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. no connection to other branches

iv. multiple link down in device

v. device unreachable

b. No traffic

i. with MAC of CO, other branches and self

ii. with MAC of self only

iii. w/o MAC of CO, other branches and self

iv. w/o MAC of self only

c. Duplex mismatch

i. half-duplex on CO, other branches and self

ii. half-duplex on self only

iii. auto-negotiation on CO, other branches and self

iv. auto-negotiation on self only

d. Conflicting configuration

i. BW settings (input/output)

ii. storm control