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 self

ii. on self only

iii. multiple link down in device

iv. device unreachable

b. No traffic

i. with MAC on both CO and branch

ii. with MAC on branch only

iii. w/o MAC on both CO and branch

iv. w/o MAC on branch only

c. Duplex mismatch

i. half-duplex on both CO and branch

ii. half-duplex on branch only

iii. auto-negotiation on both CO and branch

iv. auto-negotiation on branch only

d. Conflicting configuration

i. BW settings (input/output)

ii. storm control