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Configuring Port Breakout And Aggregation On The Cisco Catalyst 9500X Switch

Time: 2025-09-05
        We have previously introduced the configuration of interface breakout and aggregation for multiple Cisco Nexus series switches. This article uses the Cisco C9500X-60L4D switch (IOS XE Version: 17.14.01) as the test model to explain how to configure QSFP interface breakout and aggregation on Cisco Catalyst 9500X series switches.
        1. By default, QSFP interfaces run in aggregation mode. When checking interface status, only one standalone interface is displayed. The interface speed defaults to auto and can be configured to 40G, 100G, 200G or 400G.
        2. Enter global configuration mode and run the following command:
            hw-module breakout <port_number>
        This command splits aggregated QSFP interfaces. No additional breakout mode selection is required; the interface automatically negotiates speed according to the inserted optical module. The command takes effect immediately after execution.
        This switch series has certain restrictions when configuring interface breakout or aggregation modes, including software version requirements and quantity limits for odd/even 100G interfaces. For detailed rules, refer to Cisco’s official interface and hardware configuration guide corresponding to the software version.
9500X Interface Breakout Restrictions
Figure 1 9500X Interface Breakout Restrictions
        3. After configuring interface breakout, check the interface status. The original standalone physical interface will be disabled, and four new sub-interfaces will be generated.
        4. Enter global configuration mode and execute the following command to disable interface breakout:
            no hw-module breakout <port_number>
        The interface will revert to the device’s default aggregation state.
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