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Phase 2 and 3 DMVPN | DMVPN Tunnels Part 2
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Phase 2 and 3 DMVPN | DMVPN Tunnels Part 2
We’ve converted our static GRE tunnels to a shiny new Phase-1 DMVPN. But we’ve found some drawbacks… All traffic is flowing through the hub, which increases its load dramatically, consumes bandwidth, and adds latency.
We don’t want to be restricted in this way, so it’s time to investigate Phase-2. This allows us to use NHRP Resolution Request and Response messages to build spoke to spoke tunnels. This is a simple spoke configuration, where static GRE tunnels are converted to dynamic multipoint GRE (mGRE) tunnels. We’ll even see this configured in a lab.
But even phase-2 has its limitations. We can’t have a default route or summary route pointing to the hub any more. Spoke routers need to maintain large routing tables of their own. Fortunately we have Phase-3!
Phase-3 adds NHRP Redirect messages on the hub, and shortcut or override routes on the spoke. Now we can have spoke to spoke communication, as well as efficient routing tables!
In the next videos, we’re looking at routing over DMVPN, and advanced concepts like multi-hub, and hierarchical deployments
Overview of this video:
0:00 Introduction
0:21 Limitations of Phase-1
2:01 Phase-2
4:33 Live Configuration
6:41 Limitations of Phase-2
8:18 Phase-3
10:31 Live Configuration
LET'S CONNECT
We’ve converted our static GRE tunnels to a shiny new Phase-1 DMVPN. But we’ve found some drawbacks… All traffic is flowing through the hub, which increases its load dramatically, consumes bandwidth, and adds latency.
We don’t want to be restricted in this way, so it’s time to investigate Phase-2. This allows us to use NHRP Resolution Request and Response messages to build spoke to spoke tunnels. This is a simple spoke configuration, where static GRE tunnels are converted to dynamic multipoint GRE (mGRE) tunnels. We’ll even see this configured in a lab.
But even phase-2 has its limitations. We can’t have a default route or summary route pointing to the hub any more. Spoke routers need to maintain large routing tables of their own. Fortunately we have Phase-3!
Phase-3 adds NHRP Redirect messages on the hub, and shortcut or override routes on the spoke. Now we can have spoke to spoke communication, as well as efficient routing tables!
In the next videos, we’re looking at routing over DMVPN, and advanced concepts like multi-hub, and hierarchical deployments
Overview of this video:
0:00 Introduction
0:21 Limitations of Phase-1
2:01 Phase-2
4:33 Live Configuration
6:41 Limitations of Phase-2
8:18 Phase-3
10:31 Live Configuration
LET'S CONNECT
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