Monitoring PPP Interfaces (Talk 5)

Packets:

31035

46550

Octets:

1614885

2421137

Compressed Octets:

931416

1521039

Incompressible Packets:

0

0

Discarded Packets:

0

0

Copied Packets:

1

0

Prot Rejects:

0

-

Compressor (transmit) statistics:

Recent compression ratio: 1.7:1

Decompressor (receive) statistics:

Recent compression ratio: 1.7:1

Packets

These counters indicate the number of compressed datagrams sent and received. On the output side, the count includes only those packets that were actually sent as PPP compressed datagrams; it does not include packets that were found to be incompressible and sent in their original uncompressed form.

These counters count the packets sent or received that had the

PPPprotocol type of X©00FD© (CDP). When STAC extended mode or MPPC has been negotiated, incompressible packets may be encapsulated in CDP datagrams. This encapsulation would include the incompressible packets in these counts.

Octets

These counters indicate the number of bytes effectively transmitted or received in compressed form. These counts re¯ect the lengths of the original datagrams before compression or after decompression.

Compressed octets

These counters indicate the number of bytes for all of the compressed datagrams sent and received. These counts are the lengths of the actual CDP packets after compression or before decompression.

Incompressible packets

These counters indicate the number of packets that were incompressible and therefore sent in original uncompressed form.

Discarded packets

These counters indicate how many packets were discarded because they could not be successfully decompressed. Typically these packets will be packets that the peer was transmitting just after the router has sent a Reset-Request, but before the peer has received and processed the Reset-Request. Packets are also dropped if the router detects that data in the packets is incorrect. An example of incorrect data is a packet that contains a bad sequence number.

If the number of discarded packets increases too rapidly, then packets are being lost or corrupted on the line, probably due to noise on the line, and the link performance may be degraded.

Protocol rejects

This counter indicates the number of Protocol-Rejects of CDP packets that have been received from a peer. This count should be zero, because the link will not send CDP packets if the use of compression has not already been negotiated.

Compression ratios

The ratios give an approximate indication of the effectiveness of the compressor and decompressor. These ratios are based on the number of plain-text bytes divided by the number of corresponding

Chapter 33. Con®guring and Monitoring Point-to-Point Protocol Interfaces 501

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IBM SC30-3681-08 manual Compressed octets, Incompressible packets, Protocol rejects, Compression ratios