With a DMVPN setup, we have dual ISP, each connected to a single HUB at the main datacenter. If the main site goes dark, all the existing tunnels will stay up, but we want to be able to bring up new Spoke to Spoke tunnels when the main site is down.
I’ve looked around, and I can’t seem to find any design documents on how to make the main HUB site redundant – indeed all the dual hub designs I’ve seen not only put the pair of hubs on the same site, they put them on the same subnet. Now there’s nothing saying that they have to be on the same subnet, but conversely, there’s nothing saying that they can be on different subnets, yet alone different sites.
Can we have a pair of hubs – one for the MPLS cloud and one for Internet cloud on 3 different sites?
Yes you can.
We use dmvpn with NHRP. We have a central Router at wanhub1, and a second central router at wanhub2. The 2x routers point to each other for NHRP(ip nhrp nhs x.x.x.x), The remote office uses nhrp maps to connect to each wan hub site.
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