Moving an exchangepoint - What happened?

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1 Moving an exchangepoint - What happened? Kurtis Lindqvist <kurtis@netnod.se>

2 Who are Netnod? Largest Internet exchangepoint in Sweden Operations in four cities Stockholm, Malmö, Gothenburg, Sundsvall Various medias in use at various locations Gigabit Ethernet, FDDI, DPT622 and DPT2.5G Sida 1

3 Who are Netnod? Focus have been on redundancy Switches and shared infastructure are in government owned mountain caves Each of the technologies are redundant Each of the locations are redundant Sida 2

4 The test Locations in Stockholm called A and B. Not enough space in A Migration to a new location needed This would take down half of the redundancy Sida 3

5 Netnod setup - GigE 1 Customer router A B Extreme switches FDDI Switches Sida 4

6 Netnod setup - GigE 2 Customer routers A B Extreme switches FDDI Switches Sida 5

7 Netnod setup - DPT Sida 6

8 and then we migrated A so what happened? Nothing really Sida 7

9 Government project Study of the overall stability of the Internet in Sweden DNS Exchange points Gathered a number of data BGP logs of 10 ISPs almost BGP listening on US East/west coast Load graphs Connection characteristics of 10 locations Sida 8

10 Traffic shifted as planned Sida 9

11 BGP Activity in the US - Withdrawals Sida 10

12 BGP Activity in the US - Advertisements Sida 11

13 BGP Activity - details Sida 12

14 Failed connection attempts Andel misslyckade uppkopp 0,70% 0,60% 0,50% 0,40% 0,30% 0,20% 0,10% 0,00% Före Under Efter Sida 13

15 Packetloss IP-paketförlu 5,00% 4,50% 4,00% 3,50% 3,00% 2,50% 2,00% 1,50% 1,00% 0,50% 0,00% Sida 14

16 18,00% 16,00% 14,00% 12,00% 10,00% 8,00% 6,00% 4,00% 2,00% 0,00% Packetloss - details Paketförluster Sida Tid Serie1

17 Packet delay IP-paket fördröjning (ms) 160,00 140,00 120,00 100,00 80,00 60,00 40,00 20,00 0, Sida 16

18 Packet delay -details Roundtriptime sekvensnumme modo-leksand djurgarden-leksand modo-brynas timra-brynas hv71-brynas malmo-brynas sodertalje-modo malmo-modo brynas-timra hv71-timra malmo-timra djurgarden-timra malmo-sodertalje brynas-hv71 timra-hv71 sodertalje-hv71 malmo-hv71 brynas-malmo modo-malmo timra-malmo hv71-malmo djurgarden-malmo leksand-djurgarden timra-djurgarden malmo-djurgarden Sida 17

19 TCP Throughput TCP-genomströmning (k 1600, , , , , , ,00 900,00 800,00 700,00 600,00 500,00 400,00 300,00 200,00 100,00 0, Sida 18

20 What conclusions can we make? Exchange points are not really crucial Some ISPs actually shifted the traffic beforehand Interconnects can be made stable Layer 2 convergence will help But GigE can also be made to work but you need to be careful Sida 19

21 So what do we think happened? Well, the only thing that really changed was the NEXT_HOP Backup paths was known So BGP recalculation was very limited, if at all But this needs planning and luck! And not necessarily in that order Sida 20

22 Operational stability This proves that major topology changes can be done with little impact Or that IXPs are irrelevant Operational stability is becoming more and more important Mostly based on commercial reasons But there might be other needs as well How dependent is your country on the Internet? Sida 21

23 Conclusions Built right, an IXP can prove to be a very reliable tool for exchanging traffic Some of the characteristics are hard to get with private peerings Maybe there is a future for IXPs. Sida 22

24 ? Sida 23

25 Contact Netnod Internet Exchange i Sverige AB Bellmansgatan 30 I SE Stockholm Sweden Office address: Bellmansgatan 30 I Telephone: Telefax: kurtis@netnod.se URL: http// Sida 24

Configuring Bidirectional Forwarding Detection for BGP

CHAPTER 7 Configuring Bidirectional Forwarding Detection for BGP This chapter describes how to configure Bidirectional Forwarding Detection (BFD) for BGP. This chapter includes the following sections: