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This class is intended for connected routes only, and supports only policytags being altered.
| RIBVarRW (IPRouteEntry<A>& route) | RIBVarRW | 
Parameters:
| route | route to filter and possibly modify. | 
| void  start_read () | start_read | 
Reimplemented from SingleVarRW.
| void  single_write (const string& id, const Element& e) | single_write | 
Write a variable.
Parameters:
| id | variablea to write. | 
| e | value of variable. | 
Reimplemented from SingleVarRW.