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NTT Communications Corporation All Rights Reserved. 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 20G20G Aichi Core 440G Osaka POP パケット 携帯網 (Dopa) 高速ディジタル/FR 携帯網 高速ディジタル FR IPルーティング網 接続専用サービス LAN PHS網 NTT-COM ハウジングビルLANLAN SDSLADSL FTTH B ADSL LAN LAN PSTN/ISDN Ether/FE/GE ATM/STM FWA LAN ADSLFTTH 専用線 帯域 確保 専用線 Ether/FE/GE ATM/STM ISDN ISDN ISDN LAN Osaka Core The internet The Internet VERIO IX (Tokyo) Private Peers (Osaka) IX (Osaka) Private Peers (Tokyo) AS4713 - Backbone AS4713 - Edge 40G X0G Tokyo POP ntt.net XX0G 90G Tokyo 560G Osaka 480G 480G BGP4(+) BGP4(+) BGP4(+) Core routes To flet’s/business customers BGP4(+) / OSPF(3) Consumer custmers(IPv4/v6) Business customers(IPv4/v6)
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NTT Communications Corporation All Rights Reserved. ! ’ core edge1, 2 core edge 3 BGP customers customers Core Router Peering Router1 Peering Router2 Housing service Router
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NTT Communications Corporation All Rights Reserved. ! aggregate core aggregate core aggregate aggregate OSPF Area 0 edge ACT edge ②looks up BGP routes and forwards edgeα’s loopback because aggregate router know BGP routes. SBY edge ①look up the default-route when packet comes from downlink. because edge router is non BGP router. Internal routers Peering/Transit routers OSPF Area 1 Destnation address 192.168.1.1/24
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NTT Communications Corporation All Rights Reserved. OSPF Area 0 OSPF Area 1 aggregate core aggregate core aggregate aggregate Internal routers Peering/Transit routers edge ACT edge SBY edge 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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NTT Communications Corporation All Rights Reserved. OSPF Area 0 OSPF Area 1 aggregate core aggregate core aggregate aggregate edge ACT edge SBY edge 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/Transit routers !
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NTT Communications Corporation All Rights Reserved. OSPF Area 0 OSPF Area 1 aggregate core aggregate core aggregate aggregate edge Internal routersPeering/Transit routers SBY edge ACT edge 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
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NTT Communications Corporation All Rights Reserved.41 ! R1 R2 ASBR1 (MED10) ASBR-2 (MED20) iBGP eBGP * i MED 10 * e MED 20 * i MED 10 * e MED 10 MED 30 * i MED 20 * i MED 20 2mins at R1 ASBR-1 (MED10)
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NTT Communications Corporation All Rights Reserved.42 ! 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,KD DI, NTT MCL
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NTT Communications Corporation All Rights Reserved.43 * i MED 10 e MED 20e MED 20 ! R1 R2 ASBR1 (MED10) ASBR-2 (MED20) iBGP eBGP * i MED 10 not advertise to any peers only best paths * i MED 10 * e MED 10
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NTT Communications Corporation All Rights Reserved.44 e MED 20 ! R1 R2 ASBR1 (MED10) ASBR-2 (MED20) iBGP eBGP * i MED 10 long time to change the paths * e MED 10 MED 30 * i MED 20 updates updates * i MED 20 i MED 30 updates i MED 30 * * i MED 10 updatesupdates
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NTT Communications Corporation All Rights Reserved.45 * i MED 10 e MED 20e MED 20 ! R1 R2 ASBR1 (MED10) ASBR-2 (MED20) iBGP eBGP * i MED 10 * e MED 10 Backup paths i MED 20 best-external MED20 MED20 best-external
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NTT Communications Corporation All Rights Reserved.46 e MED 20 ! R1 R2 ASBR1 (MED10) ASBR-2 (MED20) iBGP eBGP * i MED 10 More quickly * e MED 10 MED 30 * i MED 20 updates updates i MED 30 updates i MED 30 * * i MED 10best-externalbest-external i MED 20* i MED 20
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NTT Communications Corporation All Rights Reserved.47 0.0%$ 10.0%$ 20.0%$ 30.0%$ 40.0%$ 50.0%$ 60.0%$ 70.0%$ 80.0%$ 90.0%$ 100.0%$ 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$2nd$ ! 130sec 95sec 27% improved
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NTT Communications Corporation All Rights Reserved.49 ! R1 R2 ASBR1 (MED10) ASBR-2 (MED20) iBGP eBGP a logical IF a physical IF 210sec at R1
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NTT Communications Corporation All Rights Reserved.50 • • • 50 OSPF hello
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NTT Communications Corporation All Rights Reserved.53 ! ! !
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