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Cisco ASR 901 Aggregation Services Router Command Reference Guide
OL-26031-07
Chapter 1 CLI Command Reference
mtu
mtu
To adjust the maximum packet size or maximum transmission unit (MTU) size, use the
mtu
command
in interface configuration mode, connect configuration mode, or xconnect subinterface configuration
mode. To restore the MTU value to its original default value, use the
no
form of this command.
mtu
bytes
no mtu
Syntax Description
Command Default
Table 1-3
lists default MTU values according to media type.
Command Modes
Interface configuration (config-if)
Connect configuration (xconnect-conn-config)
xconnect subinterface configuration (config-if-xconn)
Command History
Usage Guidelines
Each interface has a default maximum packet size or MTU size. This number generally defaults to the
largest size possible for that interface type.
Note
The connect configuration mode is used only for Frame Relay Layer 2 interworking.
Changing the MTU Size
Changing the MTU size is not supported on a loopback interface.
bytes
MTU size, in bytes.
Table 1-3
Default Media MTU Values
Media Type
Default MTU (Bytes)
Ethernet
1500
Serial
1500
Token Ring
4464
ATM
4470
FDDI
4470
HSSI (HSA)
4470
Release
Modification
15.1(2)SNG
Support for this command was introduced on the Cisco ASR 901 router.