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redundant VPN connections over Expressroute private peering

tr flag

I have configured redundant VPN connections over expressroute private peering with private IPs. BGP is configured making router 2 backup using BGP as-path. Wondering how the traffic is sent back to on-prem routers there is active-passive configuration but it seems there is packet loss from Azure to on-prem. Effective routes on a nic in a VNet shows VPN-GW public IP as next hop. How is traffic forwarded to next-hop from there? Fear it is only ECMP? Attaching topology. enter image description here @kapilananth-MSFT

cn flag
`packet loss from Azure to on-prem`. What throughput are we talking about?
MatB avatar
tr flag
There are just a few kbs sent on the backup tunnel from Azure side which are enough to cause problems. I have tested that this happens when LNG1 and LNG2 have same on-prem address space. I have tried to make LNG2 Address space more bigger so that LNG1 is preferred, but in that case failover does not work at all.
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