Reference Guide

Usage Information
• The mode {FC | Eth} command congures a port group to operate at line rate and guarantees no trac
loss.
• The no version of the command resets port-group interfaces to the default Ethernet port mode/speed. Use
the
no mode command before you reset the mode on an interface.
• To congure oversubscription on a FC interface, use the speed command.
• To congure breakout interfaces on an Ethernet port, use the interface breakout command.
• To view the currently active ports and subports, use the show interfaces status command.
Example
OS10(conf-pg-1/1/2)# mode FC 16g-2x
OS10(conf-pg-1/1/8)# mode Eth 10g-4x
Example: Reset
mode
OS10(conf-pg-1/1/2)# mode FC 16g-2x
OS10(conf-pg-1/1/2)# no mode
OS10(conf-pg-1/1/2)# mode Eth 10g-4x
Supported Releases 10.3.1E or later
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
106 Interfaces