[pox-dev] Host Unreachable in a loop topo

[Sadia Bashir]

Hi everyone, I have four switches connected in a loop, each switch has two
hosts connected with it. My requirement is to maintain flow in one
direction only i.e., echo request and echo reply after issuing a ping
command should take different routes. If I want to ping h3(connected to s2)
from h1(connected to s1), destination(h3 @ s2) is unreachable, In this case
controller should tell s1 to forward packet to port connected to s2. My
question is how would controller know which s1 port is connected to s2 and
if I broadcast the packet it remains in a loop and never reaches at its
destination. Thank you!

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