Ignore unexpected ICMPv6 Neighbor Discovery - Neighbor Solicitation packets

We need to adapt all functional traffic scripts related to functional
IPv6 tests to ingore receiving of unexpected ICMPv6ND_NS
(ICMPv6 Neighbor Discovery - Neighbor Solicitation) packets that are
sent automatically and we cannot avoid to receive them.

The reason is to prevent false negative test results in case of csit
functional tests that could block creation of new operational branch
(csit weekly jobs), usage of new vpp builds (csit semiweekly jobs)
and merging patches - csit as well as vpp.

Change-Id: I43c90e7c766762fa769a81661338759a11b401a1
Signed-off-by: Jan Gelety <jgelety@cisco.com>

1 files changed, 6 insertions, 1 deletions

diff --git a/resources/traffic_scripts/ipfix_sessions.py b/resources/traffic_scripts/ipfix_sessions.py
index e7597a894a..11e77fa08c 100755
--- a/resources/traffic_scripts/ipfix_sessions.py
+++ b/resources/traffic_scripts/ipfix_sessions.py
@@ -192,6 +192,11 @@ def main():
         pkt = rxq.recv(5)
         if pkt is None:
             raise RuntimeError("RX timeout")
+
+        if pkt.haslayer("ICMPv6ND_NS"):
+            # read another packet in the queue if the current one is ICMPv6ND_NS
+            continue
+
         if pkt.haslayer("IPFIXHeader"):
             if pkt.haslayer("IPFIXTemplate"):
                 # create or update template for IPFIX data packets
@@ -219,6 +224,6 @@ def main():
             raise RuntimeError("Received non-IPFIX packet or IPFIX header was"
                                "not recognized.")
 
-if __name__ == "__main__":
 
+if __name__ == "__main__":
     main()