100-Ge Qsfp28 Fiber Port Fails To Come Up; Symptom; Troubleshooting Flowchart; Solution - H3C S12500G-AF Series Troubleshooting Manual

IMPORTANT:
If a QSFP+ to SFP+ cable is used, use an optical attenuator to make sure the Tx power of the
QSFP+ module stays below the Rx power of the SFP+ module.
3. Verify that the fiber matches the transceiver module. If they do not match, replace the fiber with
a new one that matches the transceiver module.
4. If the issue persists, contact H3C Support.

100-GE QSFP28 fiber port fails to come up

Symptom

A 100-GE QSFP28 fiber port fails to come up.

Troubleshooting flowchart

Figure 13 Troubleshooting link up failure on a port
A port failed to come up
Local/peer port
operating correctly?
Yes
Transceiver
module/cable correct?
Yes
Fiber correct?
Yes
Contact the support

Solution

To resolve the issue:
1. Verify that the local and peer ports are operating correctly:
Use a QSFP28 cable to connect the local port directly to another 100-GE QSFP28 fiber port on
the same card.
If the local port can come up, replace the peer port with a new one (on a card of the same

type, if possible).
No
Replace local/peer port
No
Replace transceiver
module/cable
No
Replace fiber
48
Yes
Resolved?
No
Yes
Resolved?
No
Yes
Resolved?
No
End