tunnel dfbit enable

Use tunnel dfbit enable to set the Don't Fragment (DF) bit for tunneled packets.

Use undo tunnel dfbit enable to restore the default.

Syntax

tunnel dfbit enable

undo tunnel dfbit enable

Default

The DF bit is not set for tunneled packets.

Views

Tunnel interface view

Predefined user roles

network-admin

mdc-admin

Usage guidelines

To avoid fragmentation and delay, set the DF bit for tunneled packets. Make sure the path MTU is larger than the tunneled packet length. To avoid discarding tunneled packets whose length is larger than the path MTU, do not set the DF bit.

This command is not supported on a GRE/IPv6 tunnel interface and an IPv6 tunnel interface.

Examples

# Set the DF bit for tunneled packets on Tunnel 1.

<Sysname> system-view
[Sysname] interface tunnel 1 mode gre
[Sysname-Tunnel1] tunnel dfbit enable