access point redundancy - mikrotikmum.mikrotik.com/presentations/pl12/grifonline.pdf · access...
TRANSCRIPT
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Access Point Redundancy by Lorenzo Busatti
MUM Warsaw 2012 ©Grifonline S.r.l., http://training.grifonline.it 1
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Lorenzo Busatti
Grifonline S.r.l., Grosseto – ITALY
ISP for more 15 years, WISP for more 6 years
MikroTik Certified Trainer / Consultant
• For: MTCNA, MTCWE, MTCRE, MTCTCE, MTCUME, MTCINE
• Specialization: Wireless, Routing
MUM Warsaw 2012 ©Grifonline S.r.l., http://training.grifonline.it 2
About me
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Presentation Objectives
•Raise awareness on the issue of redundancy of access points used in base stations
•Provide a starting point for a setup
MUM Warsaw 2012 ©Grifonline S.r.l., http://training.grifonline.it 3
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Uptime!
•The Uptime of a wireless service should be 100%.
•The more is closer to 100% the more the wireless users will be happy
MUM Warsaw 2012 ©Grifonline S.r.l., http://training.grifonline.it 4
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Which Wireless Users?
•WISPs users
•Hotels & Conferences Users
•Corporate Offices Users
Any user in any wireless network
MUM Warsaw 2012 ©Grifonline S.r.l., http://training.grifonline.it 5
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Basics common failures
•Power failure
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Basics common failures
•Power failure
Can be solved with
• The use of UPS or batteries
MUM Warsaw 2012 ©Grifonline S.r.l., http://training.grifonline.it 7
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Basics common failures
•Power supply failure
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Basics common failures
•Power supply failure
Can be solved with
• The use of redundant power system
MUM Warsaw 2012 ©Grifonline S.r.l., http://training.grifonline.it 9
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Internet Backbone
•With two or more ISP you can setup RouterOS for having a backup line, in case one of the ISPs will go down.
MUM Warsaw 2012 ©Grifonline S.r.l., http://training.grifonline.it 10
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Internet Backbone (as AS)
•With BGP it’s easy to setup more than one Internet upstream
• If one of the peers goes down there is another one(s).
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Basic Network Example Clients
Access
Point
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Internet
Router Wireless Link
(or a cable, fiber, ….)
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Transport Redundancy
•Thanks to RSTP or OSPF or MPLS any network transport can be redunded. All transport links can be “doubled” and the network will be more reliable.
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Advanced Network Example Clients
Access
Point
MUM Warsaw 2012 ©Grifonline S.r.l., http://training.grifonline.it 14
Internet peer 1
BGP
Router
Internet peer 2 Double transport Links (or
a cable, fiber, ….)
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Advanced Network Example Clients
Access
Point
MUM Warsaw 2012 ©Grifonline S.r.l., http://training.grifonline.it 15
Internet peer 1
BGP
Router
Internet peer 2
Doubled transport Links
(or a cable, fiber, ….)
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Advanced Network Example Clients
Access
Point
MUM Warsaw 2012 ©Grifonline S.r.l., http://training.grifonline.it 16
Internet peer 1
BGP
Router
Internet peer 2
Doubled transport Links
(or a cable, fiber, ….)
And just a SINGLE AP ……
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Advanced Network Example Clients
Access
Points
MUM Warsaw 2012 ©Grifonline S.r.l., http://training.grifonline.it 17
Internet peer 1
BGP
Router
Internet peer 2
Doubled transport Links
(or a cable, fiber, ….)
Maybe you can add one more!
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The advantages of double APs
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Failover
•With RouterOS you can have a failover system for your APs
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Failover
•With RouterOS you can have a failover system for your Aps
•Without external software or hardware
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Failover
•With RouterOS you can have a failover system for your Aps
•Without external software or hardware ($$$$$)
•Just doubling the Aps ($)
MUM Warsaw 2012 ©Grifonline S.r.l., http://training.grifonline.it 21
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In the Real Environments
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Advantages
•Doing long term scan
•Doing long term snooper
•Doing long term Freq. Usage
•Doing long term Spectral Scan
•Doing long term Spectral History
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Advantages
•Doing RouterOS update
•Trying different radio cards
•Avoid Antenna failure
•Avoid RF Cable failure
•Doing …. Trying …. Scan ….. ….
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Without disconnecting the Clients!
(maybe just for few seconds ….)
