# PCBDDCInterfaceExtType
Defines how interface balancing is extended into the interior of subdomains. 
## Synopsis
```
typedef enum {
  PC_BDDC_INTERFACE_EXT_DIRICHLET,
  PC_BDDC_INTERFACE_EXT_LUMP
} PCBDDCInterfaceExtType;
```



## Values

- ***`PC_BDDC_INTERFACE_EXT_DIRICHLET` -*** solves Dirichlet interior problem; this is the standard BDDC algorithm
- ***`PC_BDDC_INTERFACE_EXT_LUMP` -*** skips interior solve; sometimes called M_1 and associated with "lumped FETI-DP"



## Level
intermediate

## Location
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/include/petscpctypes.h.html#PCBDDCInterfaceExtType">include/petscpctypes.h</A>


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