05-17-2022 07:56 AM
Question on ISR 4321, right now our device is setup for 100000 kb/s throughput, however when testing iperf on our private WAN connection (which is 100mb/s) we are only getting 42mbps. We are likely hitting a throughput limit on this device? Topology is
Server(iperf)-->switch-->ISR-->WAN MPLS--->ASR-->Switch-->Server (iperf)
Solved! Go to Solution.
12-11-2022 11:32 AM
Boost performance license resolved this issue on 4321
Index 11 Feature: booster_performance
05-17-2022 08:51 AM - edited 05-17-2022 08:58 AM
100000 kb/s throughput - Do you mean you have 100 Mbps performance license?
Same performance, both directions?
Are you testing throughput in just one direction, or both directions, at the same time?
For iPerf, are you bandwidth testing using TCP or UDP?
WAN handoffs are FE or gig?
IPerf reporting any lost packets?
05-17-2022 10:53 AM
WAN handoff is Gig, using iperf tcp and yes I used the -R switch to check iperf in reverse direction. I am not sure if iperf is dual or single stream. Pretty sure its single stream. Either transmit or receiving I am only getting 42mbps
05-17-2022 11:18 AM - edited 05-17-2022 11:36 AM
To insure I understand, your WAN is a gig physical hand-off with a logical 100 Mbps cap?
05-17-2022 11:41 AM
Correct gig ethernet handoff and 100mbps through provider cap.
05-17-2022 12:24 PM
Then it's possible, gig bursts are being dropped by your provider, which will slow TCP transmission rate.
That noted, I wouldn't expect such an impact to drive your rate to 42 Mbps; further, the 4321 should enforce its cap by shaping (BTW, the 4321 cap is applied to all traffic flowing through the router, so when doing these tests, check the aggregate throughput of all interfaces, ingress or egress (but not both, together).
Also try (if iPerf supports), unidirectional bandwidth tests, using UDP, at different "fixed" data rates, including over 100 Mbps, and "see" what rate you get on the far side.
12-11-2022 11:32 AM
Boost performance license resolved this issue on 4321
Index 11 Feature: booster_performance
12-11-2022 02:33 PM
Interesting! Although, still leaves the "mystery" why you didn't get your original licensed throughput.
Thanks for the follow-up.
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