DMVPN Tunnels - Problems With Overlay Networks
5 important questions on DMVPN Tunnels - Problems With Overlay Networks
What are 2 frequently found problems with tunnel or overlay networks?
- Recursive routing
- Outbound interface selection
What causes Recursive Routing issues with tunnel or overlay networks?
- Happens when a route tries to reach an encapsulating interface (underlay network) of it's peer through the tunnel (overlay network)
- This often happens when the underlay/transport network is advertised in to the tunnel/overlay network.
What can cause issues with outbound interface selection to tunnel traffic?
- If a router has two ISP interfaces, both set to DHCP, it gets two default routes. In this case it can choose the wrong interface/isp to set up the tunnel.
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What is a VRF that is known as a Front Door VRF (FVRF)?
How can a Front Door VRF prevent common issues with tunnel/overlay networks?
- Because it is a logically seperated router it will have a seperate RIB and it won't advertise routes into the tunnel/overlay network RIB. Therefore preventin any form of Route Recursion.
- By using a Front Door VRF instance per ISP, the routes to the ISP are within their own Routing Tables.
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