The topology is named Spanning Tree, because it is constructed as a loop-free active forwarding topology, meaning that it is a tree-type topology that spans the entire network. And put everything together with a crypto map. Cisco SD-WAN Hub and Spoke Topology; Cisco SD-WAN Application-Aware Routing; 2.1.d: Assurance. If you had another router behind R3 running OSPF, you would still see the redistributed routes with a metric of 20. Heres the configuration: R1 & R2 (config)#router ospf 1 (config-router)#network 192.168.12.0 0.0.0.255 area 0. We successfully redistributed OSPF into EIGRP and vice versa but just to be sure, lets see if we have connectivity between R1 and R3. When two branch routers want to tunnel some traffic,how do they know what IP addresses to use? Q: Since under Phase 2, based on the 2nd trace route showing a single hop, it seems the spokes already bypass the hub, meaning the source spoke gets to remote spoke optimally, is the Phase 3 configuration then become superfluous? Cisco 1900 Series Integrated Services Routers build on 25 years of Cisco innovation and product leadership. Benefits. 3.4a: RIP Version 2. Our peer is 192.168.23.3, the transform-set is called MYTRANSFORMSET and everything that matches access-list 100 should be encrypted by IPSEC: The first two commands are what Phase-2 is really about. Lets verify our work. Metalowa 5, 60-118 Pozna, Poland Heres an example: In the picture above we have an ISP that has the global prefix 2001:DB8:1100::/40 that it can assign to customers. group 2 lifetime 86400. Well keep it simple for now and just redistribute all OSPF routes into EIGRP. You can find out more information about those at the following lesson: https://networklessons.com/cisco/ccie-enterprise-infrastructure/ospf-path-selection-explained. Back in the 90s, PPP was also commonly used for internet dial-up connections. In our example, thats process ID 1. This is conceptually similar to an OSPF process ID. Cisco 2900 Series Integrated Services Routers build on 25 years of Cisco innovation and product leadership. A while back, I wrote this post about using OSPF in a DMVPN phase 3. The NHS is theNext Hop Server. Step 2. Here is the topology well use: Lets start with the ISP router. The CGR 2010 and the CGR 2520 are deployed in both transmission and distribution substations. DMVPN (Dynamic Multipoint VPN) is a routing technique we can use to build a VPN network with multiple sites without having to statically configure all devices. The 1 is the group number for HSRP. We need to enable IPv6 unicast routing: ISP(config)#ipv6 unicast-routing The global prefix is configured with the ipv6 local pool command: ISP(config)#ipv6 local pool GLOBAL_POOL 2001:DB8:1100::/40 48 This tells the router that we have a pool called GLOBAL_POOL and that we can use the entire 2001:DB8:1100::/40 prefix. There are three options you can choose from: With the match option, we can choose to redistribute only specific OSPF routes like external or internal routes. Routing protocols such as OSPF, EIGRP v1 or v2 or BGP are generally run between the hub and spoke to allow for growth and scalability. So before we start, lets take a look at the lab well be working with. Phase 1 creates the first tunnel, which protects later ISAKMP negotiation messages. The new platforms are architected to enable the next phase of branch-office evolution, providing rich media collaboration and virtualization to the branch while maximizing operational cost savings The Integrated Services Routers Generation 2 platforms are Spoke-2 will be configured in almost the exact same way, so I wont include all the details here. Think about GRE for a moment. This completes the installation phase of the Cisco VPN client on Windows 10. So although that example works well, its missing one more component to test both your example and my need You need a router beyond the ISP router to insure you can reach the hosts from an extended ISP network. Instead of mapping L2 to L3 information, we are now mapping a tunnel IP address to a NBMA IPaddress. There are two parts to this; NHRP redirects on the hub, and shortcut routes on the spokes. Among other useful information in this section, it states that: Hi REne and staff, Figure 2 shows a converged end-to-end IP network from the data center to the home. GRE headers include two critical pieces of information; The source IP address and the destination IP address. This timed address is preferre. (LogOut/ dynamic multipoint VPN (DMVPN): A dynamic multipoint virtual private network (DMVPN) is a secure network that exchanges data between sites without needing to pass traffic through an organization's headquarter virtual private network (VPN) server or router . ISAKMP, also called IKE (Internet Key Exchange), is the negotiation protocol that allows two hosts to agree on how to