ECE 4110
Last lab assignment
Due Friday, Dec 3rd by 5pm
In this lab assignment, you will configure alternately RIP and OSPF and demonstrate dynamic
changes in routing between an Ethernet connection and a serial connection.
Using the configuration shown, traffic between hosts (not shown) on Ethernet 1 and hosts on
Ethernet 2 can be connected either directly through Router 1 (if Ethernet 1 is connected to router 1)
or through the serial link if routed that way by a failure of the Ethernet 1 to Router 1 connection.
You will simulate a failure by disconnecting Ethernet 1 from Router 1.
In calculating link throughput, keep in mind the three types of overhead:
1) overhead incurred by Ethernet headers,
2) overhead that occurs from PPP headers on the serial link.
3) overhead from TCP/UDP/IP headers.
In all of the following sections, use TCPDUMP to analyze the routing transactions seen on
Ethernet 1 and Ethernet 2.
Part 1: Configure the network to use RIP routing and 2 UDP traffic sessions, each at 70% of serial
link capacity for the total data flow (including headers, etc). Start with Ethernet 1 connected to
router 1, and disconnect router 1 from Ethernet 1, forcing a re-route. Plot packet throughput and
loss both slightly before the time that disconnect until the traffic flow restabilizes after RIP reroute
occurs. How long does it take for the reroute to occur?
Calculate both the raw throughput (ie, bits per second on each link) on all links involved, and
actual data throughput (data bytes transported), for both before and after the disconnect.
Part 2
Repeat part one using 2 TCP flows.
Part 3
Repeat part one using OSPF.
Part 4
Repeat part two using OSPF.
Router 1
Router 2
Ethernet 1
Ethernet 1 Ethernet 2
Serial Lin
k
