Hello there.
I operate a small personal IPv6-only network under my own AS, mainly for
learning purposes, with the core of it being compromised of four main hosts
spread around the world in a mesh topology. Each has a full IPv6 table, as I
connect to a variety of transit providers and IXs on different routers. I
obviously use BGP as my Exterior Routing Protocol, but use Babel as my Interior
Routing Protocol between the four hosts.
At the moment I am using Bird 2 to handle both BGP and Babel, and it barely
breaks a sweat, but would like to use babeld for the Babel component so to be
able to leverage some of the additional features that the Bird implementation
lacks.
I've ran in to an issue though where babeld hits the ceiling with CPU usage the
moment I start it and has some trouble maintaining reliable neighbor
connections. This does not subside.
Even if I disable the redistribution and installation of all routes using the
following configuration options, and have the rest as a stock standard minimal
configuration, I see this behavior remain:
local-port 33123
interface wg-1
interface wg-2
interface wg-3
redistribute local deny
install deny
My routers are low-end VPSs, most having 1GB of RAM, with around half of this,
and a single vCPU, and are all running Alpine Linux. In terms of IPv6 routes, a
quick check reveals that the kernel routing table is holding about ~150,000
routes, though only a handful of those are ones that I have babel managing
since it is only playing the role of an IGP.
Any clues what sort of limit I may have reached or how to mitigate this? Is the
CPU being eaten up constantly monitoring and filtering route changes in my
kernel routing table due to the constant churn of the global IPv6 table?
Any tips as to how I can further troubleshoot this would be very much
appreciated.
Thank you all, especially to Juliusz and all the other contributors to the
babel specifications and implementations.
Cheers,
Steven
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