topic Best way to see broadcast AND multicast traffic utilization on 3800 switch in IMC

Best way to see broadcast AND multicast traffic utilization on 3800 switch

jacob600 — Wed, 24 Jan 2018 16:15:33 GMT

What's the best way to see broadcast AND multicast traffic utilization on 3800 switch? Real-time and historical?

I would like to see a report or graph that let's me know the numbers and %. Using the percent would be best so I can have an easy way to see if multi or broad is X % of traffic.

Thank you!

Re: Best way to see broadcast AND multicast traffic utilization on 3800 switch

Vince-Whirlwind — Thu, 25 Jan 2018 02:07:59 GMT

What monitoring tool are you using? Most of them should be able to create little pie charts showing utilisation by protocol for you.

One way I can quickly get an idea about how "noisy" a network is is to look at utilisation over time on a live switchport whose device isn't doing anything and see what the minimum Tx utilisation is. Eg, on a 2,000-device network that was all in one broadcast domain, I could see by looking at Tx stats on a "quiet" port that utilisation never went below 5Mbps, indicating that broadcast and multicast was running at about that (but peaking higher).

Re: Best way to see broadcast AND multicast traffic utilization on 3800 switch

marco_octavian — Thu, 25 Jan 2018 16:09:44 GMT

Best Option in my opinion

Short and Long term reporting using a Performance View (Resource -> Performance Management -> Performance View).

I would suggest adding the Performance View as a widget on the Home page and adding the Perfomance View you just created and also use thresholds.

Other options:

Switch Gui - short tem
cli - show int (more goodies here but not what you asked for..:)
IMC Report - Single Interface Traffic Summary Report - short and long
IMC widget - Port Group TopN - transmitting and receiving broadcasts
I'll create a blog post in the next few weeks since this question comes up quite often with my customers

HTH,

Marco Octavian