multi_controller_sdn

test mininet multi controller

project structure

multi_controller_sdn/
├─ topo/
│  └─ tiny_two_clusters.py
├─ controllers/
│  ├─ child/
│  │  └─ child_app.py
│  └─ master/
│     └─ master_app.py
├─ orchestrator/
│  ├─ orchestrator.py
│  └─ config.yaml
├─ scripts/
│  ├─ run_child_a.sh
│  ├─ run_child_b.sh
│  ├─ run_master.sh
│  └─ run_topo.sh
├─ tests/
│  └─ test_phase1.sh
├─ Makefile
└─ requirements.txt

Run to make scripts executeable

chmod +x scripts/*.sh

Kill old instances

sudo mn -c
pkill -f ryu-manager || true
sudo ovs-vsctl del-br s0 s1 s2 2>/dev/null || true

Start in 4 terminals (no sudo except Mininet)

T1 – Child-A (no sudo)

make childA

T2 – Child-B (no sudo)

make childB

T3 – Master (no sudo)

make master

T4 – Topology (Mininet needs sudo)

make topo

Ping Drops

if the very first pingall drops a few, run 'pingall' once more (ARP/learning). Because Your later pingall with 0% dropped is correct. The first run dropped because ARP + L2 learning hadn’t populated the tables yet. Once learned, everything’s green.

Run Validation Tests

Test Health

curl -s http://127.0.0.1:8080/health ; echo

curl -s http://127.0.0.1:8081/health ; echo

Global blocklist (deny hA1 -> hB1 TCP/80 on 10.0.0.0/24)

python3 orchestrator/orchestrator.py \
  push-blocklist --rule '{"src_ip":"10.0.0.1","dst_ip":"10.0.0.3","proto":"tcp","dport":80}'

Validate in Mininet (T4)

hB1 python3 -m http.server 80 &
hA1 curl -m 2 10.0.0.3:80   # should FAIL (blocked)
hA2 curl -m 2 10.0.0.3:80   # should SUCCEED (not blocked)

Test Failover Master Controller Takeover

Start up another Terminal (T5), to start slave controller monitoring

sudo python3 orchestrator/orchestrator.py monitor-failover

Then, stop childA (T1 using ctrl+c) then do pingall (it should still work) Restart childA Then rebind back

sudo python3 orchestrator/orchestrator.py rebind --to A --switches s1