build an IPsec security association. Ive informed Rene to fix the ShildSquare Captcha link. Lab files are available for download if you want to see the initial configuration. It prevents Layer 2 loops in a network. Set static summary/default routes on the spokes pointing to the hub. Phase 1 creates the first tunnel, which protects later ISAKMP negotiation messages. Throughout this article, were going to use the topology shown below. The new platforms are architected to enable the next phase of branch-office evolution, providing Other things to note are the fact that I put R1s loopback into area 0 to represent the rest of our network, and that the DMVPN is running point-to-multipoint. Thank you for the very helpful post. This completes the installation phase of the Cisco VPN client on Windows 10. Phase 2 (IPsec) Configuration Complete these steps for the Phase 2 configuration: Create an access list which defines the traffic to be encrypted and through the tunnel. Step 2. First, we (optionally) set authentication. PPP (Point to Point Protocol) was originally used on serial interfaces for point-to-point interfaces. Its a great backup or alternative to private networks like MPLS VPN. Lets try a quick traceroute from H1: Product Overview. Nothing special, just regular OSPF. Change), You are commenting using your Facebook account. R1 and R3 can only reach each other by going through R2 so it doesnt matter whether the metric is high or low. Its possible to have NHRP enabled on more than one interface on a router. Its just a matter of understanding the Lab diagram and the underlay network. Our goals now are: We can achieve both of those with 2 steps. If not, run a ping to force the spoke to register with the hub. Spoke1now knows the destination public IP address of spoke2 and is able to tunnel something directly. This is conceptually similar to an OSPF process ID. The underlay network is the network we use for connectivity between the different routers, for example the Internet. This allows remote users to connect to the ASA and access the remote network through an IPsec encrypted tunnel. A while back, I wrote this post about using OSPF in a DMVPN phase 3. Now well configure phase 2 with the transform-set: R1(config)#crypto ipsec transform-set MYTRANSFORMSET esp-aes esp-sha-hmac. Ask a question or join the discussion by visiting our Community Forum, Get Full Access to our 751 Cisco Lessons Now, Instead of specifying the metric as I did above, you can also use the, D 1.1.1.1 [90/130816] via 192.168.12.1, O 3.3.3.3 [110/2] via 192.168.23.3, O E2 192.168.12.0/24 [110/20] via 192.168.23.2, Introduction to Administrative Distance (AD), 1.2.f: Route filtering with any routing protocol, 1.2.g: Manual summarization with any routing protocol, 1.2.j: Bidirectional Forwarding Detection (BFD), 1.3.f: Optimization, Convergence, and Scalability, EIGRP Loop Free Alternate (LFA) Fast Reroute (FRR), OSPF Network Type: Point-to-Multipoint Non-Broadcast, OSPF Generic TTL Security Mechanism (GTSM), 1.4.e: Optimization, Convergence, and Scalability, OSPF SPF Scheduling Tuning with SPF Throttling, OSPF Loop Free Alternate (LFA) Fast Reroute (FRR), Single/Dual Homed and Multi-homed Designs, IGMP Snooping without Router (IGMP Querier), Multicast Auto-RP Mapping Agent behind Spoke, Multicast Source Specific Multicast (SSM), Cisco Locator ID Separation Protocol (LISP), Cisco SD-WAN Plug and Play Connect Device Licenses, Cisco SD-WAN Device and Feature Templates, Cisco SD-WAN Localized Data Policy (Policer), Cisco SD-WAN Localized Control Policy (BGP), Unit 3: Transport Technologies and Solutions, MPLS L3 VPN PE-CE OSPF Global Default Route, FlexVPN Site-to-Site without Smart Defaults, Unit 4: Infrastructure Security and Services, 4.2.c: IPv6 Infrastructure Security Features, 4.2.d: IEEE 802.1X Port-Based Authentication, QoS Network Based Application Recognition (NBAR), QoS Shaping with burst up to interface speed, Virtual Router Redundancy Protocol (VRRP), Introduction to Network Time Protocol (NTP), Troubleshooting IPv6 Stateless Autoconfiguration, Unit 5: Infrastructure Automation and Programmability. This needs to be statically configured. Capturing packets betwen host 192.168.3.2 and Firewall.cx. DMVPN has three phases that route data differently. Example: if packet length > Network Maintenance The spoke routers use a similar configuration to the hub. Root Guard configuration. The default metric-type for redistributed routes in OSPF is E2 which means that the metric remains the same throughout the OSPF network. Cut down the OSPF database so we dont have LSAs for every DMVPN spoke. And put everything together with a crypto map. See the lab if you want to see it in action. We need to enable IPv6 unicast routing: ISP(config)#ipv6 unicast-routing The global prefix is configured with the ipv6 local