lac mss enable

Function

The lac mss enable command enables the Maximum Segment Size (MSS) of the virtual template on the LAC.

The undo lac mss enable command disables the MSS of the virtual template on the LAC.

By default, the MSS of the virtual template on the LAC is enabled.

This command is supported only on the NetEngine 8000 F1A.

Format

lac mss enable

undo lac mss enable

Parameters

None

Views

L2TP group view

Default Level

2: Configuration level

Task Name and Operations

Task Name	Operations
l2tp	write

Usage Guidelines

MSS refers to the maximum size of the data segment that can be transmitted each time by TCP. To implement the best transmission efficiency, TCP negotiates the MSS values of both ends before establishing the connection.

Usually, TCP calculates an MSS value by reference to the corresponding MTU value, because MSS equals the MTU minus 40 (20 bytes of the IP header and 20 bytes of the TCP header). Therefore, if the MTU is 1500 bytes, the MSS value is 1460 bytes. Note that both ends take the smaller MSS value provided by them as the MSS value of the connection.

Example

# Enable the MSS of the virtual template on the LAC.

<HUAWEI> system-view
[~HUAWEI] l2tp-group lac1
[*HUAWEI-l2tp-lac1] lac mss enable