tunnel mode gre multipoint . /docType () << The following examples will look at configuring these two different scenarios for dual hub DMVPNs. /Dest (G1054296) R1#ping 192.168.2.1 source 192.168.1.1. When the NHRP mapping has not been used for forwarding packets for the holdtime, the NHRP mapping will be deleted. 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. The only change in the Hub1 configuration is to change OSPF to use two areas. The functionality that is used in the new spoke configuration is as follows. In most cases, all the spokes simply need unique IP addresses on their interfaces, and the rest of the their configurations will be the same. It may take 1 to 10 seconds to complete the initiation of the IPsec tunnel and data traffic is dropped during this time. The differences in the configuration on the spoke routers are as follows: In the new configuration, the spoke is configured with static NHRP mappings for Hub2 and Hub2 is added as a next hop server. /Subtype /Link At this point, you can take a look at the routing tables, the NHRP mapping tables, and the IPsec connections on the Hub1, Hub2, Spoke1, and Spoke2 routers to see the initial conditions (just after the Spoke1 and Spoke2 routers come up). Since Hub1 is the OSPF DR, it must have a direct connection with all other OSPF routers over the mGRE interface (NBMA network). The primary things to notice about the spoke configurations are: The external physical interface (ethernet0) IP address is dynamic via DHCP. /iaPath () /Annots [16 0 R 17 0 R 18 0 R 19 0 R 20 0 R 21 0 R 22 0 R] The IPsec proxy is derived from the Tunnel0 tunnel source

command and the NHRP mapping. No other changes are necessary. For Cisco, you can configure a mulipoint GRE interface like so . (NBMA) mode. BGP Extended Communities for OSPF. Select Transport in the Mode drop-down. The configuration on each spoke router would increase by 6 lines. This section provides information you can use to troubleshoot your configuration. There is a fundamental problem with IPsec tunnels and dynamic routing protocols. 21 0 obj 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. 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. << GRE tunnels do support transporting IP multicast and broadcast packets to the other end of the GRE tunnel. The spoke routers are also configured with the hub as their NHRP NHS. /Type /Pages Each of the spoke routers is configured with two p-pGRE tunnel interface, one in each of the two DMVPNs. interface. The following highlighted changes are relative to the dynamic multipoint hub and spoke configurations illustrated earlier in this document. This means Hub1 will be preferred for forwarding traffic to the spoke routers, as can be seen on router R2. Each DMVPN uses a different: The dynamic routing protocol has been switched from OSPF to EIGRP, since it is easier to set up and manage a NBMA network using EIGRP, as described later in this document. >> 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. The spoke routers learn these (sub)networks via the dynamic IP routing protocol running over the IPsec+mGRE tunnel with the hub. The addition of the NHRP mapping triggers IPsec to initiate an IPsec tunnel with the peer 172.16.1.24, but there already is an IPsec tunnel with peer 172.16.1.24, so nothing further needs to be done. 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. service (QoS) are supported on the mGRE tunnel. In the past, the only way to make the connection was to use a Layer-2 network such as ISDN or Frame Relay to interconnect everything. Autonomous System Override. The DR must have access to all members of the NBMA network. Learn more about how Cisco is using Inclusive Language. /Type /Pages On both the hub and spoke routers, this ACL only needs to match the GRE tunnel IP packets. /Border [0 0 0] The IP addresses can change each time the site comes online (via DHCP). The spoke-to-spoke links are established on demand whenever there is traffic between the spokes. << So in this case, you need the following configuration command to instruct EIGRP to use the original IP next-hop when advertising these routes. nbma address. /Author (ctsadmin-p.gen) endobj /Subtype /XML >> 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. In the p-pGRE tunnel case, both the tunnel source and the tunnel destination IP addresses can be used for matching. In the previous configuration, the ip nhrp map multicast command was not needed since the GRE tunnel was point-to-point. to directly communicate. /MediaBox [0 0 612 792] Removed the crypto map vpnmap1 10 ipsec-isakmp command and replaced it with crypto ipsec profile vpnprof. 2022 Cisco and/or its affiliates. 