InterAS MPLS-VPNにおけるボーダールータとして、Ryu SDN FrameworkにおけるBGP機能を配備した場合の動作を試してみました

1. Inter-AS環境におけるボーダールータとして
Ryu BGP機能を試してみた
2014.8.31
@ttsubo
1

2. 試してみたいこと
Ryu BGPを使ったポリシールーティングが
どの程度、動作するのか？
これまでの経緯は、
こちらのブログ記事を参考にしてください
http://ttsubo.hatenablog.com/entry/2014/08/16/000248
2

3. まずは、実際のCiscoルータの挙動を確認してみました
GNS3によるCisco
エミュレータですけど
3

4. ■まずは、目標感
-> InterAS MPLS VPNでのポリシールーティングの動作確認
通常時は、AS間のトラフィックを片側リンクに寄せたい
AS間での故障時は、もう片側のリンクに迂回させたい
PE1 P1
PE2
P2
ASBR3
CE4
CE3
CE1
CE2
RR
AS 65010(既設)
AS 65001
AS 65002
ASBR4
PE3
ASBR1
ASBR2
AS 65011(増設) CE5
LocalPreference
で制御
MED
で制御
LocalPreference
で制御
4 ポリシールーティング実現方法

5. ■検証構成
-> InterAS MPLS VPNにおける各BGPルータでのBGPテーブルを
確認してみる
eBGP
eBGP
Static経路
Static経路
Static経路
PE1 P1
PE2
P2
ASBR3
CE4
CE3
CE1
CE2
RR
AS 65010(既設)
AS 65001
AS 65002
ASBR4
PE3
ASBR1
ASBR2
AS 65011(増設) CE5
5

6. PE1#show bgp vpnv4 unicast all
BGP table version is 34, local router ID is 10.0.0.1
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,
r RIB-failure, S Stale, m multipath, b backup-path, f RT-Filter,
x best-external, a additional-path, c RIB-compressed,
PE1 P1
PE2
P2
ASBR3
CE4
CE3
CE1
CE2
RR
AS 65010(既設)
AS 65001
AS 65002
ASBR4
PE3
ASBR1
ASBR2
AS 65011(増設) CE5
Origin codes: i - IGP, e - EGP, ? - incomplete
RPKI validation codes: V valid, I invalid, N Not found
!
Network Next Hop Metric LocPrf Weight Path
Route Distinguisher: 65010:101 (default for vrf customerA)
*> 10.10.10.1/32 192.168.1.1 0 0 65001 ?
*>i 10.10.10.2/32 10.0.0.4 0 100 0 65002 ?
*>i 10.10.10.3/32 10.0.0.3 100 200 0 65011 ?
*>i 10.10.10.4/32 10.0.0.3 100 200 0 65011 ?
*>i 10.10.10.5/32 10.0.0.3 100 200 0 65011 ?
* 192.168.1.0/30 192.168.1.1 0 0 65001 ?
*> 0.0.0.0 0 32768 ?
*>i 192.168.2.0/30 10.0.0.4 0 100 0 ?
*>i 192.168.3.0/30 10.0.0.3 100 200 0 65011 ?
*>i 192.168.4.0/30 10.0.0.3 100 200 0 65011 ?
*>i 192.168.5.0/30 10.0.0.3 100 200 0 65011 ?
*> 192.168.201.0 192.168.1.1 0 0 65001 i
*>i 192.168.202.0 10.0.0.4 0 100 0 65002 i
*>i 192.168.203.0 10.0.0.3 100 200 0 65011 ?
*>i 192.168.204.0 10.0.0.3 100 200 0 65011 ?
*>i 192.168.205.0 10.0.0.3 100 200 0 65011 ?
PE1#
6

