How can I simulate 50% load on a point to point WAN circuit to measure the latency of a pre-determined SLA?

I just built a remote DMVPN RADIUS with an 300Mbps private point-to-point circuit to the data center.  My manager has promised an SLA of< 20ms="" at="" 50%="" bandwidth="" utilization="" (i="" think="" he="" made="" that="" up?!).=""  i'm="" trying="" to="" sort="" out="" the="" best="" way="" to="" test/document/baseline="" this="" statement="" for="" the="" customer.=""  my="" questions="">

Can how best I simulate a 50% load on the circuit? -My thoughts would be to set up some sort of maximum bandwidth QoS between 2 hosts and push then a large amount of traffic across the link and then average latency statistics ICMP to ping between the same two hosts.

Without going into too much detail, the remote site is using ASR1001 (DMVPN spoke) with tunnel interfaces ASR1002 worms (DMVPN hub).  3750 x at the access layer.

3750 x > mm fiber > asr1001 (speak) > 300Mbps circuit > 3750 x > asr1002 (hub) > l ' infrastructure.

Thanks in advance!

On the client side of Iperf use the-b option to specify the available bandwidth. [UDP]

I hope this helps.

See here:

http://OpenManiak.com/Iperf.php

UDP tests: (-u), bandwidth settings (-b)
Also see the section "Jperf.

UDP tests with the argument u will give valuable information on the jitter and packet loss. If you do not specify the argument - u, Iperf uses the TCP protocol.
To keep a good quality link, the packet loss should not go more than 1%. A high packet loss rates will generate a lot of retransmissions of TCP segment that will have an impact on bandwidth.

The Jig is basically the variation in latency and doesn't depend on the latency. You can have high response times and a very low jitter. The jitter value is especially important on network links supporting voice over IP (VoIP) as a high jitter can interrupt a call.
The argument-b allows the allocation if the desired bandwidth.

Client side:

10.1.1.1-c #iperf u b 10 m

------------------------------------------------------------
Client that connects to 10.1.1.1, port UDP 5001
Send datagrams 1470 bytes
The UDP buffer size: 108 KB (default value)
------------------------------------------------------------
[3] 10.6.2.5 local port 32781 connected with 10.1.1.1 port 5001
[3] 0, 0 - dry 10.0 11.8 MB 9.89 Mbps
[3] send datagrams 8409
[3] the server report:
[3] 0, 0 - dry 10.0 11.8 MB 9.86 Mbps 2,617 ms 9 / 8409 (0.11%)

Server-side:

#iperf s u-i 1

------------------------------------------------------------
Server that is listening on port UDP 5001
Receipt of datagrams 1470 bytes
The UDP buffer size: 8.00 KByte (default)
------------------------------------------------------------
[904] 10.1.1.1 local port 5001 connected with 10.6.2.5 port 32781
[ID] interval transfer band jitter bandwidth Total lost datagrams
[904] 0,0-1,0 s 1.17 Mbps ms 1,830 9.84 MB 0 / 837 (0%)
[904] 1.0-2.0 sec 1.18 MB 9.94 Mbps 1,846 ms 5 / 850 (0.59%)
[904] 2.0-3.0 s 1.19 MB 9.98 Mbps 1,802 ms 2 / 851 (0.24%)
[904] 3.0-4.0 sec 1.19 MB 10.0 Mbit/s ms 1,830 0 / 850 (0%)
[904] 4.0-5.0 sec 1.19 MB 9.98 Mbps 1,846 ms 1 / 850 (0.12%)
[904] 5.0-6.0 sec 1.19 MB 10.0 Mbps 1,806 ms 0 / 851 (0%)
[904] 6,0-7,0 sec 1.06 MB 8.87 Mbps 1,803 ms 1 / 755 (0.13%)
[904] 7.0-8.0 sec 1.19 MB 10.0 Mbit/s ms 1,831 0 / 850 (0%)
[904] 8.0-9.0 sec 1.19 MB 10.0 Mbps 1.841 ms 0 / 850 (0%)
[904] 9, 0-10, 0 sec 1.19 MB 10.0 ms 1,801 Mbits/sec 0 / 851 (0%)
[904] 0, 0 - dry 10.0 11.8 MB 9.86 Mbps 2,618 ms 9 / 8409 (0.11%)

Tags: Cisco Network

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