ipv4 fragment enable

Function

The ipv4 fragment enable command enables fragmentation for outgoing forwarding-plain IP packets.

The undo ipv4 fragment enable command disables fragmentation for outgoing forwarding-plain IP packets.

By default, fragmentation for outgoing forwarding-plain IP packets is disabled.

Only the S5720-HI, S5730-HI, S5731-H, S5731-S, S5731S-H, S5731S-S, S5732-H, S6720-HI, S6730-H, S6730S-H, S6730-S, and S6730S-S support this command.

Format

ipv4 fragment enable

undo ipv4 fragment enable

Parameters

None

Views

System view

Default Level

2: Configuration level

Usage Guidelines

Usage Scenario

By default, only packets on the control plane can be fragmented according to the MTU on an interface. Packets on the forwarding plane can be forwarded normally without limited by the MTU. When the remote device or intermediate forwarding device receives IP packets, if it checks the packet length and discards packets whose length is longer than the MTU on the interface, network communication is interrupted. For the S5720-HI, S5730-HI, S5731-H, S5731-S, S5731S-H, S5731S-S, S5732-H, S6720-HI, S6730-H, S6730S-H, S6730-S, and S6730S-S, you can run the ipv4 fragment enable command to enable fragmentation for outgoing forwarding-plane IP packets so that packets on the forwarding plane are fragmented based on the MTU on the interface.

Precautions

Before configuring the ipv4 fragment enable command, set a proper MTU. If the MTU is small, there may be many fragments of IP packets, causing the Layer 3 forwarding performance of IP packets to deteriorate.

Example

# Enable fragmentation for outgoing IP packets.

<HUAWEI> system-view
[HUAWEI] ipv4 fragment enable