7. ASBR3#show bgp vpnv4 unicast all
BGP table version is 22, local router ID is 10.0.0.3
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,
Origin codes: i - IGP, e - EGP, ? - incomplete
RPKI validation codes: V valid, I invalid, N Not found
!
Network Next Hop Metric LocPrf Weight Path
Route Distinguisher: 65010:101
*>i 10.10.10.1/32 10.0.0.1 0 100 0 65001 ?
*>i 10.10.10.2/32 10.0.0.4 0 100 0 65002 ?
*> 10.10.10.3/32 192.168.101.102 100 200 0 65011 ?
*> 10.10.10.4/32 192.168.101.102 100 200 0 65011 ?
*> 10.10.10.5/32 192.168.101.102 100 200 0 65011 ?
*>i 192.168.1.0/30 10.0.0.1 0 100 0 ?
*>i 192.168.2.0/30 10.0.0.4 0 100 0 ?
*> 192.168.3.0/30 192.168.101.102 100 200 0 65011 ?
*> 192.168.4.0/30 192.168.101.102 100 200 0 65011 ?
*> 192.168.5.0/30 192.168.101.102 100 200 0 65011 ?
*>i 192.168.201.0 10.0.0.1 0 100 0 65001 i
*>i 192.168.202.0 10.0.0.4 0 100 0 65002 i
*> 192.168.203.0 192.168.101.102 100 200 0 65011 ?
*> 192.168.204.0 192.168.101.102 100 200 0 65011 ?
*> 192.168.205.0 192.168.101.102 100 200 0 65011 ?
ASBR3#
PE1 P1
PE2
P2
r RIB-failure, S Stale, m multipath, b backup-path, f RT-Filter,
x best-external, a additional-path, c RIB-compressed,
ASBR3
CE4
CE3
CE1
CE2
RR
AS 65010(既設)
AS 65001
AS 65002
ASBR4
PE3
ASBR1
ASBR2
AS 65011(増設) CE5
7

8. ASBR1#show bgp vpnv4 unicast all
BGP table version is 34, local router ID is 10.0.1.1
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,
Origin codes: i - IGP, e - EGP, ? - incomplete
RPKI validation codes: V valid, I invalid, N Not found
!
Network Next Hop Metric LocPrf Weight Path
Route Distinguisher: 65010:101 (default for vrf customerA)
*> 10.10.10.1/32 192.168.101.101 100 200 0 65010 65001 ?
*> 10.10.10.2/32 192.168.101.101 100 200 0 65010 65002 ?
*>i 10.10.10.3/32 10.0.1.3 0 100 0 ?
*> 10.10.10.4/32 192.168.4.2 0 32768 ?
*>i 10.10.10.5/32 10.0.1.2 0 100 0 ?
*> 192.168.1.0/30 192.168.101.101 100 200 0 65010 ?
*> 192.168.2.0/30 192.168.101.101 100 200 0 65010 ?
*>i 192.168.3.0/30 10.0.1.3 0 100 0 ?
*> 192.168.4.0/30 0.0.0.0 0 32768 ?
*>i 192.168.5.0/30 10.0.1.2 0 100 0 ?
*> 192.168.201.0 192.168.101.101 100 200 0 65010 65001 i
*> 192.168.202.0 192.168.101.101 100 200 0 65010 65002 i
*>i 192.168.203.0 10.0.1.3 0 100 0 ?
*> 192.168.204.0 192.168.4.2 0 32768 ?
*>i 192.168.205.0 10.0.1.2 0 100 0 ?
ASBR1#
PE1 P1
PE2
P2
r RIB-failure, S Stale, m multipath, b backup-path, f RT-Filter,
x best-external, a additional-path, c RIB-compressed,
ASBR3
CE4
CE3
CE1
CE2
RR
AS 65010(既設)
AS 65001
AS 65002
ASBR4
PE3
ASBR1
ASBR2
AS 65011(増設) CE5
8

