The document describes an experiment using RyuBGPSpeaker to create a simple OpenFlow router that integrates BGP and OpenFlow routing. The author first tests connecting an OpenFlow switch to RyuBGPSpeaker to inject BGP learned prefixes into the switch's flow table. Then, the author improves the design by running the OpenFlow switch and Ryu controller on the same Linux machine to avoid adding cables for each new BGP peer. The experiment confirms basic routing works as expected, with routes converging again within a minute if the BGP network is interrupted.

1. RyuBGPSpeakerを
活用したOpenFlow簡易ルータ
を試してみた
2014.12.24
@ttsubo
1

2. RyuBGPSpeakerは、BGPによるダイナミック
ルーティングが動作可能だが、データプレーンは
未対応なので、実環境には適用できません。
OpenFlow簡易ルータを自作して、
BGP/OpenFlowと連携させてみた
2

3. First Step..
RouterBOARDをOpenFlow化させ、RyuBGPSpeakerで
学習したPrefixをFlow Tableに注入してみる。
internet
OpenFlow
スイッチ
Ryuコントローラ
BGP
Message
OpenFlow
Message
Quagga1 Quagga2
3

4. OpenflowRouter
RouterController
REST-IF
data
SimpleRouter
WSGI Application
Simple
BGPSpeaker
PortTable
ArpTable
RoutingTable
PortStats
FlowStats
SimpleMonitor
RyuApp
FlowTable OpenFlowスイッチ
（OpenvSwitch）
BGPルータ
（Quagga）
OpenFlow
Message
BGP
Message
OpenFlowチャネルBGPチャネル
NorthBound
4

5. 確かに、このBGPネットワーク構成で、
期待どおりに動作したのだが....
5

6. 192.168.200.1
OpenFlow
チャネル
192.168.201.1
Ryuコントローラ
192.168.200.100 192.168.201.100AS:65001
この構成の課題は、BGP Peer数が増えるごと
に、RyuコントローラとOpenFlowスイッチ間
のケーブル結線も増えてしまう。
AS:65002
AS:65002
（固定）
Port1 Port2
BGP
チャネル
....
6

7. LinuxBox上にOpenFlowスイッチとRyuコントローラを
同居させて、LinuxBox内部インターフェスで繋げてみる。
Second Step..
internet
192.168.100.1
Quagga1
Quagga3
Quagga2
OVS1
OVS2
OVS3
AS65001 AS65002
192.168.100.0/24 192.168.102.0/24
192.168.102.1
7

8. internet
192.168.100.1
Quagga1
Quagga3
Quagga2
OVS1
OVS2
OVS3
192.168.102.1
iBGP
eBGP
eBGP
iBGP
iBGP
iBGP
AS65001 AS65002
192.168.100.0/24
192.168.102.0/24
BGPルータ間でBGP経路伝搬させて…
BGPネットワーク面を経由してinternetに繋いでみる
8

9. internet
192.168.100.1
Quagga1
Quagga3
Quagga2
OVS1
OVS2
OVS3
192.168.102.1
iBGP
eBGP
iBGP
iBGP
iBGP
AS65001 AS65002
192.168.100.0/24
192.168.102.0/24
万一、BGPネットワーク面の途中区間で通信断が発生し
ても、適切に通信経路を 回させてみる
Down
9

