OS10 Enterprise Edition User Guide Release 10.4.0E(R3)

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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 (1280 to 65535). Maximum frame size for an S3000-ON is 12000, and S4000-ON is 9216.
Default
1532 bytes
Command Mode
INTERFACE
Usage Information

To return to the default MTU value, use the no mtu command. If an IP packet includes a Layer 2 header, the IP MTU must be at least 32 bytes smaller than the L2 MTU.

  • Port-channels
    • All members must have the same link MTU value and the same IP MTU value.
    • The port channel link MTU and IP MTU must be less than or equal to the link MTU and IP MTU values configured on the channel members. For example, if the members have a link MTU of 2100 and an IP MTU 2000, the port channel’s MTU values cannot be higher than 2100 for link MTU or 2000 bytes for IP MTU.
  • VLANS
    • All members of a VLAN must have same IP MTU value.
    • Members can have different link MTU values. Tagged members must have a link MTU 4 bytes higher than untagged members to account for the packet tag.
    • The VLAN link MTU and IP MTU must be less than or equal to the link MTU and IP MTU values configured on the VLAN members. For example, the VLAN contains tagged members with a 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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