9. ASBR2#show bgp vpnv4 unicast all
BGP table version is 34, local router ID is 10.0.1.2
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,
Origin codes: i - IGP, e - EGP, ? - incomplete
RPKI validation codes: V valid, I invalid, N Not found
!
Network Next Hop Metric LocPrf Weight Path
Route Distinguisher: 65010:101 (default for vrf customerA)
*>i 10.10.10.1/32 10.0.1.1 100 200 0 65010 65001 ?
* 192.168.102.101 200 100 0 65010 65001 ?
*>i 10.10.10.2/32 10.0.1.1 100 200 0 65010 65002 ?
* 192.168.102.101 200 100 0 65010 65002 ?
*>i 10.10.10.3/32 10.0.1.3 0 100 0 ?
*>i 10.10.10.4/32 10.0.1.1 0 100 0 ?
*> 10.10.10.5/32 192.168.5.2 0 32768 ?
*>i 192.168.1.0/30 10.0.1.1 100 200 0 65010 ?
* 192.168.102.101 200 100 0 65010 ?
*>i 192.168.2.0/30 10.0.1.1 100 200 0 65010 ?
* 192.168.102.101 200 100 0 65010 ?
*>i 192.168.3.0/30 10.0.1.3 0 100 0 ?
*>i 192.168.4.0/30 10.0.1.1 0 100 0 ?
*> 192.168.5.0/30 0.0.0.0 0 32768 ?
*>i 192.168.201.0 10.0.1.1 100 200 0 65010 65001 i
* 192.168.102.101 200 100 0 65010 65001 i
*>i 192.168.202.0 10.0.1.1 100 200 0 65010 65002 i
* 192.168.102.101 200 100 0 65010 65002 i
*>i 192.168.203.0 10.0.1.3 0 100 0 ?
*>i 192.168.204.0 10.0.1.1 0 100 0 ?
*> 192.168.205.0 192.168.5.2 0 32768 ?
ASBR2#
PE1 P1
PE2
P2
r RIB-failure, S Stale, m multipath, b backup-path, f RT-Filter,
x best-external, a additional-path, c RIB-compressed,
ASBR3
CE4
CE3
CE1
CE2
RR
AS 65010(既設)
AS 65001
AS 65002
ASBR4
PE3
ASBR1
ASBR2
AS 65011(増設) CE5
9

10. PE3#show bgp vpnv4 unicast all
BGP table version is 34, local router ID is 10.0.1.3
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,
r RIB-failure, S Stale, m multipath, b backup-path, f RT-Filter,
x best-external, a additional-path, c RIB-compressed,
Origin codes: i - IGP, e - EGP, ? - incomplete
RPKI validation codes: V valid, I invalid, N Not found
!
Network Next Hop Metric LocPrf Weight Path
Route Distinguisher: 65010:101 (default for vrf customerA)
*>i 10.10.10.1/32 10.0.1.1 100 200 0 65010 65001 ?
*>i 10.10.10.2/32 10.0.1.1 100 200 0 65010 65002 ?
*> 10.10.10.3/32 192.168.3.2 0 32768 ?
*>i 10.10.10.4/32 10.0.1.1 0 100 0 ?
*>i 10.10.10.5/32 10.0.1.2 0 100 0 ?
*>i 192.168.1.0/30 10.0.1.1 100 200 0 65010 ?
*>i 192.168.2.0/30 10.0.1.1 100 200 0 65010 ?
*> 192.168.3.0/30 0.0.0.0 0 32768 ?
*>i 192.168.4.0/30 10.0.1.1 0 100 0 ?
*>i 192.168.5.0/30 10.0.1.2 0 100 0 ?
*>i 192.168.201.0 10.0.1.1 100 200 0 65010 65001 i
*>i 192.168.202.0 10.0.1.1 100 200 0 65010 65002 i
*> 192.168.203.0 192.168.3.2 0 32768 ?
*>i 192.168.204.0 10.0.1.1 0 100 0 ?
*>i 192.168.205.0 10.0.1.2 0 100 0 ?
PE3#
PE1 P1
PE2
P2
ASBR3
CE4
CE3
CE1
CE2
RR
AS 65010(既設)
AS 65001
AS 65002
ASBR4
PE3
ASBR1
ASBR2
AS 65011(増設) CE5
10