15 0 obj to configured NHRP NHSs. This document discusses Dynamic Multipoint IPsec VPNs (DMVPN) and why a company might want to design or migrate their network to make use of this new IPsec VPN solution in Cisco IOS Software. Displays IPv6 content of the routing table. /CreationDate (D:19990615160029Z) >> This is done so that Hub2 is an OSPF neighbor with Hub1 over the mGRE tunnel. network can dynamically learn the NBMA physical address of other systems that are part of that network, allowing these systems Any idea if this is a valid configuration or design? EIGRP. Configures the IPv6 address of the tunnel. This requires an extra hop that may not be required when forwarding traffic. When using GRE with IPsec, the GRE tunnel configuration already includes the GRE tunnel peer (tunnel destination ) address, which also is the IPsec peer address. /Dest (G1071956) /Nums [0 32 0 R] /Kids [58 0 R 59 0 R 60 0 R 61 0 R 62 0 R 63 0 R 64 0 R 65 0 R 66 0 R 67 0 R] and server protocol, where the hub is the Next Hop Server (NHS) and the spokes are the Next Hop Clients (NHCs). If you have an earlier release you can use p-pGRE tunnels in this dual hub with dual DMVPN layout. With the above command, the spoke router will send NHRP Registration packets through the mGRE+IPsec tunnel to the hub router at regular intervals. This NHS keeps track The spokes still send spoke-to-spoke traffic via the hub since they are using a point-to-point GRE tunnel interface. All of the devices used in this document started with a cleared (default) configuration. Customers Also Viewed These Support Documents. Click Next. On a Cisco router, each IPsec peer needs to be configured with the IP address of the other IPsec peer before the IPsec tunnel can be brought up. Enables routing protocol updates of one spoke to be sent to another In main site there are 2 routers (these are DMVPN hubs). The asymmetric routing in the other direction, as described in the second bullet above, is still there. /Kids [6 0 R 49 0 R 50 0 R 51 0 R 52 0 R 53 0 R 54 0 R 55 0 R 56 0 R 57 0 R] The last new command, ip nhrp map multicast dynamic, allows NHRP to automatically add spoke routers to the multicast NHRP mappings when these spoke routers initiate the mGRE+IPsec tunnel and register their unicast NHRP mappings. 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. The tunnels behave as virtual point-to-point links that have two endpoints identified by the tunnel source and tunnel destination addresses at each endpoint. This piece of the configuration defines the crypto ACL and the GRE tunnel interface for that spoke router. 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 The information presented in this document was created from devices in a specific lab environment. The Spoke1 router checks the NHRP mapping table for the destination 10.0.0.3 and finds that there is not an entry. The current method for solving this problem is to use generic routing encapsulation (GRE) tunnels in combination with IPsec encryption. This example shows how to configure unicast mGRE for the hub: This example shows how to configure unicast mGRE at a spoke. seconds. I have created multiple NHRP map statements to map the physical IP of the destination GRE interface and the GRE IP. With the DMVPN solution, IPsec is triggered immediately for both point-to-point and multipoint GRE tunnels. access-list 101 permit gre 172.16.2.0 0.0.0.255 host 172.17.0.1. With Cisco IOS version 12.2(13)T and later, you only apply the crypto map vpnmap1 configuration command to the physical interface (Ethernet0). Notice that the configurations of all of the spoke routers are very similar. In that case, multicast packets will be automatically encapsulated through the tunnel to the single possible destination. /title (Dynamic Layer-3 VPNs with Multipoint GRE Tunnels) /Type /Annot /Creator (FrameMaker 7.2) Here, we used Interface name. RIP will automatically use the original IP next-hop on routes that it advertises back out the same interface where it learned these routes. /Resources 31 0 R 07:39 AM This document uses the configurations shown below. >> /secondaryConcept () The dual hub with a single DMVPN layout is fairly easy to set up, but it does not give you as much control over the routing across the DMVPN as the dual hub with dual DMVPNs layout does. The DMVPN solution introduces the following new commands: The crypto ipsec profile command is used like a dynamic crypto map, and it is designed specifically for tunnel interfaces. Sample mGRE Configuration at Hub and Spokes nhs-address. Once the IPsec tunnel is set up, an NHRP registration packet goes from the spoke router to the configured Next Hop Server (NHS). show crypto engine connections active Displays the total encrypts/decrypts per SA. There are a couple of interesting issues to notice about the routing tables on Hub1, Hub2, Spoke1, and Spoke2: Both hub routers have equal cost routes to the networks behind the spoke routers. This will take care of the asymmetric routing problem described in the first bullet above. as required. 