abcd@test.ex
    <-- t1@d1
  router = r3, transport = t1
abcd@d1
    <-- t1@d1
  router = r3, transport = t1
\abcd@test.ex
    <-- t1@d1
  router = r3, transport = t1
spqr@d2
    <-- alias1@d2
  router = r3, transport = t1
spqr@test.ex
    <-- alias2@d2
  router = r3, transport = t1