[c-nsp] RTR/SAA on smaller platforms

[Clinton Work]

Config is for a pair of 3550s running 12.1EA. The SAA probe will send 10 UDP 
probes per second using DSCP 40 for the entire hour. UDP probe interval is 
100ms and UDP payload is 160 bytes. The num-packets 590 tells SAA to send 
590 probes every 60 seconds spaced 100ms apart.

! Router B - Loopback0 is 192.168.2.100
conf t
rtr responder
end

! Router A - Loopback0 is 192.168.1.23
conf t
rtr 1
  type jitter dest-ipaddr 192.168.2.100 dest-port 16252 source-ipaddr 
192.168.1.23 interval 100 num-packets 590
  tos 0xA0
  threshold 100
  timeout 500
  request-data-size 160
  exit
rtr schedule 1 life 200000000 start-time now
end


Grab "show rtr collection" stats once an hour via the command line or via 
SNMP to check the results.

Command line:

successful probes = NumOfRTT
average latency = RTTSum / NumOfRTT

failed probes = PacketLossSD + PacketLossDS + PacketOutOfSequence + 
PacketMIA + PacketLateArrival

max jitter = max of ( MaxOfPositivesSD, MaxOfNegativesSD, MaxOfPositivesDS, 
  MaxOfNegativesDS  )

The jitter measurement is a rough estimate and is not done according to RFC 
1889 section A.8.


routera# show rtr collection 1
         Collected Statistics

Entry Number: 1
Target Address: 192.168.2.100, Port Number: 16252
Start Time: 00:42:47.000 pdt Thu Aug 10 2006
RTT Values:
NumOfRTT: 35397 RTTSum: 125736  RTTSum2: 460744
Packet Loss Values:
PacketLossSD: 0 PacketLossDS: 0
PacketOutOfSequence: 0  PacketMIA: 3    PacketLateArrival: 0
InternalError: 0        Busies: 0
Jitter Values:
NumOfJitterSamples: 35337
MinOfPositivesSD: 1     MaxOfPositivesSD: 13
NumOfPositivesSD: 3047  SumOfPositivesSD: 3117  Sum2PositivesSD: 3685
MinOfNegativesSD: 1     MaxOfNegativesSD: 13
NumOfNegativesSD: 3011  SumOfNegativesSD: 3073  Sum2NegativesSD: 3635
MinOfPositivesDS: 1     MaxOfPositivesDS: 13
NumOfPositivesDS: 4075  SumOfPositivesDS: 4181  Sum2PositivesDS: 5139
MinOfNegativesDS: 1     MaxOfNegativesDS: 14
NumOfNegativesDS: 4125  SumOfNegativesDS: 4237  Sum2NegativesDS: 5261
Interarrival jitterout: 0       Interarrival jitterin: 0        One Way Values:
NumOfOW: 4916
OWMinSD: 1      OWMaxSD: 4      OWSumSD: 10528  OWSum2SD: 25920
OWMinDS: 1      OWMaxDS: 7      OWSumDS: 7578   OWSum2DS: 14166



Jee Kay wrote:
> On 11/08/06, Clinton Work <clinton at scripty.com> wrote:
>> I have done a lot of SAA icmpecho and jitter probes on both the Cisco 
>> 1721
>> and Catalyst 3550 switches.  They work quite well and I haven't had any
>> issues. If you summarize the jitter statistics they can provide round 
>> trip
>> latency,max jitter, and packet loss with one test. The jitter probe does
>> require another Cisco device at the other end with "rtr responder" 
>> enabled.
> 
> Could you possibly provide some sample configurations for how you were
> doing this?
> 
> How were you collecting the results?
> 
> Thanks,
> Ras

-- 
===================================================
Clinton Work	clinton at scripty.com
Calgary, AB