[PATCH] More multipath support for OSPF
pch at ordbogen.com
Thu Feb 6 14:17:12 CET 2014
I noticed that the multipath support in OSPF seems to be fairly limited.
Essentially I was only able to make it do multipath if I had two
interfaces connecting to the same router.
At my company, we need true multipath between multiple routers using a
single interface. (If I needed the other, I could use LACP)
I am aware of the implications the default multipath implementation in
Linux which operates on a per-packet basis, which is why we've patched
our kernels to do it per-flow instead.
Anyway, I seemed to have managed to make multipath work as expected - at
least in our setup. (Patch attached)
Essentially, I've hooked my multipath code into ri_install_ext() and
ri_install_net(), where I add the equal routes if the routes share the
same type, metrics and OSPF area.
I realize that my add_nexthops() is /very/ similar to merge_nexthops()
in functionality, but it seemed that the top_hash_entry() could be null,
so I wrote a new method which did not rely on that - at the cost of more
calls to copy_nexthop(), I guess.
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