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Does DMVPN support BGP?

by Rhyley Bryan

Does DMVPN support BGP?

We will also employ BGP as the routing protocol in the DMVPN cloud. In our DMVPN cloud, we will run eBGP between the hubs and spokes, and eBGP between the hubs. To get around the issue of requiring static neighbors, we will use dynamic neighbors in BGP.

How do I set up a DMVPN?

Four Steps to Fully Configure Cisco DMVPN

  1. Configure the DMVPN Hub.
  2. Configure the DMVPN Spoke(s)
  3. Protect the mGRE tunnels with IPSecurity (optional)
  4. Configure Routing Between DMVPN mGRE Tunnels (static routing or routing protocol)

What is DMVPN configuration?

The Dynamic Multipoint VPN (DMVPN) feature allows users to better scale large and small IPSec VPNs by combining generic routing encapsulation (GRE) tunnels, IPSec encryption, and Next Hop Resolution Protocol (NHRP) to provide users with easy configuration through crypto profiles, which override the requirement for …

Which routing protocol does DMVPN support?

DMVPN supports routing protocols like RIP, OSPF, EIGRP and BGP.

What is BGP listen range?

Using the BGP Listen Range command you specify a range of IP addresses typically on your Hub site (maybe in a DMVPN environment) that you trust to become BGP neigbors with you. When a TCP request on port 179 is received from one of those trusted IP’s a new BGP neighor is dynamically created.

What are the three phases of DMVPN?

In its simplest form, DMVPN is a point-to-multipoint Layer 3 overlay VPN enabling logical hub and spoke topology supporting direct spoke-to-spoke communications depending on DMVPN design ( Phase 1, Phase 2 and Phase 3 ) selection.

What is IP NHRP shortcut?

NHRP shortcut switching is now a feature in the CEF output feature switching path. For each data packet that is forwarded out the multipoint Generic Routing Encapsulation (mGRE) interface, NHRP performs a lookup in its mapping table to find an entry for the destination IP address of the data packet.

How do I check my DMVPN?

Verify the basic connectivity

  1. Ping from the hub to the spoke’s using NBMA addresses and reverse.
  2. Also, use traceroute to check the path that the encrypted tunnel packets are taking.
  3. Use the debug and show commands to verify no connectivity:

Why do we use DMVPN?

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. It’s a “hub and spoke” network where the spokes will be able to communicate with each other directly without having to go through the hub.

What is BGP peer group?

Requirements of Peer Groups You can customize the inbound update policy for any member of a peer group. A peer group must be either internal (with internal BGP (iBGP) members) or external (with external BGP (eBGP) members). Members of an external peer group have different autonomous system (AS) numbers.

What is dynamic BGP?

BGP dynamic routing¶ BGP dynamic routing enables advertisement of self-service (private) network prefixes to physical network devices that support BGP such as routers, thus removing the conventional dependency on static routes. BGP dynamic routing consists of a service plug-in and an agent.

How does DMVPN work?

How to use BGP in DMVPN Phase 2?

So far so good, time to configure BGP. This configuration will be similar to what we used for BGP on DMVPN phase 2. Our spoke routers don’t need to know any specific routes so we can use a default route. We’ll use dynamic BGP peers so that we don’t have to configure static neighbors. Let’s start with the default route:

Which is the default route for DMVPN Phase 2?

This configuration will be similar to what we used for BGP on DMVPN phase 2. Our spoke routers don’t need to know any specific routes so we can use a default route. We’ll use dynamic BGP peers so that we don’t have to configure static neighbors. Let’s start with the default route:

Why do we use BGP in the Wan?

First, because BGP in the WAN is infinitely scalable. Second, even though EIGRP is commonly used for DMVPN, it would mean supporting a third routing protocol (BGP for MPLS, OSPF for LAN, EIGRP for DMVPN), and that’s just nonsense. BGP also gives us expanded flexibility on how we can affect routing decisions in the WAN.

Can a DMVPN be used as a third routing protocol?

Second, even though EIGRP is commonly used for DMVPN, it would mean supporting a third routing protocol (BGP for MPLS, OSPF for LAN, EIGRP for DMVPN), and that’s just nonsense. BGP also gives us expanded flexibility on how we can affect routing decisions in the WAN.