20 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. TED can be used in combination with the GRE tunnels as configured in the previous section. In this case, the Hub1 and Hub2 configurations are similar. as point-to-point GRE tunnels. The documentation set for this product strives to use bias-free language. Enter a Pre-Shared Key. /country (US) Also, the hub adds the spoke router to its NHRP multicast mapping list. The dynamic routing protocols (RIP, OSPF and EIGRP) need to be configured on the hub router to advertise the routes back out the mGRE tunnel interface and to set the IP next-hop to the originating spoke router for routes learned from one spoke when the route is advertised back out to the other spokes. In such cases, you can use Multipoint GRE (mGRE) at the hub site and normal point-to-point The spokes external physical interface and the mapping to the spokes tunnel interface IP addresses are learned dynamically by the hub via NHRP. /A 70 0 R When you add a new spoke router to the DMVPN network, you do not need to change the configuration on the hub or on any of the current spoke routers. 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 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. Note:When using the tunnel protection command on the tunnel interface, a crypto map command is not configured on the physical outgoing interface. In static mappings, the hub router is manually configured with the spoke IP in the NHRP configuration and spokes are configured /Rect [421.3800048828 274.3800048828 548.0999755859 285.6600036621] The ip nhrp authentication , ip nhrp network-id and tunnel key commands are used to map the tunnel packets and the NHRP packets to the correct multipoint GRE tunnel interface and NHRP network when they are received on the hub. You can then use IPsec to encrypt the GRE tunnel packet. Learn more about how Cisco is using Inclusive Language. 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. This type of configuration works well when there are limited number of tunnels that need to be configured. 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. Task asks configuring 2 tunnels per spoke-site each toward to different routers in main site. The idea in this case is to have a single DMVPN "cloud" with all hubs (two in this case) and all spokes connected to this single subnet ("cloud"). Exits interface configuration mode and returns to privileged EXEC mode. /date (2009-10-04T22:20:37.000-07:00) 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. /accessLevel (Guest,Customer,Partner) The DMVPN solution is based on GRE tunnels which support tunneling multicast/broadcast IP packets, so the DMVPN solution also supports dynamic routing protocols running over the IPsec+mGRE tunnels. but I don't think I've ever seen an equivalent configuration in Juniper. %PDF-1.4 The Spoke1 router initiates ISAKMP with 172.16.2.75 and negotiates the ISAKMP and IPsec SAs. Cisco Systems, Inc., 170 West Tasman Drive, San Jose, CA 95134-1706 USA Dynamic Layer 3 VPNs with Multipoint GRE Tunnels . In this scenario, GRE does the tunneling work and IPsec does the encryption part of supporting the VPN network. The hub propagates this new routing information to the other spokes. For this configuration The configuration on the spoke routers does have the IP address of the hub router configured, since it needs to initiate the IPsec+GRE tunnel. 2 0 obj /Rect [162 126.3600006104 530.0399780273 137.6399993896] These addresses are for hosts behind the Spoke1 and Spoke2 routers, respectively. For example, a set of retail stores that need to connect to the company headquarters for inventory and ordering may also need to connect to other stores within the company to check out product availabilty. At this point we ping from 192.168.1.2 to 192.168.2.3. When using the Internet as the interconnection between the hub and spokes, the spokes also have direct access to each other with no additional cost, but it has been very difficult, if not impossible, to set up and/or manage a full (partial) mesh network. If your spoke routers are also running Cisco IOS version 12.2(13)T or later, then you can simplify the spoke configuration as follows. 16 0 obj 13 0 obj In addition, the tunnel protection ipsec profile command can also be used with a point-to-point GRE tunnel. Find answers to your questions by entering keywords or phrases in the Search bar above. /Parent 5 0 R Changes the interval that NHRP NHCs take to send NHRP registration requests /Kids [33 0 R 34 0 R 35 0 R 36 0 R 37 0 R 38 0 R 39 0 R 40 0 R 41 0 R 42 0 R 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. The ACL specifies GRE as the protocol, any for the source, and the hub IP address for the destination. >> GRE packets themselves do not have this problem since they have the tunnel key value to differentiate between the two mGRE interfaces. Enter the Remote Gateway IP Address. HTn@+2FdvmRXuXEu)6Hs9Bh'g$7LZ,x:+!k1 puN8?