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How To Configure Interface Breakout And Aggregation On The Cisco NCS 540 Switch

Time: 2025-08-07
        We previously introduced interface breakout and aggregation configurations for Cisco Nexus series switches. This article uses the N540-ACC-SYS switch as a test model to demonstrate how to configure QSFP interface breakout and aggregation on the Cisco NCS 540 switch.
        1. By default, QSFP interfaces operate in aggregation mode. Only one standalone interface is visible when checking interfaces, with a default speed of 100G (which can be manually configured to 40G).
        2. Enter global configuration mode, then access the optics controller interface using the command:
            controller optics <port_number>
        Next, execute the breakout configuration command:
            breakout <breakout_mode>
        This command splits the aggregated QSFP interface. Save the configuration for the settings to take effect.
        3. After completing the breakout configuration, check the interface list. The original single interface (100G or 40G) will be split into four independent 10G interfaces, and the interface naming format will change accordingly.
        4. To cancel interface breakout and restore aggregation mode, use one of the following two methods:
            • In the optics controller interface configuration mode, run the command:
              no breakout <breakout_mode>
            • Reconfigure the interface mode to 1x40 (40G) or 1x100 (100G) using the command sequence in Step 2.
        After either operation, the interface will revert to the device’s default aggregation state.
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