map ipv6 df-override enable

Function

The map ipv6 df-override enable command enables a device to set the DF field to 0.

The undo map ipv6 df-override enable command disables a device from setting the DF field to 0.

This function is disabled by default.

This command is supported only on the NetEngine 8000 F1A.

map ipv6 df-override enable

undo map ipv6 df-override enable

None

MAP-T instance view

2: Configuration level

Task Name	Operations
map	write

To enable a device to set the DF field to 0, run the map ipv6 df-override enable command in the MAP-T instance view.

The device is enabled to set the DF field to 0 for IPv4 packets after IPv6 packets are converted to IPv4 packets.

When this function is disabled and IPv6 packets are converted to IPv4 packets, the implementation is as follows:

If IPv6 packets are less than or equal to 1280 bytes and have no fragment extension header, the device sets the DF field to 0 in IPv4 packets.
If IPv6 packets are greater than 1280 bytes and have no fragment extension header, the device sets the DF field to 1 in IPv4 packets.
If IPv6 packets have fragment extension headers, the device sets the DF field to 0 in IPv4 packets.

# Create a MAP-T instance named test in the system view, access the MAP-T instance view, and enable the device to set the DF field to 0.

<HUAWEI> system-view
[~HUAWEI] map-t instance test id 111
[*HUAWEI-mapt-instance-test] map ipv6 df-override enable