pool command: ISP(config)#ipv6 local pool GLOBAL_POOL 2001:DB8:1100::/40 48 This tells the router that we have a pool called GLOBAL_POOL and that we can use the entire 2001:DB8:1100::/40 prefix. RIP Configuration; RIP Timers; Troubleshooting RIP; 3.4b: RIPng (RIP IPv6) IPv6 RIPNG; IPv6 RIPNG Troubleshooting; 3.5: EIGRP. The route-map is another option only to redistribute specific OSPF routes, for example, by using an access-list. 192.168.1.254 will be the virtual gateway IP address. [maxbutton id=4 url=https://networkdirection.net/articles/routingandswitching/gretunnels/ text=GRE ][maxbutton id=4 url=https://networkdirection.net/articles/routingandswitching/gretunnels/advancedgre/ text=Advanced GRE ][maxbutton id=4 url=https://networkdirection.net/articles/routingandswitching/dmvpn/ text=DMVPN ]. Want to take a look for yourself? Phase 2 creates the tunnel that protects data. Figure 2. Benefits. Now we need to configure the DHCP server: I refer to the pool we just created and add some extrainformation like the google DNS servers and a domain name. Network Maintenance Suddenly the link fails: Heres what will happen: Ill paste the spoke configs. On the interface that connects to the customers, I configure an IPv6 address that does not fall within the range of the global prefix (if you try, you get an error) and the DHCP server needs to be activated on the interface: That completes the ISP router configuration. This allows the hub to send the NHRP redirects and also allows the hub to advertise the routes to area 0 and the rest of your network. Phase three changes the way routing works. These entries also show up as shortcuts in the NHRP table. ; Incoming banner: used for users that connect through reverse telnet. VRF+MPLS is a good option if you want multi-tenancy on your DMVPN, but not everyone does. Let me show you what Im talking about: Above we have our HQ and two branch routers, branch1and branch2. Well keep it simple and use 1 for all metric values: Redistribution from OSPF into EIGRP is now configured. Lets say that we have the following requirements: To accomplish this we will have to configure a bunch of GRE tunnels which will look like this: Thing will get messy quicklywe have to create multiple tunnel interfaces, set the source/destination IP addresses etc. The overlay network is our private network with GRE tunnels. We do this under the EIGRP process: Lets take a look at the redistribute ospf options: We need to select the correct OSPF process. Make sure you enable IPv6 unicast routing: The interface that connects to the ISP router will use DHCP client: The prefix that we receive will be stored as ISP_PREFIX. Its possible to have NHRP enabled on more than one interface on a router. ; Login banner: this one is displayed just before the authentication prompt. +48 61 271 04 43 Lets start with the ISP router. Both EIGRP and BGP allow a higher number of supported spokes per hub. On each of our hosts, we use autoconfiguration: Lets take a closer look at our DHCP pool: The output above tells us that we have two clients and that the ISP router uses the GLOBAL_POOL for the prefix. 3.4a: RIP Version 2. Lets take a closer look at those two DHCP clients: The output above is interesting as it tells us which prefixes the router assigned to the DHCP clients. z o.o. Notice that there is no tunnel destination address? Lets go to the OSPF process: And take a look at the redistribute eigrp options. Cisco 2900 Series Integrated Services Routers build on 25 years of Cisco innovation and product leadership. Cisco SD-WAN OSPF Configuration; Cisco SD-WAN BGP Configuration; 2.2.d: Localized Policies. In this example, the source traffic of interesting subnet would be from the 172.16.100.0/24 subnet to the 192.168.10.0/24. We are also getting a summary route from the Hub, which is the ABR. When we talk about DMVPN, we often refer to an underlay and overlay network: DMVPN has different versions which we call phases, theres three of them: Let me give you an overview of the three phases: With phase 1 we use NHRP so that spokes can register themselves with the hub. R1 is in network 192.168.1.0 /24 while R2 is in 192.168.2.0 /24. Well start by configuring tunnel 0 on the hub router. Vendor agnostic technology (IEEE 802.1Q) OSPF Spoke example; DMVPN Phase 2 Single Hub EIGRP Hub example; DMVPN Phase 2 Single Hub EIGRP Spoke example; Change). ISP. This means that were not going to investigate dynamic routing (there will be a future article on this later), or adding IPSec. Multicast will still work, but NHRP will need to get involved. The Root Guard feature is responsible for verifying if the port on which it was enabled is a designated port. Itwill work but its not a very scalable solution. Thats the magic of phase 3! The topology we will be working with looks like this: Once we have the interfaces configured, well set up the DMVPN with the following configurations: The first thing youll notice is that we are putting the DMVPN into a total NSSA. Cisco 2900 Series Integrated Services Routers build on 25 years of Cisco innovation and product leadership. DMVPN is initially configured to build out a hub-and-spoke network by statically configuring the hubs Cisco Dynamic Multipoint VPN (DMVPN) is a Cisco IOS Software-based security solution for building scalable enterprise VPNs that support distributed applications such as voice and video (Figure 1).. Cisco DMVPN is widely used to combine enterprise branch, teleworker, and extranet connectivity. For security reasons Cisco recommend that customers use AES.