Restrictions for Configuring Layer 3 Subinterfaces
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Subinterfaces are not supported on StackWise Virtual Link.
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Subinterfaces with Software-Defined Access (SD-Access) is not supported.
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Do not configure more than 4,000 Layer 3 interfaces, that includes routed physical interfaces, SVI interfaces and subinterfaces.
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A maximum of 1000 SVI interfaces is supported.
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Do not configure encapsulation on the native VLAN of an IEEE 802.1Q trunk without the native keyword. Always use the native keyword of the dot1q vlan command when the VLAN ID is the ID of the IEEE 802.1Q native VLAN.
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If you configure normal-range VLANs on subinterfaces, you cannot change the VLAN Trunking Protocol (VTP) mode from Transparent.
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If a Layer 3 port has a subinterface configured with dot1q as the native VLAN, Cisco recommends not to configure routing related configuration on the Layer 3 port as it will hinder the functionality of the native VLAN subinterface.
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The device supports only 1000 sub interfaces in one port. You can enable a Customizable Switch Device Manager (SDM) Template for 4K VLAN to configure 4000 sub interfaces in one physical port. In a Customizable SDM Template for 4K VLAN, you can increase the scale of VLAN from 1K to 4K.