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(Optional) Configuring the MTU
Context
The size of data packets is limited at the network
layer. Upon receiving an IP packet to be sent, the network layer checks
to which local interface the packet needs to be sent and obtains the
maximum transmission unit (MTU) configured on the interface. Then
the network layer compares the MTU with the packet length. If the
packet length is longer than the MTU, the network layer disassembles
the packet to fragments, each no longer than the MTU.
- If the MTU is too small whereas the packet size is large, the packet is split into many fragments. Therefore, the packet may be discarded due to insufficient QoS queue length.
- If the MTU is too large, packets are transmitted slowly or even lost.
Procedure
- Run system-view
The system view is displayed.
- Run interface cellular interface-number
The LTE cellular interface view or LTE channel interface view is displayed.
- Run mtu mtu
The MTU is configured for the LTE cellular interfaces or LTE channel interfaces.
By default, the MTU is 1500 bytes for the LTE cellular interfaces or LTE channel interfaces.