# mask source

#### Syntax

mask source sourceMinimumSize

no mask source

#### Release Information

Command introduced in JunosE Release 8.1.0.

#### Description

Sets the minimum mask size for the source address for the prefix and source prefix aggregation caches. The no version restores the default mask size.

#### Options

- sourceMinimumSize—Mask number in the range 1—32; default is 0

#### Mode

Flow Cache Configuration