Restrictions for System MTU
On Cisco Catalyst 9600 Series Supervisor 2 Module (C9600X-SUP-2), the following restrictions are applicable:
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If no protocol-specific MTU configuration is present, Per-Port MTU is used as protocol-specific MTU. In case Per-Port MTU is not configured, System MTU is used as protocol-specific MTU.
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Ingress and egress Layer 2 MTU is derived from Per-Port MTU. If Per-Port MTU is not configured, System MTU is used
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On ingress ports configured with Layer 2 MTU, if packets exceed the configured MTU size, then the packets are dropped.
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Layer 2 MTU configurations are not enforced for egress frames.