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How to manage double APs (Failover)
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RouterOS HowTo
•Thanks to RouterOS's features it is possible to have “hot spare” APs in few easy steps.
•And thanks to his flexibility there are “lot” of ways to do this.
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Planning the behavior
•How do you want your “spare” AP will react?
•Don’t exist exact rules, with RouterOS you are free to decide.
• I will show you just one example, a starting point.
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Planning the behavior Clients
Access
Points
MUM Warsaw 2012 ©Grifonline S.r.l., http://training.grifonline.it 29
• We want the “spare” AP will have the wireless OFF when the main AP is working.
MA
IN A
P
SP
AR
E A
P
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Planning the behavior Clients
Access
Points
MUM Warsaw 2012 ©Grifonline S.r.l., http://training.grifonline.it 30
• We want the “spare” AP will have the wireless OFF when the main AP is working.
• We don’t want both APs with wireless cards ON at the same time.
MA
IN A
P
SP
AR
E A
P
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Planning the behavior Clients
Access
Points
MUM Warsaw 2012 ©Grifonline S.r.l., http://training.grifonline.it 31
• We want the “spare” AP will have the wireless OFF when the main AP is working.
• We don’t want both APs with wireless cards ON at the same time.
• We want a “protection” from ethernet disconnections or failures, when the routers are powered ON
MA
IN A
P
SP
AR
E A
P
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VRRP
MUM Warsaw 2012 ©Grifonline S.r.l., http://training.grifonline.it 32
• With an “easy” VRRP setup you can avoid:
• Router failures;
• Power failures
Access
Points
MA
IN A
P
SP
AR
E A
P
Clients
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VRRP
MUM Warsaw 2012 ©Grifonline S.r.l., http://training.grifonline.it 33
• With an “easy” VRRP setup you can avoid:
• Router failures;
• Power failures
• What about ethernet failures?
Access
Points
MA
IN A
P
SP
AR
E A
P
Clients
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A starting point
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• We can use just some simple “netwatch” and scripts for doing all the job.
• Very easy to deploy, to apply, to experiment.
• Later you can develop your own behavior and technology
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Behavior Example
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• For this behavior example we need a “reference” (or fixed) point in the network.
• We can choose the internet gateway.
• If the internet gateway will fail nobody can use the network.
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Behavior Example
MUM Warsaw 2012 ©Grifonline S.r.l., http://training.grifonline.it 36
MA
IN A
P
SP
AR
E A
P
Internet
Gateway
Netwatch
At startup:
WLAN ON At startup:
WLAN OFF
If I can’t ping the
gateway I can
turn off the
WLAN
If I can’t ping the
Main AP but I can
ping the gateway, I
can turn on the
WLAN
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The RouterOS Setup (MAIN AP)
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/tool netwatch
add comment="Ping the Gateway" \
host=192.168.1.1 interval=2s timeout=1s \
down-script="interface wireless disable 0" \
up-script="interface wireless enable 0"
/system script
add name=enablewlan source="/interface wireless enable wlan1"
/system scheduler
add name=enablewlan on-event=enablewlan start-time=startup
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The RouterOS Setup (SPARE AP)
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/tool netwatch
add comment="Ping the Gateway" host=192.168.1.1 interval=2s timeout=1s \
down-script="interface wireless disable 0"
add comment="Ping Master AP" host=192.168.1.2 interval=2s timeout=1s \
up-script="interface wireless disable 0"
/system script
add name=disablewlan source="/interface wireless disable wlan1"
add name=checkAP source="\
:if (([/tool netwatch get 1 status ] = "down") && ([/tool netwatch get 0 status ]
= "up")) do={ \
:if ([/interface wireless get 0 disabled ] = true ) do={ \
[/interface wireless enable 0] } \
}"
/system scheduler
add name=disablewlan start-time=startup on-event=disablewlan
add name=checkAP start-time=startup interval=3s on-event=checkAP
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End of the Settings!
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• Yes, we’re done all the settings for this basic example (as a starting point!).
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Live Demo
The Internet Gateway
192.168.10.1/24
My Laptop
192.168.10.4/24
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The “Main” AP
192.168.10.2/24
A Wireless
Client
192.168.10.5/24
The “Spare” AP
192.168.10.3/24
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Live Demo
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Connect now with your device at the SSID
RedundantApLAB
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Thankyou!
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