[6]. ISAKMP negotiation consists of two phases: Phase 1 and Phase 2. The idea behind ZBF is that we dont assign access-lists to interfaces but we will create different zones.Interfaces will be assigned to the different zones and security policies will be assigned to traffic between zones.To show you why ZBF is useful, let me show you a picture: NIP 7792433527 ISAKMP negotiation consists of two phases: Phase 1 and Phase 2. Good point on passing traffic through hub for security purposes. Fill in your details below or click an icon to log in: You are commenting using your WordPress.com account. I cant think of any advantages right now that phase 2 has over phase 3 so if you implement this, yo I appreciate your time Thanks. Cisco SD-WAN OSPF Configuration; Cisco SD-WAN BGP Configuration; 2.2.d: Localized Policies. We can test this with a quick ping between the loopback interfaces: Want to take a look for yourself? Heres the configuration: R1 & R2 (config)#router ospf 1 (config-router)#network 192.168.12.0 0.0.0.255 area 0. Suddenly the link fails: Heres what will happen: This would normally only matter in a large deployment. The goal is to ensure that R1 and R2 can communicate with each other through the IPsec tunnel. Specifically, the [EUI/CAL/PRE] acronyms you mention are indicating that: EUI - Extended Unique Identifier. As a result, all OSPF routes are now gone. Here is why: Hello, We need something that helps our branch1router figure out what thepublic IP address is of the branch2 router, we do this with a protocol calledNHRP (Next Hop Resolution Protocol). Multicast addresses cant be used as the destination address in an NBMA network. I recommend watching some of the DMVPN videos on Cisco Live on demand, as they describe these options in detail. We can do the exact same thing on this router as we did on C1: The only difference is that I use a different specific prefix (subnet) on this router. Trunk port configuration example to carry the different VLAN tags between two devices on the same physical link. As you can see, those protocols work great because the hierarchy is arbitrary. Otherwise, its more effective to allow spoke-to-spoke traffic. Phase 2 creates the tunnel that protects data. Each router is connected to the Internet and has a public IP address: On the GRE multipoint tunnel interface we use a single subnet with the following private IP addresses: Lets say that we want to send a ping from branch1s tunnel interface to the tunnel interface of branch2. 'Monitor' commands are only stored in the router's RAM and are lost after a router reboot. Phase 3 also has some extra features which I didnt get into here. Just send multicast packets to the NHS (hub router) and let it manage it from there. Phase 1 of IPsec is used to establish a secure channel between the Unit 2: LAN QoS. Cisco SD-WAN OSPF Configuration; Cisco SD-WAN BGP Configuration; 2.2.d: Localized Policies. Later oncewe look at the configurations you will see that the destination IP address of the hub router will be statically configured on the spoke routers. In phase 2, all spoke routers use multipoint GRE tunnels so we do have direct spoke to spoke tunneling. Product Names: CISCO1941/K9, CISCO1941W-A/K9, CISCO1941W-P/K9, CISCO1941W-N/K9, CISCO1941W-C/K9, CISCO1941W-I/K9, and CISCO 1941W-T/K9. This is because we dont want to flood LSAs from the rest of the network into the area. I hope youre doing very well? Example: if packet length > Later on well add a third command to configure multicast. Phone: +1 302 691 9410 Once thats done, we should be able to ping between the loopback interfaces of R1 and R3. Lets take a look at an update message from R1: R1(config)#router bgp 1 R1(config-router)#network 1.1.1.1 mask 255.255.255.255 As you can guess, this command filters all outgoing LSAs on an interface. The Root Guard feature is responsible for verifying if the port on which it was enabled is a designated port. Trunk port configuration example to carry the different VLAN tags between two devices on the same physical link. If you want to see examples of this in action, take a look at how EIGRP and BGP