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Configuring ACFC negotiation
About ACFC negotiation
PPP can compress the address and control fields of PPP packets to increase the payload size.
ACFC negotiation notifies the peer that the local end can receive packets carrying compressed
address and control fields.
ACFC negotiation is implemented at the LCP negotiation stage. After the ACFC negotiation
succeeds, PPP does not include the address and control fields in non-LCP packets. To ensure
successful LCP negotiation, PPP does not apply the compression to LCP packets.
Restrictions and guidelines for ACFC negotiation
As a best practice, use the ACFC configuration option on low-speed links.
Configuring the local end to send ACFC requests
1.
Enter system view.
system-view
2.
Enter interface view.
interface interface-type interface-number
3.
Configure the local end to send ACFC requests by including the ACFC option in outbound LCP
negotiation requests.
ppp acfc local request
By default, the local end does not include the ACFC option in outbound LCP negotiation
requests.
Configuring local end to reject ACFC requests received from the peer
1.
Enter system view.
system-view
2.
Enter interface view.
interface interface-type interface-number
3.
Configure the local end to reject ACFC requests received from the peer.
ppp acfc remote-reject
By default, the local end accepts the ACFC requests from the remote peer, and performs ACFC
on frames sent to the peer.
Configuring PFC negotiation
About PFC negotiation
PPP can compress the protocol field of PPP packets from 2 bytes to 1 byte to increase the payload
size.
PFC negotiation notifies the peer that the local end can receive packets with a single-byte protocol
field.
PFC negotiation is implemented at the LCP negotiation stage. After PFC negotiation is completed,
the device compresses the protocol field of sent non-LCP packets. If the first eight bits of the protocol
field are all zeros, the device does not add those bits into the packet. To ensure successful LCP
negotiation, PPP does not apply the compression to LCP packets.
Restrictions and guidelines for PFC negotiation
As a best practice, use this configuration option on low-speed links.