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© GN Copyright © 2012 NTT Communications Corporation All Rights Reserved.
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Gunma Core
Miyaagi POP
Hokkaido POP
Kanawaga POP
Chiba POP
Aichi POP
Kyoto POP
Hyogo POP
Hiroshima POP
Fukuoka POP
West Tokyo POP
Tokyo Core
80G
100G
20G
20G
20G
120G
80G
180G
400G
20G 20G
Aichi Core
440G
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パケット 携帯網 (Dopa)
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© GO Copyright © 2012 NTT Communications Corporation All Rights Reserved.
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© HG Copyright © 2012 NTT Communications Corporation All Rights Reserved.
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© HH Copyright © 2012 NTT Communications Corporation All Rights Reserved.
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© HL Copyright © 2012 NTT Communications Corporation All Rights Reserved.
b{�B9�mxw9mn{��9�tu�:�f{x��u{z��
�
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© HM Copyright © 2012 NTT Communications Corporation All Rights Reserved.
f{x��u{z9�{9pqmx9�u�t9Z]V9xuyu��
! ~qp�ouzs9�{yq9~{��q�9�CR9u�9y{��9x{�9o{��9�{~wm~{�zpB9nqom��q9u�9p{q�z��9zqqp9zq�9~{��q~�D9�
CR9jtuot9~{��q�9�t{�xp9nq9~qp�oqpS�GD gtq9uz�q~zq�9r�xx9~{��q�9P9�tq9~{��q�9r~{y9�tq9]z�q~zq��HD gtq9uz�q~zmx9~{��q�9P9�tq9~{��q�9�u�tuz9cWb9?z{�9mp�q~�u�qp9�{9�tq9]z�q~zq�@ ��
! ~q|xmouzs9�{9tust9�|qo9~{��q~�9999CR9u�9tust9o{����
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© HN Copyright © 2012 NTT Communications Corporation All Rights Reserved.
g~{�nxq�9�tqz9~qp�ouzs9~{��q��
! eqp�ouzs9~{��q�9u�9�~{�nxq�{yq�C gtu�9tm||qzqp9mo��mxx�9m�9cWb9yus~m�u{z9{|q~m�u{zD�
aggregate
core
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core
aggregate aggregate
OSPF Area 0
V[d9~{��q~�
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edge�
ACTedge
②looks up BGP routes and forwards
edgeα’s loopback because aggregate router
know BGP routes. SBYedge
①look up the default-route when packet comes from
downlink. because edge router is non
BGP router.
Internal routersPeering/Transitrouters
OSPF Area 1
Destnation address
192.168.1.1/24
![Page 29: APRICOT 2012 - Living with the ever-growing BGP table: an OCN story](https://reader031.vdocument.in/reader031/viewer/2022020410/587bff9e1a28ab7c668b647d/html5/thumbnails/29.jpg)
© HO Copyright © 2012 NTT Communications Corporation All Rights Reserved.
OSPF Area 0
OSPF Area 1
g~{�nxq�9�tqz9~qp�ouzs9~{��q��
aggregate
core
aggregate
core
aggregate aggregate
Internal routersPeering/Transitrouters
edge�
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SBYedge
④Replacing Standby edge router to another aggregation router
which located in same OSPF area
③Replacing this aggregation router when become EOL(End Of life)
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© IF Copyright © 2012 NTT Communications Corporation All Rights Reserved.
OSPF Area 0
OSPF Area 1
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aggregate
core
aggregate
core
aggregate aggregate
edge�
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SBYedge ⑤Despite the migration to
new aggregation router,Act edge router keep forwarding packets to upstream links. Because It don’t know the
BGP routes.
⑥Aggregation router finds new ospf shotest path to
edgeα’s loop back at downlink. Because OSPF
prefer same area path to less metric path.
Internal routersPeering/Transitrouters
! au�ym�otuzs9x{suomx9�{|{x{s�9nq��qqz9Uss~qsm�u{z9mzp9UWg9qpsq9~{��q~�
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© IG Copyright © 2012 NTT Communications Corporation All Rights Reserved.
g~{�nxq�9�tqz9~qp�ouzs9~{��q��
V[d9~{��q~�
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If edge router has BGP routes. Routing loop will not happen. Because edge router
looks up BGP routes and find edge α loopback. As
a result packets are forwarded to new
aggregation router, not to old aggregation router
![Page 32: APRICOT 2012 - Living with the ever-growing BGP table: an OCN story](https://reader031.vdocument.in/reader031/viewer/2022020410/587bff9e1a28ab7c668b647d/html5/thumbnails/32.jpg)
© IH Copyright © 2012 NTT Communications Corporation All Rights Reserved.
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c�~9�u��m�u{z9–9nqr{~q9~q|xmouzs�
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qpsq� qpsq�
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mss~qsm�q� mss~qsm�q�
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© IM Copyright © 2012 NTT Communications Corporation All Rights Reserved.