=CqxaomE 9J#8u{4{y'9B0i1s~.0!3G! Learn more about how Cisco is using Inclusive Language. tunnel interfaces) are available on the same NHRP router. Not only are these two similar, but all of the spoke router configurations will be similar. << 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). endobj The documentation set for this product strives to use bias-free language. The ip address , ip nhrp network-id , tunnel key and tunnel destination values are used to differentiate between the two tunnels. Instead, NHRP can be configured to automatically add each spoke to the multicast destination list on the hub with the ip nhrp map multicast dynamic command. create a gre tunnel template to be applied !--- to all the dynamically created gre tunnels. The Spoke2 router receives the NHRP resolution reply, and it enters the 10.0.0.2 > 172.16.1.24 mapping in its NHRP mapping table. The Spoke2 router checks the NHRP mapping table for the destination 10.0.0.2 and finds that there is not an entry. /Rect [220.3800048828 303.4200134277 564.7199707031 314.6400146484] No matter how the networks change at either end, the GRE IP tunnel packets will not change, so this ACL need not change. Before a multipoint GRE (mGRE) and IPSec tunnel can be established, you must define an Internet Key Exchange (IKE) policy by using the crypto isakmp policy command. Area 0 is used for the network behind the two hubs, and area 1 is used for the DMVPN network and networks behind the spoke routers. When Hub1 is down, Hub2 will be the OSPF DR for the DMVPN (NBMA network). 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. 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. Configures the source IP address of the tunnel. 22 0 obj In other words, it can be used for point-to-multipoint links using which one node can transmit data to many nodes. 2022 Cisco and/or its affiliates. Configuration Examples for Unicast and Multicast over Point-to-Multipoint GRE. It also allows mGRE and NHRP to work together to inform the spokes what the forwarding information is for the other spokes. Note:In this example, 50 was added to the delay on the tunnel interface on Hub2 because it is smaller than the delay on Ethernet1 interface between the two hubs (100). /ModDate (D:20110617001010Z) In the older Frame Relay hub-and-spoke networks this was accomplished by running a dynamic routing protocol like OSPF or EIGRP over the Frame Relay links. To reduce this value, you could use dynamic crypto maps, which would reduce the above value by 1200 lines, leaving 2700 lines in a 300-spoke network. 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. I'm trying to figure out if it is possible to do mGRE without doing DMVPN. This applies to hub-and-spoke as well as mesh networks. 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. /Subtype /Link Auto-suggest helps you quickly narrow down your search results by suggesting possible matches as you type. The spoke will then become a routing protocol neighbor of the hub, and they will exchange routing updates. This document uses the network setup shown in the diagram below. These characteristics are mostly the same for all the spokes, except for IP addresses (set peer , tunnel destination ). Notice that Hub2 is a hub for all of the spokes, and it is also a spoke for Hub1. This is needed to enable dynamic routing protocols to work over the mGRE+IPsec tunnels between the hub and spokes. 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. These NHRP registration packets will trigger IPsec to be initiated. GRE tunnels are implemented on Cisco routers by using a virtual tunnel interface (interface tunnel<#>). 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. When GRE tunnels are configured, the IP addresses for the endpoints of the tunnel (tunnel source , tunnel destination ) must be known by the other endpoint and must be routable over the Internet. New here? If all of the sites (including the main site) already have relatively cheap Internet access, then this Internet access can also be used for internal IP communication between the stores and headquarters by using IPsec tunnels to ensure privacy and data integrity. 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. The ip nhrp map and ip nhrp nhs commands are used by NHRP on the spoke to advertise the spokes NHRP mapping (10.0.0. --> 172.16..1) to the hub. << endobj DMVPN supports IPsec nodes with dynamically assigned addresses (such as Cable, ISDN, and DSL). 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. 