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We can use ganglia to monitor metrics on servers, but it does not seem to be an option for network gear monitoring.

To monitor bandwidth of a switch, we need to either poll the port through SNMP protocol or somehow talk to sFlow/netflow agent running on the the switch/router. Any open source based option on the table? MRTG sounds a good out of box solution option, but I really wish I could use nagios or ganglia if possible because I am using them right now anyway (and I hope not to introduce another thing into the equation)

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closed as off-topic by Andrew Schulman, masegaloeh, mdpc, HBruijn, dawud Jun 10 '15 at 17:23

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Stanford has a curated list of resource they maintain slac.stanford.edu/xorg/nmtf/nmtf-tools.html – user292795 Jun 6 '15 at 21:07

have you try Cacti there is plugin for netflow (honestly i never use this plugin), maybe you want to take a look (http://gregsowell.com/?p=610)

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