Nexus 9000 platform의 Uplink module은 Default 40G로 설정되어 있어, QSA module에 10G GBIC을 장착하더라도 port enable이 안됩니다.
Uplink module의 6port가 하나의 port-group으로 할당되어 있으며, 첫 번째 port의 speed를 정의하면 그 그룹의 모든 포트가 동일한 speed로 동작하게 됩니다.
[example]
Nexus93128의 경우 40G Port를 8개까지 사용할 수 있는데, 이 경우 1~6 / 7~8 2개의 group으로 사용할 수 있습니다.
[document 발췌]
The Cisco QSFP+ to SFP+ Adapter (QSA) module provides 10G support for the 40G uplink ports that are a part of the Cisco Nexus M12PQ uplink module of the Cisco Nexus 9396PX (N9K-C9396PX) and Cisco Nexus 93128TX (N9K-C93128TX) devices.
A group of six consecutive ports in the M12PQ uplink module must be operating at the same speed (40G or 10G) to use the QSA/QSFP modules.
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For Cisco Nexus 9396PX devices, 2/1-6 ports form the first port speed group and the remaining 2/7-12 ports form the second port speed group.
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For Cisco Nexus 93128TX devices, 2/1-6 ports form the first port speed group and the remaining 2/7-8 ports form the second port speed group.
Use the speed-group 10000 command to configure the first port of a port speed group for the QSA. This command specifies the administrator speed preference for the port group. (The default port speed is 40G.)
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The speed-group 10000 command specifies a speed of 10G.
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The no speed-group 10000 command specifies a speed of 40G.
After the speed has been configured, the compatible transceiver modules are enabled. The remaining transceiver modules in the port group (incompatible transceiver modules) become error disabled with a reason of "check speed-group config".
QSA Configuration Example
For a Cisco Nexus 9396PX:
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Using the default configuration on port 2/1, all the QSFPs in port group 2/1-6 are brought up with a speed of 40G. If there are any QSA modules in port group 2/1-6, they are error disabled.
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Using the speed-group 10000 command to configure port 2/7, all the QSAs in port group 2/7-12 are brought up with a speed of 10G. If there are any QSFP modules in port group 2/7-12, they are error disabled
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