work over DMVPN. Both phase 2 and 3 allow spoke-to-spoke traffic, the advantage of phase 3 is that we use the shortcuts so you dont need specific entries anymore in the routing tables of the spoke routers. ISAKMP negotiation consists of two phases: Phase 1 and Phase 2. RIP Configuration; RIP Timers; Troubleshooting RIP; 3.4b: RIPng (RIP IPv6) IPv6 RIPNG; IPv6 RIPNG Troubleshooting; 3.5: EIGRP. The configuration above uses two lines to configure the connection to the NHS; Defining the NHS and mapping the tunnel IP to the NBMA address. Cisco Dynamic Multipoint VPN (DMVPN) is a Cisco IOS Software-based security solution for building scalable enterprise VPNs that support distributed applications such as voice and video (Figure 1).. Cisco DMVPN is widely used to combine enterprise branch, teleworker, and extranet connectivity. Hi, group 2 lifetime 86400. Cisco IOS routers support a number of banners, here they are: MOTD banner: the message of the day banner is presented to everyone that connects to the router. It is not sent to any other router, so you can basically set this to whatever you want. This allows remote users to connect to the ASA and access the remote network through an IPsec encrypted tunnel. Static GRE is out, and mGRE is in. QoS on LAN Switches; QoS Trust Boundary; Classification and Marking on Switch; Queuing on 3560/3750 Switches; Unit 3 : Shaping. Cisco IR829 Industrial Integrated Services Routers are ruggedized integrated services routers designed for deployment in harsh industrial environments.. However, you are still able to click it and after you perform the Captcha test, you can successfully go to the lesson. You have now learned how to redistribute routes between EIGRP and OSPF and how to verify reachability. Cisco IOS routers support a number of banners, here they are: MOTD banner: the message of the day banner is presented to everyone that connects to the router. What Ive been having problems with is that the router that is issuing the PD for whatever reason (labeled ISP in your example) is not putting the route in its local routing table (for redistribut. One of the advantages of PPP is that you can use it to assign an IP address to the other end. EIGRP Packets Explained; EIGRP Hold Time and Hello Packets; 3.5b: Neighbor Relationship. PPP (Point to Point Protocol) was originally used on serial interfaces for point-to-point interfaces. I have already dabbled in some DMVPN labs, including the dual hub kind, notwithstanding, your post certainly afforded me valuable greater insight. The ID tells the router if the interfaces are in the same domain or not. Make sure you select the correct EIGRP AS number (12 in our example): There are a number of (advanced) options which well ignore for now. The different versions are like an evolution of DMVPN. 200 Vesey Street Starting with the hub tunnel configuration: The configuration changes made was the removal of the summary route as that would cause the next-hop address to become the hub and therefore cause the data-plane to flow through the hub. Both phase 2 and 3 allow spoke-to-spoke traffic, the advantage of phase 3 is that we use the shortcuts so you dont need specific entries anymore in the routing tables of the spoke routers. Cisco SD-WAN Hub and Spoke Topology; Cisco SD-WAN Application-Aware Routing; 2.1.d: Assurance. I cant think of any advantages right now that phase 2 has over phase 3 so if you implement this, yo Enter a value in the range 0 to 61440. Here is why: When would we choose to use Phase 1, 2, or 3, and why? when we decide E1 or E2 . When we configure point-to-point GRE tunnels we have to configure a source and destination IP address that are used to build the GRE tunnel. These are part of the output of the show ipv6 interface command. There are two commands relating to NHRP. Starting with the hub tunnel configuration: The configuration changes made was the removal of the summary route as that would cause the next-hop address to become the hub and therefore cause the data-plane to flow through the hub. The 1 is the group number for HSRP. This is the hub router. [5], As with GRE tunnels, DMVPN allows for several encryption schemes (including none) for the encryption of data traversing the tunnels. I mean in real life scenarios when we dicde to go for E1 and E2 ul. The idea behind ZBF is that we dont assign access-lists to interfaces but we will create different zones.Interfaces will be assigned to the different zones and security policies will be assigned to traffic between zones.To show you why ZBF is useful, let me show you a picture: Nothing special, just regular OSPF. NTP (Network Time Protocol) is used to allow network devices to synchronize their clocks with a central source clock. To recap, it looks like this: YouTube Channel: https://www.youtube.com/channel/UCOXqQWa6qBHBFzdkoYG4Kvg