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#A ppp frame includes fcs software
#A ppp frame includes fcs iso

At random intervals the authenticator sends a new challenge to the peer and repeats steps 1 through 3.

If the values matches, the authenticator acknowledges the authentication otherwise it should terminate the connection.

The authenticator checks the response against its own calculation of the expected hash value.

The peer responds with a value calculated using a one-way hash function on the challenge and the secret combined.

After the completion of the link establishment phase, the authenticator sends a “challenge” message to the peer.

The protocol field has a value of C023 (hex).

Server sends authentication-ack (if credentials are OK) or authentication-nak (otherwise).

Ip tcp headercompression and ip rtp header-compression : use IPCP to initiate compression (or wait if passive).Īlternative method using an MQC policy map to create classbased header compression. It does this by saving the state of TCP connections at both ends of a link, and only sending the differences in the header fields that change. TCP header compression compresses the combined IP and TCP headers, a combined With G.729 in use, RTP header compression reduces the required bandwidth by RTP header compression compresses the IP/UDP/RTP headers (40 bytes) into 2 Supports ATM and ATM-to-Frame Relay Service Interworking (using MLP)? Once compression is configured (matching compress command), PPP starts the Compression Control Protocol (CCP), which is another NCP, to perform the compression negotiations and manage the compression process. LZ uses more CPU and less memory in comparison to Predictor, and LZ typically results in a better compression ratio.

#A ppp frame includes fcs software

Payload: Cisco IOS software supplies three different payload compression options for PPP, namely Lempel-Ziv Stacker (LZS), Microsoft Point-to-Point Compression (MPPC), and Predictor. Resolves out-of-order issues with LFI.Ĭompression: payload, TCP header and/or RTP header. ppp multilink multiclass the sequence number is maintained per class and so the interleaved small packets also would have the multilink header and so could be ordered correctly.The fragment delay is set to 10 ms, so the fragments will be of size (256,000 * 0.01) = 2560 bits = 320 bytes. ppp multilink fragment-delay x : size = x * bandwidth Note that the unit for the delay parameter is milliseconds, so the units for the interface bandwidth must also be converted.LFI tools fragment larger packets, and then send the delay-sensitive packet after just a portion of the original, longer packet.

Link Fragmentation and Interleaving (LFI): prevent small, delay-sensitive packets from having to wait on longer, delay-insensitive packets to be completely serialized out an interface. both-Use the peer authenticated name and endpoint discriminator as the bundle name.endpoint-Use the peer endpoint discriminator as the bundle name.This option cannot support multiple clients using the same authentication username. authenticated-Use the peer authenticated name as the bundle name.add header of 2 or 4 bytes for reassembly (sequence number and Flag bits designating the beginning and ending fragments) Layer 2 load balancing ( ML-PPP fragments the packet and sends the packet to each link.Looped link detection (send random magic number.if the percentage falls under configured value – frop the link). Link Quality Monitoring (LQM) (statistics about frames wo errors.Supports synchronous and asynchronous links? (The Padding field allows PPP toĮnsure that the frame has an even number of bytes.) Optional Padding field to the original HDLC framing.

PPP framing (RFC 1662) defines the use of a simple HDLC header and trailer for most parts

#A ppp frame includes fcs iso

The ISO standard for the much older HDLC does not include a Type field, so the Cisco HDLC implementation adds a Cisco-proprietary 2-byte Type field to support multiple protocols over an HDLC link.