Cisco Cisco IOS Software Release 12.2(15)B

This document describes the ACFC and PFC Handling During PPP Negotiation feature and includes the 
following sections:

Using the High-level data link (HDLC) Address and Control Field Compression (ACFC) and PPP 
Protocol Field Compression (PFC) Handling During PPP Negotiation feature you can control the 
negotiation and application of the Link Control Protocol (LCP) configuration options for HDLC address 
and control field compression (ACFC) and for PPP protocol field compression (PFC). 

If ACFC is negotiated during PPP negotiation, Cisco routers may omit the HDLC header on links using 
HDLC encapsulation. If PFC is negotiated during PPP negotiation, Cisco routers may compress the PPP 
protocol field from two bytes to one byte. 

The PPP commands described in this document allow ACFC and PFC to be disabled during PPP 
negotiation, thus allowing the HDLC framing and the protocol field to remain uncompressed.

12.2(7)

This feature was introduced. 

12.2(15)B

This feature was integrated into Cisco IOS Release 12.2(15)B.