11. つぎに、ASBRにRyuBGPを適用した場合、
BGPの挙動を確認してみました
11

12. ■Ryu BGPを適用した検証構成
-> AS:65011のボーダールータとしてRyu BGPを配意してみる。
通常時は、AS間のトラフィックを片側リンクに寄せたい
AS間での故障時は、もう片側のリンクに迂回させたい
PE1 P1
PE2
P2
ASBR3
CE4
CE3
CE1
CE2
RR
AS 65010(既設)
AS 65001
AS 65002
ASBR4
PE3
Ryu BGP1
Ryu BGP2
AS 65011(増設) CE5
MED
で制御
LocalPreference
で制御
LocalPreference
で制御
ポリシールーティング実現方法
12

13. Ryu BGP1のサンプルコード
import eventlet
import time
!
eventlet.monkey_patch()
!
import logging
import sys
logging.basicConfig(level=logging.INFO)
!
from ryu.services.protocols.bgp.bgpspeaker import BGPSpeaker
!
def dump_remote_best_path_change(event):
print 'the best path changed:', event.remote_as, event.prefix,
event.nexthop, event.is_withdraw
!
if __name__ == "__main__":
speaker = BGPSpeaker(as_number=65011, router_id='10.0.1.1',
best_path_change_handler=dump_remote_best_path_change, ssh_console=True,
label_range=(1000,1999))
!
speaker.neighbor_add('192.168.101.101', 65010, enable_ipv4=True, enable_vpnv4=True,
multi_exit_disc=100)
speaker.neighbor_add('192.168.104.102', 65011, enable_ipv4=True, enable_vpnv4=True,
next_hop='10.0.1.1')
speaker.neighbor_add('10.0.1.3', 65011, enable_ipv4=True, enable_vpnv4=True, next_hop='10.0.1.1')
speaker.vrf_add('65010:101', ['65010:101'], ['65010:101'])
eventlet.sleep(5)
speaker.prefix_add('192.168.4.0/30', next_hop='0.0.0.0', route_dist='65010:101')
speaker.prefix_add('10.10.10.4/32', next_hop='192.168.4.2', route_dist='65010:101')
speaker.prefix_add('192.168.204.0/30', next_hop='192.168.4.2', route_dist='65010:101')
!
while True:
eventlet.sleep(5)
13

14. Ryu BGP2のサンプルコード
import eventlet
import time
!
eventlet.monkey_patch()
!
import logging
import sys
logging.basicConfig(level=logging.INFO)
!
from ryu.services.protocols.bgp.bgpspeaker import BGPSpeaker
!
def dump_remote_best_path_change(event):
print 'the best path changed:', event.remote_as, event.prefix,
event.nexthop, event.is_withdraw
!
if __name__ == "__main__":
speaker = BGPSpeaker(as_number=65011, router_id='10.0.1.2',
best_path_change_handler=dump_remote_best_path_change, ssh_console=True,
label_range=(2000,2999))
!
speaker.neighbor_add('192.168.102.101', 65010, enable_ipv4=True, enable_vpnv4=True,
multi_exit_disc=200)
speaker.neighbor_add('192.168.104.101', 65011, enable_ipv4=True, enable_vpnv4=True,
next_hop='10.0.1.2')
speaker.neighbor_add('10.0.1.3', 65011, enable_ipv4=True, enable_vpnv4=True, next_hop='10.0.1.2')
speaker.vrf_add('65010:101', ['65010:101'], ['65010:101'])
eventlet.sleep(5)
speaker.prefix_add('192.168.5.0/30', next_hop='0.0.0.0', route_dist='65010:101')
speaker.prefix_add('10.10.10.5/32', next_hop='192.168.5.2', route_dist='65010:101')
speaker.prefix_add('192.168.205.0/30', next_hop='192.168.5.2', route_dist='65010:101')
!
while True:
eventlet.sleep(5)
14

