Reported-by: Toshiki Tsuboi <[email protected]>
Signed-off-by: ISHIDA Wataru <[email protected]>
---
ryu/lib/packet/bgp.py | 9 +++++++++
1 file changed, 9 insertions(+)
diff --git a/ryu/lib/packet/bgp.py b/ryu/lib/packet/bgp.py
index b5d85d2..bd3304f 100644
--- a/ryu/lib/packet/bgp.py
+++ b/ryu/lib/packet/bgp.py
@@ -772,6 +772,13 @@ class _BinAddrPrefix(_AddrPrefix):
class _LabelledAddrPrefix(_AddrPrefix):
_LABEL_PACK_STR = '!3B'
+ # RFC3107
+ # 3. Carrying Label Mapping Information
+ # The label information carried (as part of NLRI) in the Withdrawn
+ # Routes field should be set to 0x800000. (Of course, terminating the
+ # BGP session also withdraws all the previously advertised routes.)
+ #
+ _WITHDRAW_LABEL = 0x800000
def __init__(self, length, addr, labels=[], **kwargs):
assert isinstance(labels, list)
@@ -843,6 +850,8 @@ class _LabelledAddrPrefix(_AddrPrefix):
while True:
(label, rest) = cls._label_from_bin(rest)
+ if label == cls._WITHDRAW_LABEL:
+ break
labels.append(label >> 4)
if label & 1: # bottom of stack
break
--
1.9.1
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