2. Check port status, type, logs, traffic, duplex and running config

a. Cisco

b. Huawei

c. RAD ETS

d. MRV

3. Check if MAC address is detected in both client’s port and device uplink (both sites)

4. Begin troubleshooting when issue has been detected

a. Link down

i. both CO and branch

ii. on branch only

iii. multiple link down in device

iv. device unreachable

b. No traffic

i. with MAC on both sites

ii. with MAC on one site only

iii. w/o MAC on both sites

iv. w/o MAC on one site only

c. Duplex mismatch

i. half-duplex on both sites

ii. half-duplex on one site only

iii. auto-negotiation on both sites

iv. auto-negotiation on one site only

d. Conflicting configuration

i. BW settings (input/output)

ii. storm control