OpenRoads:SNMP

From OpenFlow Wiki

Contents 1 Installation and Setup 1.1 Development Machine 1.2 WiFi APs 1.3 Server

Installation and Setup

Development Machine

Install SNMP and its development libraries

sudo apt-get install snmp snmpd libsnmp-dev

Get the source code for SNMP support for OpenRoads

git clone git://gitosis.stanford.edu/openroads-wifi-snmp.git

Get the OpenFlow source code

git clone git://gitosis.stanford.edu/openflow.git

Compile the OpenFlow source to generate the OpenFlow library.

Get the OpenRoads NOX source code

git clone git://gitosis.stanford.edu/openroads.git noxcore

Make sure your snmp-wifi, openflow, noxcore are under the same directory, as shown below:

-./
---./snmp-wifi
---./openflow
---./noxcore 

Compile the source code in each of the sub-directories - snmp-wifi/server and snmp-wifi/ap-subagents - to get the binaries needed to run SNMP.

cd snmp-wifi/server; make
cd snmp-wifi/ap-subagents; make

Note that you need a 32-bit x86 machine (or an appropriate machine compatible with your AP) to compile the sources, so that the binaries can be copied over directly.

WiFi APs

The instructions in this section are to be carried out in the WiFi access point.

Install SNMP

apt-get install snmpd snmp

In /etc/default/snmpd, change

SNMPDOPTS='-Lsd -Lf /dev/null -u snmp -I -smux -p /var/run/snmpd.pid 127.0.0.1'

to

SNMPDOPTS='-x /var/agentx/master -Lsd -Lf /dev/null -u snmp -I -smux -p /var/run/snmpd.pid'

Copy configuration files and scripts from the development machine over to AP using the script snmp-wifi/copy-all2ap.sh

copy-all2ap.sh <username>@<ap's ip>

or do this manually as follows:

From snmp-wifi/config-files in the source (from git),

• Copy POMI-MOBILITY-MIB.txt to /usr/share/snmp/mibs/
• Add the following line to /usr/share/snmp/mibs/.index

POMI-MOBILITY-MIB POMI-MOBILITY-MIB.txt

• Copy snmpd.conf to /etc/snmp
  • This sample file assumes the SNMP manager runs in the host openroads.controller defined in /etc/hosts (described below).
• Copy openroads to /etc/init.d
  • Link it to /etc/rc2.d/ as S99 after noxbox

From snmp-wifi/ap-subagents in the source (from git),

• Copy wifi_subagent, trap_subagent and keepalive_subagent to /etc/snmp

Define the IP address of the controller as openroads.controller in /etc/hosts, e.g.,

127.0.0.1	openroads.controller

Restart SNMP daemon

/etc/init.d/snmpd restart

Make sure OpenFlow (of the appropriate version, i.e., the version the subagents are compiled with) is installed and running.

Now you can (re)start the subagents by executing

/etc/init.d/openroads [re]start

or manually by executing

/etc/snmp/trap_subagent -x /var/agentx/master
/etc/snmp/wifi_subagent -x /var/agentx/master
/etc/snmp/keepalive_subagent -x /var/agentx/master

Note: The source code assumes the OpenFlow WiFi interface name is ath0. If the interface name is different, change the definition of INTERFACE in snmp-wifi/ap-subagents/util.h appropriately

Server

The instructions in this section are to be carried out in the SNMP manager (typically, the OpenRoads controller)

Install SNMP

apt-get install snmpd

In /etc/default/snmpd, change

TRAPDRUN=no

to

TRAPDRUN=yes

From snmp-wifi/config-files in the source (from git),

• Copy POMI-MOBILITY-MIB.txt to /usr/share/snmp/mibs/
• Add filename POMI-MOBILITY-MIB.txt to /usr/share/snmp/mibs/.index
• Copy snmpd.conf, snmptrapd.conf and controllers.conf to /etc/snmp

From snmp-wifi/servers in the source (from git),

• Copy traphandler and keepalivehandler to /etc/snmp

Define the IP address of the controller as openroads.controller in /etc/hosts, e.g.,

127.0.0.1	openroads.controller

Specify NOX's SNMP-messenger's port in /etc/snmp/controllers.conf, e.g.,

127.0.0.1 2603

Restart SNMP daemon

/etc/init.d/snmpd restart

Run snmp-wifi/snmp_executor

./snmp_executor

Nikhil Handigol is the lead on the SNMP component for OpenRoads. Please contact him for any further questions.