From: Petr Lapukhov (petr@internetworkexpert.com)
Date: Fri Sep 26 2008 - 11:46:46 ART
that's a tough question :) the command is hidden, and the feature is not
officially supported :) So far, i've seen it on most platforms, even on the
Catalyst 3550/3560 switches.
-- Petr Lapukhov, CCIE #16379 (R&S/Security/SP/Voice) petr@internetworkexpert.comInternetwork Expert, Inc. http://www.InternetworkExpert.com Toll Free: 877-224-8987 Outside US: 775-826-4344
2008/9/26, Lala Lander <sshafi@gmail.com>: > > 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 > > > > > > > > _______________________________________________________________________ > > > Subscription information may be found at: > > > http://www.groupstudy.com/list/CCIELab.html > > > > > > Blogs and organic groups at http://www.ccie.net > > > > _______________________________________________________________________ > > Subscription information may be found at: > > http://www.groupstudy.com/list/CCIELab.html > > > Blogs and organic groups at http://www.ccie.net > > _______________________________________________________________________ > Subscription information may be found at: > http://www.groupstudy.com/list/CCIELab.html
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