Alia Atlas wrote:
I am interested to learn what people think about whether equal-cost
multi-path routes are needed in homenet. Given the previous
discussion about parallel wireless links - which I know I have in my
house and can't use - I've been wondering if these have been considered.
ECMP is critical in the data-center and backbone, but I'm interested
in seeing what the reasoning is as to why it isn't or is needed in the
homenet scenarios.
Thanks,
Alia
P.S. I do expect that any routing protocol can be made to do ECMP, of
course.
I was surprised ECMP did NOT work when I tested the latest homenet code.
All the elements are capable of doing it, but it wasn't implemented.
One reason IMHO that it's potentially useful (but not essential) is that
(most) plastic homenet routers include a L2 switch in front of the L3
interface(s). Therefore the L2 interface doesn't actually physically go
down when cables are unplugged/ links are unstable. Without ECMP you get
many seconds of complete black holing whilst the router figures out at
L3 (RP hellos or HNCP) that the interface is actually down and the
neighbour has gone away. With ECMP you just get bad packet loss if load
balancing is per packet.
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