The goal is to ensure that R1 and R2 can communicate with each other through the IPsec tunnel. This is a pretty simple and elegant solution for using OSPF over phase 3 DMVPN. There are no differences on the hub, so were going to skip straight to the spoke routers. Now you might be wondering, what about the requirement where branch office 1/2 and branch office 3/4 have a direct tunnel? dynamic multipoint VPN (DMVPN): A dynamic multipoint virtual private network (DMVPN) is a secure network that exchanges data between sites without needing to pass traffic through an organization's headquarter virtual private network (VPN) server or router . I want to know [EUI/CAL/PRE] what does it mean please? Perhaps for another DMVPN network, or some other use. The first thing well do is enable HSRP. The IR829 Industrial Integrated Services Routers (IR829) have a compact form factor, multimode 4G LTE and 3G wireless WAN (dual active LTE and single LTE models), IEEE 802.11a/b/g/n WLAN, Ethernet (RJ45 The shortcut command allows the spoke to accept the redirect message from the hub, and install the shortcut route. When we use them, our picture could look like this: When we use GRE Multipoint, there will be only one tunnel interface on each router. The hub, our NHRP server will create a mapping between the public IP addresses and the IP addresses of the tunnel interfaces. DMVPN is initially configured to build out a hub-and-spoke network by statically configuring the hubs This completes the installation phase of the Cisco VPN client on Windows 10. Major benefits include: On-demand full mesh This is conceptually similar to an OSPF process ID. Next, we set the NHRP Network ID. As mentioned before, the device is in RSTP mode. In fact its not even the only multitenancy options (multi-tunnel in phase 3 for example). thanks for your work (it is not pretented), https://cdn-forum.networklessons.com/uploads/default/original/2X/7/7335742f2d5451e7b58476dedc8f9cf0a05ac174.png, and i test some other prefix values for the global pool, When the global pool is /40 (like in the lesson) the delegation is between 40 and 56, https://cdn-forum.networklessons.com/uploads/default/original/2X/6/6a667fe33f1c8b8e10960d6355494027e44d51f7.jpeg, when the global pool is /32 the delegation is between 32 and 48, https://cdn-forum.networklessons.com/uploads/default, 10 more replies! If the device is required to be the root bridge, set the root bridge priority to a value lower than 32768. To see how this affects the routing table, weve added in some static routes. A while back, I wrote this post about using OSPF in a DMVPN phase 3. RIP Configuration; RIP Timers; Troubleshooting RIP; 3.4b: RIPng (RIP IPv6) IPv6 RIPNG; IPv6 RIPNG Troubleshooting; 3.5: EIGRP. Figure 2. The final part on DMVPN phase 2 is to briefly look at the configuration changes made to enable this phase. Example: if packet length > Introduction to EIGRP; 3.5a: Packet Types. If you have any specific questions about this lesson please let us know. Email: info@grandmetric.com, Grandmetric Sp. Phase 1 Configuration. ; Login banner: this one is displayed just before the authentication prompt. Phase 2 (IPsec) Configuration Complete these steps for the Phase 2 configuration: Create an access list which defines the traffic to be encrypted and through the tunnel. This is conceptually similar to an OSPF process ID. One of the advantages of PPP is that you can use it to assign an IP address to the other end. Since our traffic has to go through the hub, our routing configuration will be quite simple. To start with, we can see the summary route (10.0.0.0 /8) pointing to the hub: Next, well generate some traffic between the spokes: Now the interesting part. Heres an an illustration of how NHRP works with multipoint GRE: Above we have two spoke routers (NHRP clients) which establish a tunnel to the hub router. We will use this on the interface that connects to our hosts to configure an IPv6 address: In the IPv6 address command, I referto our ISP_PREFIX so that the router starts the address with that prefix. So, the solution is to manually map multicast to the NHS. ISP. This ID is made up of two parts: 8192 being the devices root bridge priority in hexadecimal, and xxxxxxxxxxxx the devices MAC address. PRE - Preferred. 55 more replies! Phase 2 (IPsec) Configuration Complete these steps for the Phase 2 configuration: Create an access list which defines the traffic to be encrypted and through the tunnel. https://www.cisco.com/c/en/us/td/docs/routers/asr903/software/guide/ip/16-6-1/b-dhcp-xe-16-6-asr900/implementing_dhcp_for_ipv6.html#GUID-82004112-75D9-4114-A19C-B0B8B75DC21B. We dont really use phase 1 anymore unless you have a really good reason why you want to force all traffic through the hub (security perhaps?). 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