[Babel-users] removal of old/stale routes from babel

[Christof Schulze]

>
>You're probably just seeing fallback routes.  (We'd need to see your dump
>to be sure.)
>
>Babel keeps a redundant routing table -- it keeps routes to every
>destination through every single neighbour.  This way, it can switch to
>a different route immediately when it detects that its current next-hop is
>down.
>
>If you have 10 neighbours and there are 60 routes in the network, you'll
>see 600 routes in your routing table.  Don't worry, though -- a fallback
>route is just a 60-byte data structure, so 600 routes take less than 40kB
>of memory.  (Fallback routes are not visible to the kernel, and are not
>announced over the network.)
>
>You can distinguish between redundant routes and the routes actually used
>by the "installed" flag -- a route that is marked as "installed" is
>currently used for traffic, a route that is marked as "feasible" is
>a fallback route that can be used straight away if necessary, a route that
>is not marked is an "unfeasible" route, one that cannot be used without
>doing a quick packet exchange to make sure that it is loop-free.
>
>My advice would be:
>
>  - don't panic, in large, friendly letters;
>  - only start worrying if babeld starts having a large RSS or uses more
>    than a fraction of CPU;
>  - use BabelWeb in order to better understand better what's going on in
>    your network:
>
>    https://github.com/Vivena/babelweb2
>
>Please don't hesitate to send me a route dump (through the list or, if
>you're concerned about your users' privacy, by private mail), I'd be
>curious to see what's going on.
>
>Thanks for the input,
I have sent a reply off-list containing routes and dump from babel. 
Unfortunately in my tiny network a 3 digit number of routes is actually 
installed.

viele Grüße

Christof

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