automatically encapsulated through the tunnel to the single possible destination. Bgp hub and spoke configuration cisco - apix.bne-dev.de show ip eigrp neighborDisplays the EIGRP neighbors. GRE + IPsec must know the endpoint peer address. If spoke-to-spoke dynamic tunnels are wanted, then you must use process switching on the tunnel interface on the spoke routers. In contrast, the spoke routers will send packets for the networks behind the hub routers to both Hub1 and Hub2, since there is only a single mGRE tunnel interface on each spoke router and there will be two equal cost routes. multiaccess (NBMA) network instead of manually configuring all the tunnel end points. Multipoint GRE - SNRS - Cisco Certified Expert Notice that there is no set peer or match address commands required because this information is derived directly from the associated GRE tunnel or NHRP mappings. /Nums [0 32 0 R] endobj You can use either p-pGRE or mGRE tunnel interfaces on the spoke routers. We are trying to create a redundant VPN configuration.. - We have one Active/Active VPN Gateway in Azure with two public IPs and BGP enabled - We have two FortiGate Firewalls.. indusind net banking. The configuration on each spoke router would increase by 6 lines. This will only work if the data packets to be encrypted have routable IP addresses. This is advantageous since, if this spoke-to-spoke data traffic was sent via the hub router, then it must be encrypted/decrypted, twice increasing the delay and the load on the hub router. In order to use this feature, the spoke routers need to be switched from point-to-point GRE (p-pGRE) to multipoint GRE (mGRE) tunnel interfaces. When the Spoke2 router receives this packet destined to 192.168.1.2, it will look up this destination in the routing table and find that it needs to forward this packet out the Tunnel0 interface to the IP next-hop, 10.0.0.2. When Hub1 is down, Hub2 will be the OSPF DR for the DMVPN (NBMA network). /Type /Annot Multicast applications are also supported. /Kids [46 0 R] 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. When Hub1 comes back up, it will take over being the OSPF DR for the DMVPN. The only differences are the IP addresses on the local interfaces. Unicast and Multicast over Point-to-Multipoint GRE. Starting in Cisco IOS Software Releases 12.3(5) and 12.3(7)T, an additional parameter was introduced to overcome this limitation: tunnel protection.shared. Point-to-Point Generic Routing Encapsulation (GRE) Tunnels The traditional implementation of a GRE tunnel involved the configuration of a point-to-point tunnel going between two sites. 04-21-2014 /Border [0 0 0] 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. The IP routing table entries for the networks that were learned through the encrypted tunnel will have the other end of the tunnel (GRE tunnel interface IP address) as the IP next hop. /OpenAction [6 0 R /XYZ null null null] endstream This helps when deploying a large number of spoke routers. Displays IPv4 content of the routing table. The only parameter that is required under the profile is the transform set. Configuring Dynamic Multipoint VPN Using GRE Over IPSec With - Cisco Removed the crypto map vpnmap1 command from the Ethernet0 interfaces and put the tunnel protection ipsec profile vpnprof command on the Tunnel0 interface. The shared keyword indicates that mutiple mGRE interfaces will use the IPSec encryption with the same source IP address. << The Spoke1 router creates an NHRP resolution request packet and sends it to its NHS (the Hub router). No feature interactions such as access control list (ACL), Cisco Discovery Protocol, Crypto support, IPSec, or quality of /Type /Pages 17 0 obj Here, we used Interface name. PDF Dynamic Layer 3 VPNs with Multipoint GRE Tunnels - Cisco Note:With this configuration, the spoke routers must initiate the mGRE+IPsec tunnel connection, since the hub router is not configured with any information about the spokes. endobj This dynamic allocation of the "outside address" of the router allows the ISP to oversubscribe the use of their Internet address space, since not all users will be online at the same time. /Count 22 Only IPv4 Next Hop Resolution Protocol (NHRP) is supported, , and as a result, an non-broadcast multiple access network (NBMA) /EmbeddedFiles 10 0 R /MediaBox [0 0 612 792] /Subtype /Link Use these resources to familiarize yourself with the community: There is currently an issue with Webex login, we are working to resolve. The region now has a handful of airports taking international flights. The following is a standard point-to-point IPsec+GRE configuration. stream {ip | ipv6} next-hop-self eigrp Enter a Pre-Shared Key. Perform this task to configure unicast mGRE for a hub: Enables privileged EXEC mode. These parameters are automatically determined from the NHRP mappings for the mGRE tunnel interface. >> When the spoke router starts up, it automatically initiates the IPsec tunnel with the hub router as described above. ipv6 nhrp map address/prefix number. The spoke routers cannot be allowed to become the DR for the mGRE nonbroadcast multiaccess (NBMA) network. Figure 1. Thereafter, packets are able to bypass the hub and use the spoke-to-spoke tunnel. No matter how the networks change at either end, the GRE IP tunnel packets will not change, so this ACL need not change. 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. 1999-06-15T16:00:29Z
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