10. 実際に、ネット通信が可能であり、途中区間で通信断が
発生しても、約１分程度で回復できた
10

11. Quagga
1
Quagga
2
OVS1
OVS2
AS65001
192.168.100.1/24
MED100
MED200
OVS3
Quagga
3
AS65002
root@Quagga-3:~#
ping
192.168.100.1
PING
192.168.100.1
(192.168.100.1):
56
data
bytes
64
bytes
from
192.168.100.1:
seq=0
ttl=254
time=1.999
ms
64
bytes
from
192.168.100.1:
seq=1
ttl=254
time=1.344
ms
64
bytes
from
192.168.100.1:
seq=2
ttl=254
time=1.272
ms
64
bytes
from
192.168.100.1:
seq=3
ttl=254
time=1.241
ms
64
bytes
from
192.168.100.1:
seq=4
ttl=254
time=1.217
ms
64
bytes
from
192.168.100.1:
seq=60
ttl=253
time=2.081
ms
64
bytes
from
192.168.100.1:
seq=61
ttl=253
time=1.414
ms
64
bytes
from
192.168.100.1:
seq=62
ttl=253
time=1.172
ms
64
bytes
from
192.168.100.1:
seq=63
ttl=253
time=1.364
ms
64
bytes
from
192.168.100.1:
seq=64
ttl=253
time=1.333
ms
64
bytes
from
192.168.100.1:
seq=65
ttl=253
time=1.323
ms
^C
---
192.168.100.1
ping
statistics
---
66
packets
transmitted,
11
packets
received,
83%
packet
loss
round-trip
min/avg/max
=
1.172/1.432/2.081
ms
192.168.101.1/24
Down
Pingも途中で通信断になったが、約１分後に回復できた
11

12. OpenFlow簡易ルータは、
Githubにて公開してます。
https://github.com/ttsubo/simpleRouter/tree/v0.3
12

13. 以下、参考
13

14. Quagga
1
Quagga
2
OVS1
OVS2
192.168.100.1/24
OVS3
Quagga
3
192.168.101.1/24
Status
codes:
*
valid,
>
best
Origin
codes:
i
-
IGP,
e
-
EGP,
?
-
incomplete
Network
Labels
Next
Hop
Reason
Metric
LocPrf
Path
*>
192.168.102.0/24
None
172.16.201.1
Only
Path
100
i
*>
172.16.103.0/24
None
192.168.201.1
Only
Path
100
65001
?
*>
172.16.102.0/24
None
192.168.201.1
Only
Path
100
65001
?
*>
192.168.202.0/24
None
192.168.201.1
Only
Path
100
65001
?
*>
192.168.100.0/24
None
192.168.201.1
Only
Path
100
65001
?
*>
0.0.0.0/0
None
192.168.201.1
Only
Path
100
65001
?
*>
10.0.0.2/32
None
192.168.201.1
Only
Path
100
65001
?
*>
172.16.201.101/32
None
172.16.201.1
Only
Path
100
i
*>
192.168.101.1/32
None
172.16.201.1
Only
Path
100
i
*>
172.16.202.101/32
None
172.16.201.1
Only
Path
100
i
*>
172.16.104.0/24
None
192.168.201.1
Only
Path
100
65001
?
*>
172.16.101.0/24
None
192.168.201.1
Only
Path
100
65001
?
*>
192.168.201.0/24
None
192.168.201.1
Only
Path
100
65001
?
*>
192.168.0.0/24
None
192.168.201.1
Only
Path
100
65001
?
*>
10.0.0.1/32
None
192.168.201.1
Only
Path
100
Show_rib_ipv4 in OVS1
192.168.201.0/24
192.168.202.0/24
172.16.203.0/24
172.16.201.0/24
172.16.202.0/24
14

15. http:/http http://www.nexcom-jp.com/FilData/getimg/5712caac-3256-4d8b-
b0ce-9c4ed262bed2://www.n http://www.nexcom-jp.com/FilData/getimg/
5712caac-3256-4d8b-b0ce-9c http://www.nexcom-jp.com/FilData/getimg/
5712caac-3256-4d8b-b0ce-9c4ed262bed2 4ed262bed2 excom-jp.com/FilData/
getimg/5712caac-3256-4d8b-b0ce-9c4ed262bed2/www.nexcom-jp.com/FilData/
getimg/5712caac-3256-4d8b-b0ce-9c4ed262bed2
Quagga
1
Quagga
2
OVS1
OVS2
192.168.100.1/24
OVS3
Quagga
3
192.168.101.1/24
Status
codes:
*
valid,
>
best
Origin
codes:
i
-
IGP,
e
-
EGP,
?
-
incomplete
Network
Labels
Next
Hop
Reason
Metric
LocPrf
Path
*
192.168.201.0/24
None
192.168.202.1
200
65001
?
*>
None
172.16.203.1
MED
100
200
65001
?
*
0.0.0.0/0
None
192.168.202.1
200
65001
?
*>
None
172.16.203.1
MED
100
200
65001
?
*
172.16.102.0/24
None
192.168.202.1
200
65001
?
*>
None
172.16.203.1
MED
100
200
65001
?
*
192.168.100.0/24
None
192.168.202.1
200
65001
?
*>
None
172.16.203.1
MED
100
200
65001
?
*
10.0.0.1/32
None
192.168.202.1
200
65001
?
*>
None
172.16.203.1
MED
100
200
65001
?
…(snip)
*>
192.168.102.0/24
None
172.16.202.1
Only
Path
100
i
*>
192.168.101.1/32
None
172.16.202.1
Only
Path
100
i
*>
172.16.202.101/32
None
172.16.202.1
Only
Path
100
i
*>
172.16.201.101/32
None
172.16.202.1
Only
Path
100
i
Show_rib_ipv4 in OVS2
192.168.201.0/24
192.168.202.0/24
172.16.203.0/24
172.16.201.0/24
172.16.202.0/24
15

