Dell C1048P Port Extender Networking Configuration Guide for the C9000 Series - Page 445

NOTE: Trident2 chip sets do not work at 1G speeds with auto-negotiation enabled. As a result, when you peer any device using SFP, the link does not come up if auto-negotiation is enabled. Therefore, you must disable auto-negotiation on platforms that currently use Trident2 chip sets (9000 series). This limitation applies only when you convert QSFP to SFP using the QSA. This constraint does not apply for QSFP to SFP+ conversions using the QSA. Important Points to Remember • Before using the QSA to convert a 40 Gigabit Ethernet port to a 10 Gigabit SFP or SFP+ port, you must enable 40 G to 4*10 fan-out mode on the device. • When you insert a QSA into a 40 Gigabit port, you can use only the first 10 Gigabit port in the fan-out mode to plug-in SFP or SFP+ cables. The remaining three 10 Gigabit ports are perceived to be in Link Down state and are unusable. • You cannot use QSFP optical cables in a QSA setup. • When you remove the QSA module alone from a 40 Gigabit port, without connecting any SFP or SFP+ cables; Dell Networking OS does not generate any event. However, when you remove a QSA module that has SFP or SFP+ optical cables plugged in, Dell Networking OS generates a SFP or SFP+ Removed event. • You can use the QSA on any of the ports. However, the existing maximum fan-out restrictions apply to the ports. • The QSA module does not have a designated EEPROM. To recognize a QSA, Dell Networking OS reads the EEPROM corresponding to a SFP+ or SFP module that is plugged into QSA. The access location of this EEPROM is different from the EEPROM location of the QSFP+ module. • The diagnostics application is capable of detecting insertion or removal of both the QSA as well as the SFP+ or SFP optical cables plugged into the QSA. In addition, the diagnostic application is also capable of reading the DDS and Vendor information from the EEPROM corresponding to SFP+ or SFP optical cables. As a result, no separate detection of QSA is required. Support for LM4 Optics The newly supported LM4 optics are similar in behavior to the LR4 optics that are already supported. However, in the output of show inventory media command, an LM4 optical module is denoted as 40G-LM4. Barring this exception, the functionality and behavior of LM4 optics is similar to LR4 optics. Example Scenarios Consider the following scenarios: • QSFP port 0 is connected to a QSA with SFP+ optical cables plugged in. • QSFP port 4 is connected to a QSA with SFP optical cables plugged in. • QSFP port 8 in fanned-out mode is plugged in with QSFP optical cables. • QSFP port 12 in 40 G mode is plugged in with QSFP optical cables. Configuring wavelength for 10-Gigabit SFP+ optics You can set the wavelength for tunable 10-Gigabit SFP+ optics using the wavelength command. To set the wavelength, follow these steps: • Enter the interface mode and set the wavelength. INTERFACE mode wavelength 1529.0 The wavelength range is from 1528.3 nm to 1568.77nm. • Verify configuration changes. INTERFACE mode Interfaces 445