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Dell SmartFabric OS10 User Guide Release 10.5.3

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mtu

Sets the link maximum transmission unit (MTU) frame size for an Ethernet L2 or L3 interface.

Syntax
mtu value
Parameters
value — Enter the maximum frame size in bytes, from 1280 to 65535. Maximum frame size for an S3000-ON is 12000, and S4000-ON is 9216.
Default
1532 bytes (or the value that is configured using the default mtu command)
Command Mode
INTERFACE
Usage Information

To return to the default MTU value, use the no mtu command. If an IP packet includes a L2 header, the IP MTU must be at least 32 bytes smaller than the L2 MTU.

  • Port channels: Member interfaces inherit the MTU value configured on the port-channel interface.
  • VLANS:
    • All members of a VLAN must have the same MTU value.
    • Tagged members must have a link MTU 4 bytes higher than untagged members to account for the packet tag.
    • Ensure that the MTU of VLAN members is greater than or equal to the VLAN MTU. OS10 selects the lowest MTU value configured on the VLAN or VLAN members to be the VLAN MTU.

    For example, the VLAN contains tagged members with Link MTU of 1522 and IP MTU of 1500 and untagged members with Link MTU of 1518 and IP MTU of 1500. The VLAN’s Link MTU cannot be higher than 1518 bytes and its IP MTU cannot be higher than 1500 bytes.

Example
OS10(conf-if-eth1/1/7)# mtu 3000
Supported Releases
10.2.0E or later

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