From: Lala Lander (sshafi@gmail.com)
Date: Fri Sep 26 2008 - 10:48:43 ART
is ttcp available on all router platforms?
thanks
On Thu, Sep 25, 2008 at 3:48 PM, Bit Gossip <bit.gossip@chello.nl> wrote:
> 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
> >
> >
> > Blogs and organic groups at http://www.ccie.net
> >
> >
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