From: Bit Gossip (bit.gossip@chello.nl)
Date: Thu Sep 25 2008 - 19:48:22 ART
Thank you very much Petr!
With the 'control disable' option it really works as a traffic generator
Bit.
On Thu, 2008-09-25 at 13:18 +0400, Petr Lapukhov wrote:
> First of all, you're trying to send packets to a broadcast IP address.
> However, by default, IP SLA operation tries to establish a control
> connection on a specific UDP port with the destination IP. So make
> sure you specified "control disable" keyword. This will switch your IP
> SLA operation to pure "traffic generator".
>
>
> If you want to generate a packet stream of certain rate with IP SLA
> UDP Jitter opertation, use the following information.
>
>
> "interval" is the "inter-packet" gap that IP SLA uses to emit packets
> "frequency" is how often the operation generates traffic bursts
> (groups of packets)
> "request-data-size" the amount of payload (does not account for
> L3/L2/L1 overhead!) sent in every packet
> "num-packets" number of packets sent every "frequency" seconds
>
>
> It is usually convenient to set "frequency" to 1 second and "interval"
> to 1ms. Thus you may regulate the require packet per second rate (e.g.
> 100 packets per second) and obtain bits per second value based on the
> formula:
>
>
> bps = num-packets*(request-data-size+L3 overhead + L2 overhead)*8 (the
> formula is aproximate, for inter-packet delay is 1ms, not zero!)
>
>
> Just make sure it takes less than a second to serialize the packet
> burst across the output interface :)
>
>
> Aside from using IP SLA as traffic generator, you may use the followig
> methods to produce controlled packet flows:
>
>
> 1) Generate a flood of ICMP packets (timeout = 0) and configure a
> traffic-shaper (GTS/CBTS) to format the stream to desired parameters
> (rate, burst)
> 2) Use the hidden "ttcp" command for traffic generation and
> thoroughput measurements
>
>
> http://www.cisco.com/en/US/tech/tk801/tk36/technologies_tech_note09186a0080094694.shtml
>
>
>
> HTH
> --
> Petr Lapukhov, CCIE #16379 (R&S/Security/SP/Voice)
> petr@internetworkexpert.com
>
> Internetwork Expert, Inc.
> http://www.InternetworkExpert.com
> Toll Free: 877-224-8987
> Outside US: 775-826-4344
>
>
> 2008/9/25 Bit Gossip <bit.gossip@chello.nl>
> Dear group,
> I was trying to use ip-sla as traffic generator but I can get
> only
> marginal amount of traffic no matter what I set in the
> num-packets: in
> the example attached I configured num-packets 10000 but only a
> couple
> seem to be sent for real, the remaining being skipped.
> I am using dynamips, may this be the reason?
> Thanks,
> Bit.
>
> R0#show running-config | s ip sla
> ip sla 10
> udp-jitter 192.168.255.255 20000 num-packets 10000 interval 4
> frequency 206
> ip sla schedule 10 life forever start-time now
>
> R0#show ip sla statistics 10 details
> IPSLAs Latest Operation Statistics
>
> IPSLA operation id: 10
> Latest RTT: 5 milliseconds
> Latest operation start time: *22:33:28.611 UTC Wed Sep 24 2008
> Latest operation return code: OK
> RTT Values:
> Number Of RTT: 2 RTT Min/Avg/Max: 4/5/7
> milliseconds
> Latency one-way time:
> Number of Latency one-way Samples: 0
> Source to Destination Latency one way Min/Avg/Max:
> 0/0/0
> milliseconds
> Destination to Source Latency one way Min/Avg/Max:
> 0/0/0
> milliseconds
> Source to Destination Latency one way Sum/Sum2: 0/0
> Destination to Source Latency one way Sum/Sum2: 0/0
> Jitter Time:
> Number of SD Jitter Samples: 1
> Number of DS Jitter Samples: 1
> Source to Destination Jitter Min/Avg/Max: 0/0/0
> milliseconds
> Destination to Source Jitter Min/Avg/Max: 3/3/3
> milliseconds
> Source to destination positive jitter Min/Avg/Max:
> 0/0/0
> <...>
> Interarrival jitterin: 0
> Over thresholds occurred: FALSE
> Packet Loss Values:
> Loss Source to Destination: 0 Loss
> Destination to
> Source:
> 0
> Out Of Sequence: 0 Tail Drop: 0 Packet Late
> Arrival: 0
> Packet Skipped: 9998
> <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
> Voice Score Values:
> Calculated Planning Impairment Factor (ICPIF): 0
> Mean Opinion Score (MOS): 0
> Number of successes: 4
> Number of failures: 0
>
>
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