16. Quagga
1
Quagga
2
OVS1
OVS2
192.168.100.1/24
OVS3
Quagga
3
192.168.101.1/24
Status
codes:
*
valid,
>
best
Origin
codes:
i
-
IGP,
e
-
EGP,
?
-
incomplete
Network
Labels
Next
Hop
Reason
Metric
LocPrf
Path
*>
192.168.0.0/24
None
172.16.201.101
Only
Path
100
300
65001
?
*>
172.16.202.101/32
None
0.0.0.0
Only
Path
i
*>
192.168.201.0/24
None
172.16.201.101
Only
Path
100
300
65001
?
*>
10.0.0.1/32
None
172.16.201.101
Only
Path
100
300
65001
?
*>
172.16.104.0/24
None
172.16.201.101
Only
Path
100
300
65001
?
*>
172.16.101.0/24
None
172.16.201.101
Only
Path
100
300
65001
?
*>
192.168.102.0/24
None
192.168.101.1
Only
Path
i
*>
172.16.201.101/32
None
0.0.0.0
Only
Path
i
*>
192.168.100.0/24
None
172.16.201.101
Only
Path
100
300
65001
?
*>
10.0.0.2/32
None
172.16.201.101
Only
Path
100
300
65001
?
*>
192.168.101.1/32
None
0.0.0.0
Only
Path
i
*>
192.168.202.0/24
None
172.16.201.101
Only
Path
100
300
65001
?
*>
172.16.103.0/24
None
172.16.201.101
Only
Path
100
300
65001
?
*>
172.16.102.0/24
None
172.16.201.101
Only
Path
100
300
65001
?
*>
0.0.0.0/0
None
172.16.201.101
Only
Path
100
300
65001
?
Show_rib_ipv4 in OVS3
192.168.201.0/24
192.168.202.0/24
172.16.203.0/24
172.16.201.0/24
172.16.202.0/24
16

17. Quagga
1
Quagga
2
OVS1
OVS2
192.168.100.1/24
OVS3
Quagga
3
192.168.101.1/24
Down
Show_rib_ipv4 in OVS1
Status
codes:
*
valid,
>
best
Origin
codes:
i
-
IGP,
e
-
EGP,
?
-
incomplete
Network
Labels
Next
Hop
Reason
Metric
LocPrf
Path
*>
192.168.102.0/24
None
172.16.201.1
Only
Path
100
i
*>
0.0.0.0/0
None
172.16.203.101
Only
Path
200
200
65001
?
*>
172.16.103.0/24
None
172.16.203.101
Only
Path
200
200
65001
?
*>
192.168.0.0/24
None
172.16.203.101
Only
Path
200
200
65001
?
*>
172.16.102.0/24
None
172.16.203.101
Only
Path
200
200
65001
?
*>
192.168.202.0/24
None
172.16.203.101
Only
Path
200
200
65001
?
*>
192.168.201.0/24
None
172.16.203.101
Only
Path
200
200
65001
?
*>
172.16.101.0/24
None
172.16.203.101
Only
Path
200
200
65001
?
*>
10.0.0.1/32
None
172.16.203.101
Only
Path
200
200
65001
?
*>
192.168.100.0/24
None
172.16.203.101
Only
Path
200
200
65001
?
*>
172.16.104.0/24
None
172.16.203.101
Only
Path
200
200
65001
?
*>
10.0.0.2/32
None
172.16.203.101
Only
Path
200
200
65001
?
*>
172.16.201.101/32
None
172.16.201.1
Only
Path
100
i
*>
192.168.101.1/32
None
172.16.201.1
Only
Path
100
i
*>
172.16.202.101/32
None
172.16.201.1
Only
Path
100
192.168.201.0/24
192.168.202.0/24
172.16.203.0/24
172.16.201.0/24
172.16.202.0/24
17

