The QSFP Port (S-Series)

QSFP ports support operation as a 1x40G port or 4x10G ports on the S-Series platform.

QSFP port speeds operate in port speed group pairs. For a six QSFP module, there are three port speed group pairs:

• Port Speed Group 1 – ports 1 and 2
• Port Speed Group 2 – ports 3 and 4
• Port Speed Group 3 – ports 5 and 6

All ports in a speed group must be set to the same speed.

Port speed groups can operate in either 40Gbps or 10Gbps mode. A 40Gbps port is identified using the fg.x.y format where x identifies the chassis slot and y identifies the module port. A 10Gbps port is identified using the tg.x.y format.

When displaying ports on the QSFP card, all possible ports are displayed in show command output. For a six QSFP module, ports fg.x.1-6 and tg.x.1-24 (four 10Gbps ports for each of six 40Gbps ports) are displayed. The ports not associated with the active operating speed are displayed with an oper-status of not-present. For example, if port speed group one made up of fg.1.1-2 and tg.1.1-8 is running in 40Gbps mode, the display will show ports tg.1.1-8 as not-present.

Note

A module must be reset when modifying the port speed of a QSFP port for the new speed to become operational.

Many QSFP devices support operation in both 10Gbps and 40Gbps.These include QSFP assemblies with fixed cable assemblies that have QSFP terminations at both ends of the assembly.

At this time of this writing, only the QSFP to 4x SFPP “hydra” cable assemblies, which terminate one end with a SFPP, and QSFP to single SFPP adapters must operate in 10Gbps.

If optical QSFP transceivers with detachable fiber cable are to be used, they must be Extreme Networks brand. See the release notes that come with your firmware version for QSFP transceiver support details.