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Transcript
How To Build a Redundant, Fault Tolerant, Load Balanced, Traffic Managed Wireless network a bella mia company A Little Background • Jeremy Kinsey “Known as Jer” to his friends. • CEO and Co-Founder of Bella Mia, Inc. • Been an ISP for 6 years • Been a WISP for 2 + years So you are a Wireless ISP But how do you make your system Redundant? Some Assumptions • You have at least 2 WPOPS (Wireless Points of Presence) • You already have a redundant network, ie., are running BGP, have two providers, etc. • You have a good understanding of Cisco Routers and various routing protocols. Assuming you have all that, lets take a look at how things break down. Break down of Redundant WPOP Setup NOC Your Network Operations Center Connected to multiple Providers Running BGP WPOP 1 Your Wireless POP/Tower Land line from your NOC Cisco Router PTP Wireless Link to Tower 2 Cisco Router Bandwidth Manager WPOP 2 Your other Wireless POP/Tower Land Line from your NOC Cisco Router PTP Wireless Linke to Tower 1 Lets Start at the WPOP • 3 180 degree Sectors • 3 runs of Heliax • 4 radios Proxim COR’s • Cisco 1600 Series Router • UPS • Switch Where do the pieces fit? • One Sector per side of tower • One Radio per sector • UPS, Radio, Switch, Router in enclosure at tower base. • Router connected to T1 and NOC The Big Picture Wireless PTP WPOP 1 T1 WPOP 2 T1 Bandwidth Manager Internet Router NOC So what do we have? Redundancy at the WPOP (3 separate radios & antennas) Redundancy in the entire system (multiple paths, traffic re-routed on the fly) Shared bandwidth (load balanced traffic, and bandwidth delivered where it is needed on demand) Another Key Point! Maintenanc e! _ Imagine Near Zero Down Time • Easily add to existing infrastructure • Upgrade Remote Devices • Replace Downed Gear But does it Work? Well Let’s See it in Action! Some Examples WPOP 1 Aggregate Traffic WPOP 2 Aggregate Traffic Traffic Flow over PTP between WPOP 1 & WPOP 2 What does it look like when a pipe goes down? PTP under normal PTP with 1 T1 Down conditions • 1 Pipe goes down, traffic automatically re-routed over backup link • Pipe comes back up, PTP traffic will return to normal • Your users never know what happened Where do you go from here? Endless Expansion! Wireless PTP WPOP 3 Wireless PTP WPOP 1 Wireless PTP WPOP 2 T1 T1 Bandwidth Manager Wireless PTP to NOC Internet WPOP 4 Router NOC So How Do I Do It? • Now for the routing side of the “Keeping It Up”session • Josh Easton, CTO Bella Mia, Inc. • Routing protocols used and why OSPF • Open Shortest Path First • Allows for redundancy • Smarter routing of traffic Brief intro to OSPF • Every network link (T1, ethernet, etc.) has a cost • When multiple paths are available, lowest cost path is chosen • Costs can be manipulated to route your traffic ideally How does OSPF fit in? Cost = 10 Wireless PTP WPOP 1 T1 Cost = 64 T1 WPOP 2 Cost = 64 Bandwidth Manager Internet Router NOC Why these costs? • T1 has a default cost of 64 • 10Mbit ethernet’s default cost is 10 • Traffic from WPOP1 to WPOP2 will take the wireless PTP link if it’s available, else it will use T1s • Traffic from WPOP1 to Internet goes via the local T1, else via the wireless PTP link to WPOP2 and then via WPOP2’s T1 Sample Cisco router config • Note: Need IP+ image to do OSPF on 1600 interface Ethernet0 ip address 10.0.0.1 255.255.255.0 ! Just an example ip ospf message-digest key 1 md5 <Put OSPF password exit interface Serial0 ip address 10.0.1.1 255.255.255.0 ! Just an example ip ospf message-digest key 1 md5 <Put OSPF password exit router ospf 100 redistribute connected subnets redistribute static subnets network 10.0.0.1 0.0.0.0 area 0 network 10.0.1.1 0.0.0.0 area 0 default-information originate always area 0 authentication message-digest ospf log-adjacency-changes exit ip address here> ip address here> OSPF in a larger network Cost = 45 Wireless PTP WPOP 3 Cost = 10 Wireless PTP WPOP 1 Cost = 10 Wireless PTP Cost = 64 Cost = 64 T1 WPOP 2 T1 Bandwidth Manager Wireless PTP to NOC Cost = 10 Internet WPOP 4 Router NOC Why these costs? • Cost from WPOP1 to WPOP3 is manually set at 45 • Traffic from one WPOP to another WPOP will use the wireless backbone by default • WPOP3 and WPOP4 use WPOP4’s link to the NOC to get on the Internet • WPOP1 and WPOP2 use their T1s to get on the Internet • If any link goes down, traffic will be routed around the damage Questions? bella mia, inc - mia.net “Keeping it Up” by Jeremy Anthony Kinsey CEO bella mia, inc. Josh Easton CTO bella mia, inc www.dslone.com www.wisconsinwireless.net Copyright 2002 bella mia, inc