18. Quagga
1
Quagga
2
OVS1
OVS2
192.168.100.1/24
OVS3
Quagga
3
192.168.101.1/24
Down
Show_rib_ipv4 in OVS2
Status
codes:
*
valid,
>
best
Origin
codes:
i
-
IGP,
e
-
EGP,
?
-
incomplete
Network
Labels
Next
Hop
Reason
Metric
LocPrf
Path
*>
192.168.201.0/24
None
192.168.202.1
Only
Path
200
65001
?
*>
0.0.0.0/0
None
192.168.202.1
Only
Path
200
65001
?
*>
172.16.102.0/24
None
192.168.202.1
Only
Path
200
65001
?
*>
192.168.100.0/24
None
192.168.202.1
Only
Path
200
65001
?
*>
10.0.0.1/32
None
192.168.202.1
Only
Path
200
65001
?
*>
172.16.104.0/24
None
192.168.202.1
Only
Path
200
65001
?
*>
192.168.202.0/24
None
192.168.202.1
Only
Path
200
65001
?
*>
172.16.103.0/24
None
192.168.202.1
Only
Path
200
65001
?
*>
172.16.101.0/24
None
192.168.202.1
Only
Path
200
65001
?
*>
10.0.0.2/32
None
192.168.202.1
Only
Path
200
65001
?
*>
192.168.0.0/24
None
192.168.202.1
Only
Path
200
65001
?
*>
192.168.102.0/24
None
172.16.202.1
Only
Path
100
i
*>
192.168.101.1/32
None
172.16.202.1
Only
Path
100
i
*>
172.16.202.101/32
None
172.16.202.1
Only
Path
100
i
*>
172.16.201.101/32
None
172.16.202.1
Only
Path
100
i
192.168.201.0/24
192.168.202.0/24
172.16.203.0/24
172.16.201.0/24
172.16.202.0/24
18

19. Quagga
1
Quagga
2
OVS1
OVS2
192.168.100.1/24
OVS3
Quagga
3
192.168.101.1/24
Down
Show_rib_ipv4 in OVS3
Status
codes:
*
valid,
>
best
Origin
codes:
i
-
IGP,
e
-
EGP,
?
-
incomplete
Network
Labels
Next
Hop
Reason
Metric
LocPrf
Path
*>
192.168.100.0/24
None
172.16.202.101
Only
Path
200
100
65001
?
*>
172.16.202.101/32
None
0.0.0.0
Only
Path
i
*>
172.16.102.0/24
None
172.16.202.101
Only
Path
200
100
65001
?
*>
192.168.102.0/24
None
192.168.101.1
Only
Path
i
*>
172.16.201.101/32
None
0.0.0.0
Only
Path
i
*>
192.168.101.1/32
None
0.0.0.0
Only
Path
i
*>
0.0.0.0/0
None
172.16.202.101
Only
Path
200
100
65001
?
*>
172.16.101.0/24
None
172.16.202.101
Only
Path
200
100
65001
?
*>
192.168.201.0/24
None
172.16.202.101
Only
Path
200
100
65001
?
*>
192.168.0.0/24
None
172.16.202.101
Only
Path
200
100
65001
?
*>
172.16.104.0/24
None
172.16.202.101
Only
Path
200
100
65001
?
*>
10.0.0.1/32
None
172.16.202.101
Only
Path
200
100
65001
?
*>
10.0.0.2/32
None
172.16.202.101
Only
Path
200
100
65001
?
*>
172.16.103.0/24
None
172.16.202.101
Only
Path
200
100
65001
?
*>
192.168.202.0/24
None
172.16.202.101
Only
Path
200
100
65001
?
192.168.201.0/24
192.168.202.0/24
172.16.203.0/24
172.16.201.0/24
172.16.202.0/24
19