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Control BGP
from your Applications
Whatever a speaker is missing in depth he will compensate for in length
Montesquieu
LINX 74 - August 2011
Thomas Mangin
Exa Networks
1Friday, 22 July 11
Dynamically Change Routing
DDOS filtering
IWF interception
Traffic engineering
Suspend customers
IP announcement ..
AnyCast
Control “cloud” IPs from a central location
Active / Passive servers solution with service monitoring
Why ?
2Friday, 22 July 11
Permanent configuration generation
1 - Regenerating BIRD/Quagga/OpenBGPD configuration on change
2 - Getting the daemon to reload its configuration
3 - Go back to 1
There must be a better way ...
OpenBGPD bgpctl
BIRD birdc
Quagga / Zebra telnet ..
There must be a better way ......
How ?
Logic will get you from A to B. Imagination will take you everywhere
Albert Einstein
3Friday, 22 July 11
1 - take your favourite language : perl, python, lua, C, shell, french ! ...
2 - create a forever loop
3 - print what you want to do ...
4 - ... profit ?
Demon!ration !
#!/bin/sh
# ignore Control C
trap '' SIGINT
while `true`;
do
echo "announce route 192.0.2.1 next-hop 10.0.0.1"
sleep 10
echo "withdraw route 192.0.2.1 next-hop 10.0.0.1"
sleep 10
done
flap.sh
4Friday, 22 July 11
Integration
neighbor 192.168.127.128 {
description "will flap a route until told otherwise";
router-id 198.111.227.39;
local-address 192.168.127.1;
local-as 65533;
peer-as 65533;
# add and remove routes when flap.sh prints
process loving-flaps {
run etc/processes/flap.sh;
}
}
BGP configuration
It is that simple
Success is a result, not a goal
Flaubert
5Friday, 22 July 11
Want simpler !!
neighbor 192.168.127.128 {
router-id 198.111.227.39;
local-address 192.168.127.1;
local-as 65533;
peer-as 65533;
process default-name-for-watchdog {
run etc/processes/monitor.sh;
}
static {
route 172.10.0.0/16 next-hop 192.0.2.1 watchdog service-one;
}
}
BGP configuration
6Friday, 22 July 11
Want Simpler ?
#!/bin/sh
trap '' SIGINT
while `true`;
do
state=`check-if-all-ok`
if [ “$state” = “up” ]; then
echo "announce watchdog service-one"
fi
if [ “$state” = “down” ]; then
echo "withdraw watchdog service-one”
fi
# pick its name from the process section name
echo “announce watchdog”
sleep 5
done
The watchdog ...
7Friday, 22 July 11
O"er usa#s ...
http://www.ukuug.org/events/spring2011/timetable/bgp.pdf
http://code.google.com/p/exabpg/
Get it ...
Judge a man by his questions rather than by his answers
Voltaire
Questions ?
Answer : yes, It works with flow routes too
8Friday, 22 July 11

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Control BGP from your applications

  • 1. Control BGP from your Applications Whatever a speaker is missing in depth he will compensate for in length Montesquieu LINX 74 - August 2011 Thomas Mangin Exa Networks 1Friday, 22 July 11
  • 2. Dynamically Change Routing DDOS filtering IWF interception Traffic engineering Suspend customers IP announcement .. AnyCast Control “cloud” IPs from a central location Active / Passive servers solution with service monitoring Why ? 2Friday, 22 July 11
  • 3. Permanent configuration generation 1 - Regenerating BIRD/Quagga/OpenBGPD configuration on change 2 - Getting the daemon to reload its configuration 3 - Go back to 1 There must be a better way ... OpenBGPD bgpctl BIRD birdc Quagga / Zebra telnet .. There must be a better way ...... How ? Logic will get you from A to B. Imagination will take you everywhere Albert Einstein 3Friday, 22 July 11
  • 4. 1 - take your favourite language : perl, python, lua, C, shell, french ! ... 2 - create a forever loop 3 - print what you want to do ... 4 - ... profit ? Demon!ration ! #!/bin/sh # ignore Control C trap '' SIGINT while `true`; do echo "announce route 192.0.2.1 next-hop 10.0.0.1" sleep 10 echo "withdraw route 192.0.2.1 next-hop 10.0.0.1" sleep 10 done flap.sh 4Friday, 22 July 11
  • 5. Integration neighbor 192.168.127.128 { description "will flap a route until told otherwise"; router-id 198.111.227.39; local-address 192.168.127.1; local-as 65533; peer-as 65533; # add and remove routes when flap.sh prints process loving-flaps { run etc/processes/flap.sh; } } BGP configuration It is that simple Success is a result, not a goal Flaubert 5Friday, 22 July 11
  • 6. Want simpler !! neighbor 192.168.127.128 { router-id 198.111.227.39; local-address 192.168.127.1; local-as 65533; peer-as 65533; process default-name-for-watchdog { run etc/processes/monitor.sh; } static { route 172.10.0.0/16 next-hop 192.0.2.1 watchdog service-one; } } BGP configuration 6Friday, 22 July 11
  • 7. Want Simpler ? #!/bin/sh trap '' SIGINT while `true`; do state=`check-if-all-ok` if [ “$state” = “up” ]; then echo "announce watchdog service-one" fi if [ “$state” = “down” ]; then echo "withdraw watchdog service-one” fi # pick its name from the process section name echo “announce watchdog” sleep 5 done The watchdog ... 7Friday, 22 July 11
  • 8. O"er usa#s ... http://www.ukuug.org/events/spring2011/timetable/bgp.pdf http://code.google.com/p/exabpg/ Get it ... Judge a man by his questions rather than by his answers Voltaire Questions ? Answer : yes, It works with flow routes too 8Friday, 22 July 11