15. ■BGP経路構成（Ryu BGP起動後）
eBGP
eBGP
Ryu BGP1
Ryu BGP２
Static経路
Static経路
Static経路
PE1 P1
PE2
P2
ASBR3
CE4
CE3
CE1
CE2
RR
AS 65010(既設)
AS 65001
AS 65002
ASBR4
Ryu BGP1
Ryu BGP2
PE3
15 AS 65011(増設) CE5

16. PE1#show bgp vpnv4 unicast all
BGP table version is 466, local router ID is 10.0.0.1
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,
r RIB-failure, S Stale, m multipath, b backup-path, f RT-Filter,
x best-external, a additional-path, c RIB-compressed,
PE1 P1
PE2
P2
ASBR3
CE4
CE3
CE1
CE2
RR
AS 65010(既設)
AS 65001
AS 65002
ASBR4
PE3
Ryu BGP1
Ryu BGP2
AS 65011(増設) CE5
Origin codes: i - IGP, e - EGP, ? - incomplete
RPKI validation codes: V valid, I invalid, N Not found
!
Network Next Hop Metric LocPrf Weight Path
Route Distinguisher: 65010:101 (default for vrf customerA)
*> 10.10.10.1/32 192.168.1.1 0 0 65001 ?
*>i 10.10.10.2/32 10.0.0.4 0 100 0 65002 ?
*>i 10.10.10.3/32 10.0.0.3 0 200 0 65011 ?
*>i 10.10.10.4/32 10.0.0.3 100 200 0 65011 ?
*>i 10.10.10.5/32 10.0.0.3 100 200 0 65011 ?
* 192.168.1.0/30 192.168.1.1 0 0 65001 ?
*> 0.0.0.0 0 32768 ?
*>i 192.168.2.0/30 10.0.0.4 0 100 0 ?
*>i 192.168.3.0/30 10.0.0.3 0 200 0 65011 ?
*>i 192.168.4.0/30 10.0.0.3 100 200 0 65011 ?
*>i 192.168.5.0/30 10.0.0.3 100 200 0 65011 ?
*> 192.168.201.0 192.168.1.1 0 0 65001 i
*>i 192.168.202.0 10.0.0.4 0 100 0 65002 i
*>i 192.168.203.0 10.0.0.3 0 200 0 65011 ?
*>i 192.168.204.0/30 10.0.0.3 100 200 0 65011 ?
*>i 192.168.205.0/30 10.0.0.3 100 200 0 65011 ?
PE1#
PE3で生成した経路情報
に限り、MED値が表示さ
れない
16

17. ASBR3#sh bgp vpnv4 unicast all
BGP table version is 331, local router ID is 10.0.0.3
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,
r RIB-failure, S Stale, m multipath, b backup-path, f RT-Filter,
x best-external, a additional-path, c RIB-compressed,
PE1 P1
PE2
P2
ASBR3
PE3で生成した経路情報
に限り、MED値が表示さ
れない
CE4
CE3
CE1
CE2
RR
AS 65010(既設)
AS 65001
AS 65002
ASBR4
PE3
AS 65011(増設) CE5
Origin codes: i - IGP, e - EGP, ? - incomplete
RPKI validation codes: V valid, I invalid, N Not found
!
Network Next Hop Metric LocPrf Weight Path
Route Distinguisher: 65010:101
*>i 10.10.10.1/32 10.0.0.1 0 100 0 65001 ?
*>i 10.10.10.2/32 10.0.0.4 0 100 0 65002 ?
*> 10.10.10.3/32 192.168.101.102 0 200 0 65011 ?
*> 10.10.10.4/32 192.168.101.102 100 200 0 65011 ?
*> 10.10.10.5/32 192.168.101.102 100 200 0 65011 ?
*>i 192.168.1.0/30 10.0.0.1 0 100 0 ?
*>i 192.168.2.0/30 10.0.0.4 0 100 0 ?
*> 192.168.3.0/30 192.168.101.102 0 200 0 65011 ?
*> 192.168.4.0/30 192.168.101.102 100 200 0 65011 ?
*> 192.168.5.0/30 192.168.101.102 100 200 0 65011 ?
*>i 192.168.201.0 10.0.0.1 0 100 0 65001 i
*>i 192.168.202.0 10.0.0.4 0 100 0 65002 i
*> 192.168.203.0 192.168.101.102 0 200 0 65011 ?
*> 192.168.204.0/30 192.168.101.102 100 200 0 65011 ?
*> 192.168.205.0/30 192.168.101.102 100 200 0 65011 ?
ASBR3#
Ryu BGP1
Ryu BGP2
17

