All configuration files are in testbed-conf/conf.
First, you need to log in 4 switches (ToR 1, ToR 2, Core 1 and Core 2) to configure routing table and ECN. ToR 1, ToR 2, Core 1 and Core 2 can be accessed from sing040, sing041, sing042 and sing043, respectively. To access the switch, please use screen /dev/ttyS1 115200. To restart the switch, input Ctrl + D and then choose Utility -> Reboot.
Then, you need to log in sing040 - sing51 (12 hosts in total) to configure IP addresses, routing table and ARP table. The configuration commands are shown in testbed-conf/conf/end_host.txt