[Kea-users] Planning some experimentation with HA using ECMP

[Dan Geist]

Hi. I have an environment where many of the network services (DNS, NTP, ToD, etc.) provide scaling, fault tolerance, and load sharing via ECMP (in front of the service) and BGP. Each (of the 2 or more) service node(s) monitors the status of that service and announces/pulls BGP announcements from the upstream router pair. This works really well for protocols with simple request/response transactions. 

I'd like to try doing this same thing with Kea dhcpv(4|6). In that setup, the same "virtual service IP" would be configured on each of several Kea nodes (in addition to the real link IPs) and they would announce these to the next hop (as above). My thinking is that if there is a common configuration and lease backend to these multiple nodes, then this can be a way to provide HA services (and scaling) to a very large number of devices. My only concern is how the multi-step transaction will be handled. 

Before I spend the time to mock this up, has anyone else tried ECMP load distribution with DHCP, specifically on Kea, and are there any "gotchas" to be aware of? 

Thanks. 
Dan 

-- 
Dan Geist dan(@)polter.net 
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