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Redundancy in the UCAR Network Teresa Shibao February 19, 2008

Redundancy in the UCAR Network Teresa Shibao February 19, 2008. Service Criticality Levels. Level 1 – Facilities Life Safety Components Fire Systems, Elevators, Physical Security, Phones/911 Access Level 2 – Critical Corporate Services

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Redundancy in the UCAR Network Teresa Shibao February 19, 2008

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  1. Redundancy in the UCAR Network Teresa Shibao February 19, 2008

  2. Service Criticality Levels • Level 1 – Facilities Life Safety Components Fire Systems, Elevators, Physical Security, Phones/911Access • Level 2 – Critical Corporate Services Power, Network Connectivity, DNS, Authentication, Corporate Financial Systems, Email, Super Computing & Mass Store • Level 3 – Divisional & Secondary Services Central & Division Computing, UCAR Web, VPN, Wireless Network, RAS, Long Distance Telephony • Level 4 – Central Corporate Applications End-User Business Applications

  3. Resiliency • One way to mitigate outages is to integrate redundancy in the system hardware and services • In the Network Closet • On the Campus • Between the campuses • Over the WAN • In the Phone System

  4. In the Network Closet • Redundant Power • Wall • UPS/Generator • Redundant Supervisors • Etherchanneled uplinks

  5. On the Campus • Routing in 2 chassis per campus • 2 Paths from each closet to the core

  6. Layer 2 Hardening • Part of the Routing Redundancy project includes optimizing spanning tree for fast convergence and protection. • Place the Root where you want itThe primary core switch should be the Root of the vlan, the ports to the secondary core switch should be blocked by spanning tree. • Only end station traffic should be seen on an edge portEnable BPDU Guard on the edge/host ports

  7. Other Changes • Move routing for the Voice vlans to the campus routers • Upgrade primary core switches to Sup720 • Convert flra and cgra from CatOS to IOS • Upgrade primary paths to 10GML – FL and FL – tcom

  8. Between the Campuses • BRAN • Wireless Backup

  9. Over the WAN • BiSON(top ring) • FRGP/DREAM(bottom ring)

  10. In the Phone System • Cluster Call Control • 911 Service • Trunking • Voice Messagingis not redundant • Power

  11. Summary • Complexity can undermine reliability • keep it simple • Single Points of Failure • Ports to office • Voicemail • BPoP Switch • Test • How do you know it works? • You are never done

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