Users Guide

Table Of Contents
Supported Releases 10.3.1E or later
mode l3
Enables L3 routing on a VLAN after you congure the VLAN scale prole.
Syntax
mode l3
Parameters None
Defaults Not congured
Command Mode INTERFACE VLAN
Usage Information To congure the VLAN scale prole, use the scale-profile vlan command. The scale prole globally applies
L2 mode on all VLANs you create and disables L3 transmission. To enable L3 routing trac on a VLAN, use the
mode L3 command.
Example
OS10(config)# interface vlan 10
OS10(conf-if-vl-10)# mode L3
Supported Releases 10.4.0E(X2) 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, from 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 L2 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 you
congure 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
NOTE: You must congure the MTU on VLAN members rst before you congure the VLAN
MTU.
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. If you congure the
MTU on VLAN members after you congure the VLAN MTU, the VLAN MTU may not be updated. OS10
selects the lowest MTU value congured on the VLAN or VLAN members to be the VLAN MTU.
Interfaces 251