GVR: Task 3 - Fish Topology

Task Overview

Define the Controler Rules for the following topology flows/

Topology

 h1     h2
   \   /
    s1
     |
    r1
   /  \
 r6    r2
 |      |
 r5     r3
   \   /
     r4
     |
     h3

Network Configuration

just a suggestion you can do your own mapping

Device	Interface/Port	MAC Address	IP Address
h1	h1-eth0	aa:00:00:00:00:01	10.0.1.1/24
h2	h2-eth0	aa:00:00:00:00:02	10.0.1.2/24
h3	h3-eth0	aa:00:00:00:00:03	10.0.2.1/24
s1	s1-eth1 (to h1)	cc:00:00:00:01:01	N/A
s1	s1-eth2 (to h2)	cc:00:00:00:01:02	N/A
s1	s1-eth3 (to r1)	cc:00:00:00:01:03	N/A
r1	r1-eth1 (to s1)	aa:00:00:00:01:01	10.0.1.254/24
r1	r1-eth2 (to r2)	aa:00:00:00:01:02	10.0.12.2/24
r1	r1-eth3 (to r6)	aa:00:00:00:01:03	10.0.16.3/24
r2	r2-eth1 (to r1)	aa:00:00:00:02:01	10.0.12.1/24
r2	r2-eth2 (to r3)	aa:00:00:00:02:02	10.0.23.2/24
r3	r3-eth1 (to r2)	aa:00:00:00:03:01	10.0.23.1/24
r3	r3-eth2 (to r4)	aa:00:00:00:03:02	10.0.34.2/24
r4	r4-eth1 (to h3)	aa:00:00:00:04:01	10.0.2.254/24
r4	r4-eth2 (to r5)	aa:00:00:00:04:02	10.0.45.2/24
r4	r4-eth3 (to r3)	aa:00:00:00:04:03	10.0.43.3/24
r6	r6-eth1 (to r1)	aa:00:00:00:06:01	10.0.16.1/24
r6	r6-eth2 (to r5)	aa:00:00:00:06:02	10.0.56.2/24
r5	r5-eth1 (to r6)	aa:00:00:00:05:01	10.0.56.1/24
r5	r5-eth2 (to r4)	aa:00:00:00:05:02	10.0.45.3/24

Key Notes

• No P4 Code Changes Required: The provided P4 programs p4/l3switch.p4 and p4/l2switch.p4 remains the same.
• ARP Configuration: ARP tables and default routes for hosts are pre-configured by the Mininet script.
• Separate Flow Rules: Each P4 device requires its own set of flow rules.

Compile P4

p4c-bm2-ss --std p4-16  p4/l3switch.p4 -o json/l3switch.json
p4c-bm2-ss --std p4-16  p4/l2switch.p4 -o json/l2switch.json

Run

sudo python3 mininet/task3-topo.py --jsonR json/l3switch.json --jsonS json/l2switch.json

Load flow rules

simple_switch_CLI --thrift-port <r1_port> < flows/r1-flows.txt
simple_switch_CLI --thrift-port <r2_port> < flows/r2-flows.txt
...

Test

mininet> h1 ping h3 -c 5

Debugging Tips

Here are some useful commands to help troubleshoot and verify your topology:

1. Wireshark (Packet Capture)

2. ARP Table Inspection

• Command: arp -n
• Usage: Check the ARP table on any Mininet host to ensure proper IP-to-MAC Default gateway resolution.
• Example:

  mininet> h1 arp -n

3. Interface Information

• Command: ip link
• Usage: Display the state and configuration of network interfaces for each host or router.
• Example:

  mininet> r1 ip link

4. P4 Runtime Client for Monitoring

• Command: sudo ./tools/nanomsg_client.py --thrift-port <r1_port or r2_port>
• Usage: Interact with the P4 runtime to inspect flow tables and rules loaded on each router.
• Example:

  sudo ./tools/nanomsg_client.py --thrift-port 9090

These commands will help you inspect network traffic, verify ARP entries, check interface states, and interact directly with the P4 routers.