Users Guide

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
congured 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 dierent 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 congured
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
port-group
Congures a group of front-panel unied ports, or a double-density QSFP28 (QSFP28-DD) or single-density QSFP28 port group.
Syntax
port-group node/slot/port-group
Parameters
• node/slot — Enter 1/1 for node/slot when you congure a port group.
• port-group — Enter the port-group number (1–16). The available port-group range depends on the switch.
Default Not congured
Command mode CONFIGURATION
Usage information Enter PORT-GROUP mode to:
• Congure unied ports in Fibre Channel or Ethernet mode and break out interfaces with a specied speed.
• Break out an MX9116n QSFP28-DD or QSFP28 port group into multiple interfaces with a specied speed.
To view the ports that belong to a port group, enter the show port-group command.
120 Interfaces