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diff --git a/scapy/contrib/mpls.py b/scapy/contrib/mpls.py
index 640a0c5..6af1d4a 100644
--- a/scapy/contrib/mpls.py
+++ b/scapy/contrib/mpls.py
@@ -18,6 +18,8 @@ class MPLS(Packet):
def guess_payload_class(self, payload):
if len(payload) >= 1:
+ if not self.s:
+ return MPLS
ip_version = (ord(payload[0]) >> 4) & 0xF
if ip_version == 4:
return IP
@@ -27,3 +29,4 @@ class MPLS(Packet):
bind_layers(Ether, MPLS, type=0x8847)
bind_layers(GRE, MPLS, proto=0x8847)
+bind_layers(MPLS, MPLS, s=0)
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