Alcatel-Lucent 060321-10, Rev. B, Cli Reference Manual

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vlan mtu-ip VLAN Management Commands
page 4-8 OmniSwitch CLI Reference Guide March 2011
vlan mtu-ip
Configures the maximum transmission unit (MTU) packet size allowed for all ports associated with a
VLAN. This value is configured on a per VLAN basis, so all IP interfaces assigned to the VLAN apply the
same MTU value to packets sent on VLAN ports.
vlan vlan_id mtu-ip size
Syntax Definitions
vlan_id An existing VLAN ID number of the VLAN to assign as the default
VLAN configured for the port.
size Packet size value specified in bytes.
Defaults
By default, the MTU size is set to 1500 bytes (the standard Ethernet MTU size).
Platforms Supported
OmniSwitch 10K
Usage Guidelines
•
The MTU size applies to traffic sent on all switch ports that are associated with the specified VLAN
regardless of the port speed (for example, 10/100 Ethernet, gigabit Ethernet). Therefore, assign only
ports that are capable of handling the MTU size restriction to the VLAN. If the VLAN MTU size is
greater than 1500, do not assign 10/100 Ethernet ports to the VLAN.
•
By default, packets that exceed the MTU size are dropped. To enable MTU discovery and
fragmentation, use the
icmp type command to enable the “frag needed but DF bit set” control (for
example, icmp type 3 code 4 enable ).
•
The maximum MTU size value for a Multi-chassis MCM-IPC VLAN its 9198.
Examples
-> vlan 200 mtu-ip 1000
-> vlan 1503 mtu-ip 9198
Release History
Release 7.1.1; command introduced.