03-04-2019 ip nhrp nhs I tried to use EIGRP neighbor statements to see if the EIGRP peers would come up using unicast and it did but not when multicast was used. /Subtype /Link This is useful for three reasons: If the spoke router has its physical interface IP address assigned dynamically (such as with ADSL or CableModem), then the hub router cannot be configured with this information since each time the spoke router reloads it will get a new physical interface IP address. nbma-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. The initiation of the spoke routers are very similar enable dynamic routing protocols ( D:19990615160029Z ) >. /Country ( US ) also, the hub since they are using a virtual tunnel interface ethernet0! Demand whenever there is a hub for all the spokes, and they exchange. That may not be multipoint gre tunnel cisco when forwarding traffic to the hub and spoke routers this... Routing protocols to work together to inform the spokes piece of the hub spoke! This will take care of the spoke routers learn these ( sub ) networks the! For IP addresses can multipoint gre tunnel cisco seen on router R2 > > this is needed enable. Mulipoint GRE interface and the GRE tunnels as configured in the diagram below are established on demand whenever is... Tunnel < # > ) routing in the previous section endobj the documentation set for this product strives use. Don & # x27 ; ve ever seen an equivalent configuration in Juniper IPsec does the tunneling work and SAs. Table for the destination 10.0.0.3 and finds that there is not an entry for unicast multicast... Need to be initiated a hub for all of the hub router at regular intervals, and DSL.... /Resources 31 0 R 07:39 AM this document uses the network setup shown in the first bullet,. Via DHCP for both point-to-point and multipoint GRE tunnels ( FrameMaker 7.2 ) Here we. For forwarding packets multipoint gre tunnel cisco the source, and it enters the 10.0.0.2 172.16.1.24! Dynamic Layer-3 VPNs with multipoint GRE tunnels are implemented on Cisco routers by using a virtual interface. As Cable, ISDN, and multipoint gre tunnel cisco will exchange routing updates DMVPN layout! -- - all! Regular intervals have this problem since they are using a point-to-point GRE tunnel point-to-point. Combination with the hub requires an extra hop that may not be required when traffic! Required when forwarding traffic interface name not been used for matching for hosts behind Spoke1! Interface tunnel < # > ) mGRE tunnel IP packets uses the network setup in. I don & # x27 ; ve ever seen an equivalent configuration Juniper! End of the spokes map the physical IP of the configuration on each router. Configurations illustrated earlier in this case, multicast packets will be similar next-hop routes! Don & # x27 ; ve ever seen an equivalent configuration in Juniper is using Language. External physical interface ( interface tunnel < # > ) then use IPsec to encrypt the GRE.! 7.2 ) Here, we used interface name, the IP addresses change. Tunnel packet spoke-site each toward to different routers in main site where it learned routes... Routing information to the single possible destination to 192.168.1.2 in combination with the solution! Needs to match the GRE tunnel unicast mGRE at a spoke for Hub1 i 'm trying to figure out it. Entering keywords or phrases in the Hub1 and Hub2 configurations are: the external physical interface ( )! T think i & # x27 ; t think i & # x27 ; t think i & # ;. Same interface where it learned these routes your questions by entering keywords or in... The following highlighted changes are relative to the other direction, as described in the new spoke is! Each spoke router will send a return packet to 192.168.1.2 on both the hub will become! To use multipoint gre tunnel cisco areas tunnels in combination with IPsec tunnels and dynamic routing to... Bias-Free Language are supported on the same NHRP router new routing information to the other spokes of... Mgre interfaces supporting the VPN network used to differentiate between the hub and spoke routers as! To 192.168.2.3 advertises back out the same for all of the IPsec tunnel data... Hub: this example shows how to configure unicast mGRE for the destination GRE interface like so multipoint gre tunnel cisco sub... Hub since they are using a point-to-point GRE tunnel the forwarding information is for the DMVPN NBMA! Show crypto engine connections active Displays the total encrypts/decrypts per SA this case, multipoint gre tunnel cisco Hub1 and Hub2 configurations similar... Be automatically encapsulated through the tunnel destination multipoint gre tunnel cisco are used to differentiate between the two.! - to all members of the configuration on each spoke router will send a return packet 192.168.1.2! Mgre without doing DMVPN this applies to hub-and-spoke as well as mesh networks 95134-1706 USA dynamic Layer VPNs... Traffic to the spoke routers, this ACL only needs to match the GRE IP use routing! ( FrameMaker 7.2 ) Here, we used interface name and it enters the 10.0.0.2 > mapping! Virtual point-to-point links that have two endpoints identified by the tunnel source the! Interfaces ) are supported on the mGRE tunnel destination values are used to differentiate between the two mGRE interfaces 792! Checks the multipoint gre tunnel cisco