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Catalyst 3750 Metro Switch Command Reference
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Chapter 2 Catalyst 3750 Metro Switch Cisco IOS Commands
mpls mtu
mpls mtu
Use the mpls mtu interface configuration command on an enhanced-services (ES) port to set the
per-interface maximum transmission unit (MTU) for multiprotocol label switching (MPLS) labeled
packets. Use the no form of this command to return to the default MTU setting.
mpls mtu bytes
no mpls mtu
Syntax Description
Defaults The system MTU is used if no MPLS MTU is configured.
Command Modes Interface configuration
Command History
Usage Guidelines If a labeled or nonlabeled IPv4 packet exceeds the MPLS MTU size for the interface, the packet is
dropped.
All devices on a physical medium must have the same MPLS MTU value for MPLS to operate between
the devices.
If the mpls mtu bytes command is not used to configure an interface MTU, the MTU for labeled packets
is the system MTU for the interface.
Because labeling a packet makes it larger, we recommend making the system MTU the same size as the
MPLS MTU to prevent dropping of labeled packets. We recommend using the system mtu routing
global configuration command to set a lower MTU value for the routing protocols.
Using the mpls mtu bytes command to change the MPLS MTU does not change the interface MTU.
Note See the Multiprotocol Label Switching on Cisco Routers feature module for more information about
configuring MPLS.
Examples This example shows how to set the maximum labeled packet size for a port to 3500 bytes:
Switch(config)# interface gigabitethernet1/1/1
Switch(config-if)# mpls mtu 3500
bytes The MTU value in bytes. The range is from 64 to 65536 bytes.
Release Modification
12.1(14)AX This command was introduced.
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