Version 2 (modified by, 9 years ago) (diff)


A Tutorial on Systematic Experimental Design

Step I: Single Node

Step II: Small Topology

Step III: Scaling Up

Image Map

3. End-to-End Validation

The RSpec file 4node-stitching.rspec is modified from 4node-final.rspec created in Step II, so all software has been installed to the slivers already. Open two terminals, and login to the client and server, respectively.

Run ping and traceroute from the client to the server

xuanliu@client:~$ ping
PING ( 56(84) bytes of data.
64 bytes from icmp_req=1 ttl=61 time=151 ms
64 bytes from icmp_req=2 ttl=61 time=75.8 ms
64 bytes from icmp_req=3 ttl=61 time=75.7 ms
64 bytes from icmp_req=4 ttl=61 time=75.9 ms
--- ping statistics ---
4 packets transmitted, 4 received, 0% packet loss, time 3004ms
rtt min/avg/max/mdev = 75.733/94.731/151.416/32.728 ms
xuanliu@client:~$ traceroute
traceroute to (, 30 hops max, 60 byte packets
 1  router-1-lan0 (  0.583 ms  0.595 ms  0.561 ms
 2  router-2-stitched0 (  38.909 ms  38.902 ms  38.865 ms
 3 (  75.354 ms  75.341 ms  75.301 ms
 4 (  75.501 ms  75.473 ms  75.432 ms

From the traceroute result, we found that the delay between the client and router-1, the delay between router-3 and the server were very small (about 0.5ms), this is because the end host and the associated router are from the same aggregate. However, the delay between router-1 and router-2 was about 38ms, and this reflected the delay between the aggregate located at Wisconsin and the aggregate located at New York City, and this shows the delay of the stitched link.

Scaling Up: Design/Setup

Scaling Up: Finish