distributed_bridge: check ip address before validating traffic

Signed-off-by: Wei-Chun Chao <[email protected]>

examples/distributed_bridge/main.py

@@ -6,7 +6,7 @@
 from builtins import input
 from pyroute2 import IPRoute, NetNS, IPDB, NSPopen
 from simulation import Simulation
-from subprocess import PIPE, call
+from subprocess import PIPE, call, Popen
 
 if len(argv) > 1 and argv[1] == "mesh":
  multicast = 0
@@ -43,10 +43,13 @@ def start(self):
  print("Validating connectivity")
  for i in range(1, num_hosts):
  for j in range(0, 2):
- out = 1
- while out:
- out = call(["ip", "netns", "exec", "host%d" % i,
- "ip", "addr", "show", "br%d" % j], stdout=null, stderr=null)
+ retry = -1
+ while retry < 0:
+ check = Popen(["ip", "netns", "exec", "host%d" % i,
+ "ip", "addr", "show", "br%d" % j], stdout=PIPE, stderr=PIPE)
+ out = check.stdout.read()
+ checkip = "99.1.%d.%d" % (j, i+1)
+ retry = out.find(checkip)
  print("VNI%d between host0 and host%d" % (10000 + j, i))
  call(["ip", "netns", "exec", "host%d" % i,
  "ping", "99.1.%d.1" % j, "-c", "3", "-i", "0.2", "-q"])