18. PE1 P1
PE2
P2
ASBR3
CE4
CE3
CE1
CE2
RR
AS 65010(既設)
AS 65001
AS 65002
ASBR4
PE3
AS 65011(増設) CE5
bgpd> show rib vpnv4
Status codes: * valid, > best
Origin codes: i - IGP, e - EGP, ? - incomplete
Network Labels Next Hop Reason Metric LocPrf Path
*> 65010:101:192.168.5.0/30 [2000] 10.0.1.2 Only Path 100 ?
*> 65010:101:10.10.10.5/32 [2001] 10.0.1.2 Only Path 100 ?
*> 65010:101:192.168.205.0/30 [2001] 10.0.1.2 Only Path 100 ?
*> 65010:101:192.168.1.0/30 [28] 192.168.101.101 Only Path 100 65010 ?
*> 65010:101:192.168.2.0/30 [29] 192.168.101.101 Only Path 100 65010 ?
*> 65010:101:192.168.202.0/24 [30] 192.168.101.101 Only Path 100 65010 65002 i
*> 65010:101:10.10.10.1/32 [31] 192.168.101.101 Only Path 100 65010 65001 ?
*> 65010:101:10.10.10.2/32 [32] 192.168.101.101 Only Path 100 65010 65002 ?
*> 65010:101:192.168.201.0/24 [33] 192.168.101.101 Only Path 100 65010 65001 i
*> 65010:101:192.168.4.0/30 [1000] 0.0.0.0 Only Path ?
*> 65010:101:10.10.10.4/32 [1001] 192.168.4.2 Only Path ?
*> 65010:101:192.168.204.0/30 [1001] 192.168.4.2 Only Path ?
*> 65010:101:192.168.3.0/30 [19] 10.0.1.3 Only Path 0 100 ?
*> 65010:101:192.168.203.0/24 [20] 10.0.1.3 Only Path 0 100 ?
*> 65010:101:10.10.10.3/32 [18] 10.0.1.3 Only Path 0 100 ?
bgpd>
Ryu BGP1
Ryu BGP2
LocalPreference
が付与できない
18

19. PE1 P1
PE2
P2
AS65010側で生成した経路情報を、i-BGP経由
で受信した場合には、MED値が表示されない
ASBR3
CE4
CE3
CE1
CE2
RR
AS 65010(既設)
AS 65001
AS 65002
ASBR4
PE3
Ryu BGP1
Ryu BGP2
AS 65011(増設) CE5
bgpd> show rib vpnv4
Status codes: * valid, > best
Origin codes: i - IGP, e - EGP, ? - incomplete
Network Labels Next Hop Reason Metric LocPrf Path
*> 65010:101:192.168.3.0/30 [19] 10.0.1.3 Only Path 0 100 ?
*> 65010:101:192.168.203.0/24 [20] 10.0.1.3 Only Path 0 100 ?
*> 65010:101:10.10.10.3/32 [18] 10.0.1.3 Only Path 0 100 ?
*> 65010:101:192.168.5.0/30 [2000] 0.0.0.0 Only Path ?
*> 65010:101:10.10.10.5/32 [2001] 192.168.5.2 Only Path ?
*> 65010:101:192.168.205.0/30 [2001] 192.168.5.2 Only Path ?
*> 65010:101:192.168.202.0/24 [30] 192.168.101.101 MED 100 65010 65002 i
* [33] 192.168.102.101 200 65010 65002 i
*> 65010:101:192.168.201.0/24 [33] 192.168.101.101 MED 100 65010 65001 i
* [36] 192.168.102.101 200 65010 65001 i
*> 65010:101:192.168.204.0/30 [1001] 10.0.1.1 Only Path 100 ?
*> 65010:101:10.10.10.4/32 [1001] 10.0.1.1 Only Path 100 ?
*> 65010:101:192.168.2.0/30 [29] 192.168.101.101 MED 100 65010 ?
* [29] 192.168.102.101 200 65010 ?
*> 65010:101:10.10.10.1/32 [31] 192.168.101.101 MED 100 65010 65001 ?
* [34] 192.168.102.101 200 65010 65001 ?
*> 65010:101:192.168.1.0/30 [28] 192.168.101.101 MED 100 65010 ?
* [28] 192.168.102.101 200 65010 ?
*> 65010:101:10.10.10.2/32 [32] 192.168.101.101 MED 100 65010 65002 ?
* [35] 192.168.102.101 200 65010 65002 ?
*> 65010:101:192.168.4.0/30 [1000] 10.0.1.1 Only Path 100 ?
bgpd>
19

