Copyright Notice: Copyright by CMPUT 379, U. of Alberta, course instructor (E. Elmallah). All rights reserved. Do not post any part on a publicly-available Web site.
Example 1. This example gives a sample output of the info command when executed from both the master switch and a packet switch. Here, we open two terminal windows on the same lab workstation. On the first window, we invoke a2w22 as a master switch. On the second window, we invoke a2w22 as a packet switch, as described in the data file below:
# Data file for a2w22
# a2w22 master 1
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# a2w22 psw1 ex1.dat null null 100-110
psw1 100 102
psw2 200 300
psw3 200 300
psw1 100 103
psw1 100 104
Sample output (edited for clarity):
• An info command to the master switch produces the following output: Switch information:
[psw1] port1= -1, port2= -1, port3= 100-110
Packet Stats:
Received: HELLO:1, ASK:0
Transmitted: HELLO_ACK:1, ADD:0
Here,port= -1referstothenullconnectionofaport.
• An info command to packet switch psw1 produces the following output:
Forwarding table:
[0] (srcIP= 0-1000, destIP= 100-110, action= FORWARD:3, pktCount= 3)
Packet Stats:
Received: ADMIT:3, HELLO_ACK:1, ADD:0, RELAYIN:0
Transmitted: HELLO:1, ASK:0, RELAYOUT:0
Here, the switch did not ask the master switch since all admitted packets are handled by the initial rule installed by the switch.
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