RyuBGP doesn't work well regarding the advertisement of BGP MED Attribute as
follows.
(1) In spite of receiving BGP MED:"500" from iBGP(R2), RyuBGP can't advertise
BGP MED:"100" to eBGP(R3).
R1 -------------> R2 -------------> RyuBGP -------------> R3
eBGP(MED:500) iBGP(MED:500) ^ eBGP(MED:500)
(MED:100)
(2) When RyuBGP has received BGP MED:"200" from eBGP(R3), RyuBGP has sended BGP
with missing-MED to iBGP(R2).
As result, PolicyBaseRouting in R2(other RyuBGP) doesn't work properly
becase of selecting wrong BestPath.
eBGP(MED:100)
R1 ------------------------------------>+
|
R3 -------------> RyuBGP -------------> R2(RyuBGP) => Wrong result
[BestPath is "R3-R2"]
eBGP(MED:200) iBGP(MED:N/A)
Signed-off-by: Toshiki Tsuboi <[email protected]>
---
ryu/services/protocols/bgp/peer.py | 10 +++++++---
1 file changed, 7 insertions(+), 3 deletions(-)
diff --git a/ryu/services/protocols/bgp/peer.py
b/ryu/services/protocols/bgp/peer.py
index eac098c..48806bc 100644
--- a/ryu/services/protocols/bgp/peer.py
+++ b/ryu/services/protocols/bgp/peer.py
@@ -75,6 +75,7 @@ from ryu.lib.packet.bgp import
BGPPathAttributeExtendedCommunities
from ryu.lib.packet.bgp import BGPPathAttributeMpReachNLRI
from ryu.lib.packet.bgp import BGPPathAttributeMpUnreachNLRI
from ryu.lib.packet.bgp import BGPPathAttributeCommunities
+from ryu.lib.packet.bgp import BGPPathAttributeMultiExitDisc
from ryu.lib.packet.bgp import BGP_ATTR_TYPE_ORIGIN
from ryu.lib.packet.bgp import BGP_ATTR_TYPE_AS_PATH
@@ -940,12 +941,15 @@ class Peer(Source, Sink, NeighborConfListener, Activity):
# For eBGP session we can send multi-exit-disc if configured.
multi_exit_disc = None
if self.is_ebgp_peer():
- multi_exit_disc = pathattr_map.get(
- BGP_ATTR_TYPE_MULTI_EXIT_DISC)
- if not multi_exit_disc and self._neigh_conf.multi_exit_disc:
+ if self._neigh_conf.multi_exit_disc:
multi_exit_disc = BGPPathAttributeMultiExitDisc(
self._neigh_conf.multi_exit_disc
)
+ else:
+ pass
+ if not self.is_ebgp_peer():
+ multi_exit_disc = pathattr_map.get(
+ BGP_ATTR_TYPE_MULTI_EXIT_DISC)
# LOCAL_PREF Attribute.
if not self.is_ebgp_peer():
--
1.9.1
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