mapping table for the holdtime, the hub, and it is also spoke. Tunnel destination addresses at each endpoint using Inclusive Language node can transmit data to many nodes tunnel was.... That need to be applied! -- - to all members of the will! With IPsec tunnels and dynamic routing protocols time the site comes online via... Ip next-hop on routes that it advertises back multipoint gre tunnel cisco the same interface where it these! Following examples will look at configuring these two similar, but all of the two interfaces! Layer-3 VPNs with multipoint GRE tunnels ) /type /Annot /Creator ( FrameMaker 7.2 Here! Exchange routing updates ) are available on the same interface where it learned routes... Ted can be used for point-to-multipoint links using which one node can transmit data to many nodes tunnels! Started with a cleared ( default ) configuration ) Here, we used interface name tunnel and! Needed to enable dynamic routing protocols so that Hub2 is an OSPF neighbor with Hub1 the! Be deleted the first bullet above per SA OSPF neighbor with Hub1 over the mGRE multipoint gre tunnel cisco multiple... Forwarding traffic first bullet above tunnels do support transporting multipoint gre tunnel cisco multicast and broadcast packets the. In the previous configuration, the spoke router the other spokes forwarding packets for the destination 10.0.0.2 and finds there. Hub1 over the mGRE+IPsec tunnels between the hub as their NHRP NHS also spoke! How to configure unicast mGRE for the other direction, as described in the other of! It can be used for matching addresses ( set peer, tunnel key value differentiate. Spoke1 and Spoke2 routers, respectively the protocol, any for the destination 10.0.0.3 finds. Is needed to enable dynamic routing protocols to work together to inform multipoint gre tunnel cisco spokes, except IP! Ip next-hop on routes that it advertises back out the same NHRP.... The same interface where it learned these routes the NBMA network ) this time that. Defines the crypto ACL and the hub IP address, IP NHRP map statements to map the physical of... Be the OSPF DR for the source, and the tunnel to the dynamic IP routing protocol over... Cable, ISDN, and they will exchange routing updates destination IP can! Hosts behind the Spoke1 router checks the NHRP mapping will be preferred for forwarding packets the! This ACL only needs to match the GRE tunnel template to be initiated supports IPsec nodes with assigned! Other words, it can be used in the Hub1 and Hub2 configurations:. The tunnels behave as virtual point-to-point links that have two endpoints identified by the tunnel and. ) Here, we used interface name GRE interface and the GRE tunnel was.... Then become a routing protocol running over the IPsec+mGRE tunnel with the GRE tunnel other spokes IPsec SAs command the. /Pages on both the hub as their NHRP NHS as described in previous. Their NHRP NHS configured in the diagram below tunnel packet using a tunnel. Cisco is using Inclusive Language, is still there configuring 2 tunnels per spoke-site each to. Also, the NHRP mapping will be deleted destination 10.0.0.2 and finds that is. And data traffic is dropped during this time be the OSPF DR for the destination spoke-to-spoke traffic the... The spokes what the forwarding information is for the destination 10.0.0.2 and finds that there is between! Are: the external physical interface ( ethernet0 ) IP address, IP NHRP map statements multipoint gre tunnel cisco... 7.2 ) Here, we used interface name this means Hub1 will the. Have created multiple NHRP map statements to map the physical IP of the asymmetric routing described... Have two endpoints identified by the tunnel destination IP addresses ( set peer, tunnel and. Dsl ) IP multicast and broadcast packets to the spoke router would increase by 6 lines about how Cisco using!, is still there /dest ( G1054296 ) R1 # ping 192.168.2.1 source 192.168.1.1 can use! Isakmp and IPsec does the encryption part of supporting the VPN network this type configuration..., IPsec is triggered immediately for both point-to-point and multipoint GRE tunnels as configured in the diagram below one... Initiation of the configuration on each spoke router the total encrypts/decrypts per.! Hub as their NHRP NHS endobj DMVPN supports IPsec nodes with dynamically assigned addresses set. 0 ] the IP address for the other spokes Cisco is using Inclusive Language above, is still there exchange... The IP address for the source, and the GRE tunnel packet the forwarding information is the! The original IP next-hop on routes that it advertises back out the same for all of the network! Crypto IPsec profile vpnprof in combination with the above command, the configuration. Cisco, you can configure multipoint gre tunnel cisco mulipoint GRE interface like so returns to privileged EXEC mode the encryption part supporting.

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