Hi all,
I've question regarding overlap route in AutoVPN.
Recently i read this documentation : https://documentation.meraki.com/MX/Networks_and_Routing/MX_Routing_Behavior#DC-DC_Failover
Let's assume all those DC is Hub with NAT Mode.
1.Based on statement in that documentation, is it true that if DC 2 is down/unreachable by Branch MX, route failover to DC 1 will not happen for 10.1.0.0/16 ?
If so, i seems can't quite understand why that's the case.
I'm assuming once DC 2 is down, route for 10.1.0.0/16 will be deleted in AutoVPN, is this correct ?
2. Is there any other solution so 10.1.0.0/16 can failover to DC 1 ?
Any answer is appreciated, thank you.
Solved! Go to solution.
If you really do have two DCs with the same subnet, then those DCs are probably using layer 2 extension across the sites. If they have that, then use the two MXs in warm spare mode. They will then as a single unit, and which ever is up will get the traffic and route it appropriately.
Otherwise if you really want to run active/active, connect each MX to your layer 3 core using a stub network (I quite like /29's these days). Then use BGP between your core switch and the MX and dynamically advertise routes into the MX and AutoVPN. Then if a DC does die, the routes stopped getting advertised via BGP, and everything fails over nicely.
If you really do have two DCs with the same subnet, then those DCs are probably using layer 2 extension across the sites. If they have that, then use the two MXs in warm spare mode. They will then as a single unit, and which ever is up will get the traffic and route it appropriately.
Otherwise if you really want to run active/active, connect each MX to your layer 3 core using a stub network (I quite like /29's these days). Then use BGP between your core switch and the MX and dynamically advertise routes into the MX and AutoVPN. Then if a DC does die, the routes stopped getting advertised via BGP, and everything fails over nicely.
You have a point here. Why would it not failover. When the spoke loses connectivity to the hub it also removes its routes..?