! eqp�ouzs9~{��q�9ym�9om��q9�~{�nxq��
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© IN Copyright © 2012 NTT Communications Corporation All Rights Reserved.
b{�B9�mxw9mn{��9�tu�:�
f{x��u{z���
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© Copyright © 2012 NTT Communications Corporation All Rights Reserved. 39
c�~9�u��m�u{z�99�
! e]V9o{z�q~sqzoq�C 9b{9�~{�nxq�9�{9rm~9"�C 9g~�uzs9�{9uy|~{�q9�tq9o{z�q~sqzoq9�uyq�
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© Copyright © 2012 NTT Communications Corporation All Rights Reserved. 40
gtq9e]V9W{z�q~sqzoq9�
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© Copyright © 2012 NTT Communications Corporation All Rights Reserved. 41
c�~9o{z�q~sqzoq9�uyq9�
! e]V9o{z�q~sqzoq9?;9{r9|~qru�q�9P9�J9KFFFFFB9�L9KFFFF@�
R1 R2
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* i MED 10 * e MED 20
gtq9]z�q~zq��
* i MED 10�
* e MED 10 MED 30
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2mins at R1 �
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© Copyright © 2012 NTT Communications Corporation All Rights Reserved. 42
gqotzuomx9f{x��u{z�9�{9pqmx9�u�t9�tq9o{z�q~sqzoq�
! g{9tm�q9nmow�|9|m�t��
Solution add-path BGP Best External
+Full mesh diverse-path
Internet-draft draft-ietf-idr-add-paths
draft-ietf-idr-best-external
draft-ietf-grow-diverse-bgp-path-
dist Current I-D
version 06 05 06
Author Cisco,Juniper,HP Cisco, Juniper Cisco,Verisign,KDDI, NTT MCL
jq9�q��qp9�tu�9:�
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© Copyright © 2012 NTT Communications Corporation All Rights Reserved. 43
* i MED 10 e MED 20 e MED 20�
Vqr{~q9V[d9nq��Cq��q~zmx�
! eGEH9tm�q9{zx�9nq��9|m�t��
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not advertise to any peers�
only best paths�
* i MED 10�
* e MED 10 �
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© Copyright © 2012 NTT Communications Corporation All Rights Reserved. 44
�e MED 20
Vqr{~q9V[d9nq��Cq��q~zmx�
! jtqz9�tq9aYX9�mx�q9u�9otmzsqp9m�9eG�
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|~qru�q��
gtq9]z�q~zq��
* i MED 10 � long time to
change the paths�
* e MED 10 MED 30
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updates updates
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updates i MED 30�* �* i MED 10
updates updates
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© Copyright © 2012 NTT Communications Corporation All Rights Reserved. 45
* i MED 10 e MED 20 e MED 20�
Ur�q~9V[d9nq��Cq��q~zmx�
! eGEH9tm�q9nmow�|9|m�t��
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Backup paths�
i MED 20�
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© Copyright © 2012 NTT Communications Corporation All Rights Reserved. 46
�e MED 20
Ur�q~9V[d9nq��Cq��q~zmx�
! jtqz9�tq9aYX9�mx�q9u�9otmzsqp9m�9eG�
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More quickly
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i MED 20� * i MED 20�
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© Copyright © 2012 NTT Communications Corporation All Rights Reserved. 47
0.0%$
10.0%$
20.0%$
30.0%$
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70.0%$
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sec$ 0$$ 5$$ 10$$ 15$$ 20$$ 25$$ 30$$ 35$$ 40$$ 45$$ 50$$ 55$$ 60$$ 65$$ 70$$ 75$$ 80$$ 85$$ 90$$ 95$$100$$105$$110$$115$$120$$125$$130$$135$$140$$
disable$best7external$1st$
disable$best7external$2nd$
enable$best7external$1st$
enable$best7external$2nd$
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! gtq9o{z�q~sqzoq9�uyq�9�q~q9uy|~{�qp�C jtqz9otmzsuzs9�tq9aYX9�mx�q9m�9UfVeCG�C ;9{r9|~qru�q�9]d�J9JHFBFFF99]d�L9IIBFFF�
��m~�qp9�|pm�uzs9�tq9e]V�
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gtq9Z]V9W{z�q~sqzoq9�
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c�~9Z]V9o{z�q~sqzoq9�uyq9�
! Z]V9o{z�q~sqzoq9?;9{r9|~qru�q�9P9�J9KFFFFFB9�L9KFFFF@�
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a logical IF a physical IF 210sec
at R1 �
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• jq9�q~q9rmouzs9m9|~{nxqyP�C cfdZ9zqustn{~9�qz�9p{�z9p�q9�{9Z]V9�mnxq9o{z�q~sqzoq�
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