20. PE3#show bgp vpnv4 unicast all
BGP table version is 58, local router ID is 10.0.1.3
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,
r RIB-failure, S Stale, m multipath, b backup-path, f RT-Filter,
x best-external, a additional-path, c RIB-compressed,
PE1 P1
PE2
P2
ASBR3
CE4
CE3
CE1
CE2
RR
AS 65010(既設)
AS 65001
AS 65002
ASBR4
PE3
Ryu BGP1
Ryu BGP2
AS 65011(増設) CE5
Origin codes: i - IGP, e - EGP, ? - incomplete
RPKI validation codes: V valid, I invalid, N Not found
!
Network Next Hop Metric LocPrf Weight Path
Route Distinguisher: 65010:101 (default for vrf customerA)
* i 10.10.10.1/32 192.168.101.101 100 0 65010 65001 ?
* i 10.10.10.2/32 192.168.101.101 100 0 65010 65002 ?
*> 10.10.10.3/32 192.168.3.2 0 32768 ?
*>i 10.10.10.4/32 10.0.1.1 100 0 ?
*>i 10.10.10.5/32 10.0.1.2 100 0 ?
* i 192.168.1.0/30 192.168.101.101 100 0 65010 ?
* i 192.168.2.0/30 192.168.101.101 100 0 65010 ?
*> 192.168.3.0/30 0.0.0.0 0 32768 ?
*>i 192.168.4.0/30 10.0.1.1 100 0 ?
*>i 192.168.5.0/30 10.0.1.2 100 0 ?
* i 192.168.201.0 192.168.101.101 100 0 65010 65001 i
* i 192.168.202.0 192.168.101.101 100 0 65010 65002 i
*> 192.168.203.0 192.168.3.2 0 32768 ?
*>i 192.168.204.0/30 10.0.1.1 100 0 ?
*>i 192.168.205.0/30 10.0.1.2 100 0 ?
PE3#
AS65010側で生成し
た経路情報の最適パスが
表示されない
20
AS65010から受信した
経路情報に対して、
LoopBackアドレスへ
の書き換えが行われてい
ない

21. わかったこと、
> 現段階のRyu BGPは、i-BGPピアに関わる機能配備には
適用が困難そうだと感じた。
> 現段階のRyu BGPは、BGPピアの終端点への配備を
前提とした機能具備がなされている。
> BGPピアの中継点に配備する場合には、BGPパラメータ
の伝搬に関わる留意点を想定する必要がある。
> OSPFルーティングドメイン等との連携については、
使い手が自前で準備する必要がある。
-> NextHopへの到達性への対応も別途必要
-> データプレーン連携に関わる対応も別途必要
ちなみに、今回は、すべて静的ルーティング設定を事前に
行うことで対応した。