Switch MTU Configuration

Dashboard Location: Switching > Configure > Switch Settings > MTU

Maximum Transmission Unit Management

Switch MTU (Maximum Transmission Unit) configuration in Meraki networks provides administrators with the capability to optimize network frame sizes for enhanced performance, enabling jumbo frame support, reduced fragmentation overhead, improved throughput efficiency, and application-specific packet size optimization. This functionality supports network-wide MTU settings, device-specific overrides, profile-based configurations, and performance tuning for high-bandwidth applications. MTU configuration is essential for storage networks, virtualization environments, high-performance computing clusters, and enterprise applications requiring optimal network throughput.

Diagram

Classes

meraki

Name	Type	Constraint	Mandatory	Default Value
domains	List	domains	No

domains (meraki)

Name	Type	Constraint	Mandatory	Default Value
organizations	List	organizations	Yes

organizations (meraki.domains)

Name	Type	Constraint	Mandatory	Default Value
networks	List	networks	No

networks (meraki.domains.organizations)

Name	Type	Constraint	Mandatory	Default Value
switch	Class	switch	No

switch (meraki.domains.organizations.networks)

Name	Type	Constraint	Mandatory	Default Value
mtu	Class	mtu	No

mtu (meraki.domains.organizations.networks.switch)

Name	Type	Constraint	Mandatory	Default Value
default_mtu_size	Integer	min: 1, max: 9578	No
overrides	List	overrides	No

overrides (meraki.domains.organizations.networks.switch.mtu)

Name	Type	Constraint	Mandatory	Default Value
switches	List	String[min: 1, max: 127]	No
switch_profiles	List	String[min: 1, max: 127]	No
mtu_size	Integer	min: 1, max: 9578	Yes

Examples

Example-1: The example below demonstrates switch MTU configuration.

This configuration sets a default MTU of 9100 bytes on all Meraki switches, with optional overrides to assign custom MTU sizes (e.g., 1500 bytes) to specific switches or switch profiles for compatibility and optimized network performance.

meraki:
  domains:
    - name: !env domain
      administrator:
        name: !env org_admin
      organizations:
        - name: !env org
          networks:
            - name: !env network_name
              product_types:
                - appliance
                - switch
                - wireless
                - camera
                - sensor
                - cellularGateway
              switch:
                mtu:
                  default_mtu_size: 9100
                  # overrides:
                  #   - switches:
                  #       - !env core_switch_01_serial
                  #     mtu_size: 1500
                  #   - switch_profiles:
                  #       - Default
                  #     mtu_size: 1500