We will now look at the design of an internet exchange point. The exchange point core as we've already mentioned is an Ethernet switch and it must be a managed switch, in other words, where the operator can login to the switch, configure features on different ports and manage the performance and behavior of the switch itself. It must have reasonable security features in fact Euro IX has documented typical details they would expect an Ethernet switch for an exchange part to have the Ethernet switch has superseded all other types of network devices for an internet exchange point these days a small starter exchange part would have a small managed 12 or 24 port Gigabit Ethernet switch there's really no purpose or anything to be gained for going with anything smaller than this at the other end of the scale were now looking even at switches that can handle high densities of 10 Gigabit Ethernet 40 Gigabit Ethernet and even hundred gigabyte the net with 400 gigabit ethernet now being talked about at the top end of the range each isp participating in the exchange point brings a router to the IXP location note however that with increasing availability of fiber access rsps are now connecting directly to the IXP without provisioning a dedicated router at the exchange part location this router border router for the isp needs an ethernet port to connect to the exchange part switch and a wine port to connect back to the isp back board and of course the router needs to be able to run BGP the IXP switch is located in one equipment rack dedicated to the exchange part the rack could also contain other operational equipment that's used by the internet exchange if the participant ISPs are bringing in routers these are always located in neighboring Jason wrecks most exchange parts try and avoid having a member equipment co-located in the same rack as the IXP switch and this allows the exchange part room to expand as the exchange part grows copper connections usually unshielded twisted-pair are made 400 megabits or one gigabit connections fiber is used for one gigabit and higher speeds to connect to the switch for the peering setup each participant needs to run BGP they need their own autonomous system number and it needs to be a public autonomous system number not a private ASM public EAS numbers are readily available from all the registries and of course an a s number will be assigned because it means the participant will be using BGP to talk to multiple other participants and indeed to their own upstream providers as well each participant configures external BGP directly with other participants at the exchange point. They may choose to peer with all participants or peer with a subset of participants. The choice is entirely up to the participant.
© Produced by Philip Smith and the Network Startup Resource Center, through the University of Oregon.
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