1. RIPE32 EIX LINX Update LINX now has 63 members New infrastructure in place Gigabit backbone in place Some things we have learned! Second site now in use Statistics What’s coming in 1999

2. LINX membership Now totals 63 Recent members: RedNet (UK) XTML (UK) Carrier 1 (EU) Mistral (UK) GTE Internetworking (US) Above Net (US) Telecom Eireann (Ireland) Level 3 Communications (UK) Dialnet (UK)

3. New Infrastructure Catalyst and Plaintree switches no longer in use. Catalyst 5000s appeared to have broadcast scaling issues regardless of Supervisor Engine. Plaintree switches had proven too unstable and unmanageable. Catalyst 1200s at end of useful life.

4. New Infrastructure Packet Engines PR-5200 Chassis based 16 slot switch Used by us for primary our core, primary switches One in Telehouse, one in Telecity Will need a second one in Telehouse within this quarter Supports 1000LX, 1000SX, FDDI and 10/100 ethernet

5. New Infrastructure Packet Engines PR-1000 Small version of PR-5200 1U switch; 2x SX and 20x 10/100 Same chipset as 5200 - so same features. Members connected downstairs in Telehouse enjoy same benefits of those connected to the main Telehouse switch or the Telecity switch

6. New Infrastructure Extreme Summit 48: Used for members second connections Gives vendor resiliency Excellent edge switch - low cost per port and 2x Gigabit, 48x 10/100 ethernet

7. New Infrastructure Topology changes: Aim to be able to have major failure in one switch without affecting member connectivity Aim to have major failures on inter-switch links with out affecting connectivity Ensure that inter-switch connections are not bottlenecks

9. New backbone All primary inter-switch links are now gigabit New kit on order to ensure that all inter-switch links are gigabit Inter-switch traffic minimised by keeping all primary and all backup traffic on their own switches

10. Future backbone work New projects: Introduce spanning tree for automatic management of inter- switch links At present, this is done manually Ability to add extra satellite sites using a small switch on the end of a gigabit link

11. What we have learned... the hard way! Problems after renumbering Some routers still using /24 netmask Some members treating the /23 network as two /24s Big problem if proxy arp is involved! Broadcast traffic bad for health We have seen >50 ARP requests per second at worst times.

12. Second Site Telecity Site: Has a Packet Engines PR-5200 Has a Summit 48 Looks similar to the Telehouse site: Has a transit router Is about to have machines to act as hot backups for the servers in Telehouse Will have a K.root server soon

13. Statistics LINX total traffic 300 M/sec ave, 405 M/sec peak Routing table 9,200 out of 55,000 routes k.root-servers 2.2 Mbit/sec out, 640 Kbit/sec in nic.uk 150 Kbit/sec out, 60 Kbit/sec in

14. Statistics and looking glass at http://www2.linx.net/

15. Things planned for ‘99 Infrastructure spanning tree implementation Completion of Stratum-1 NTP server Work on an ARP server Implementation of route server Implementation of test traffic box