Point-to-Point Protocol (PPP) port

Revised for CPX 4.3.0.
PPP-specific terminology
PPP protocol overview
PPP port configuration
PPP port statistics and diagnostics
SNMP traps generated for the PPP ports
PPP port debug commands

PPP-specific terminology top

Host
Host is a computer or other device at the end of a link.
Point-to-Point
The point-to-point link is a connection between two hosts only (called peers in this case). For example, direct cable connection is a Point-to-Point connection, unlike Ethernet.
LCP
Protocol, determining basic capabilities of a PPP link
NCP
Protocol, determining options specific for a certain upper layer protocol (e.g. IP or IPX)

PPP protocol overview top

The Point-to-Point Protocol (PPP), specified in RFC 1661, provides a standard method for transporting multi-protocol datagrams over point-to-point links.

PPP is designed for simple links that transport packets between two peers. These links provide full-duplex simultaneous bi-directional operation, and are assumed to deliver packets in order. It is intended that PPP provide a common solution for easy connection of a wide variety of hosts, bridges and routers.

PPP is not a single protocol, but consists of several partly dependent protocols, of which LCP, IPCP and authentication protocols are of the most importance.

Link Control Protocol

The Link Control Protocol (LCP) is the base of PPP, negotiating basic link parameters such as timeouts, retries and authentication. It is build as the finite state automaton, having 10 states and driven by such events as link up/down, incoming packets and timeouts.

IP Control Protocol

The IP Control Protocol (IPCP) is an example of a Network Control Protocol (NCP), and is responsible for transporting IP traffic over a PPP link. Like LCP, it has the form of a finite state automaton, though a bit simplified. It negotiates IP addresses, DNS addresses and IP compression.

Authentication protocols

This PPP implementation makes use of one of the following protocols: PAP (Password Authentication Protocol), CHAP (Challenge-Handshake Authentication Protocol) and MS-CHAP (Microsoft CHAP) versions 1 and 2.

PAP is a simple plain-text protocol, requiring user to send username and password and server to respond with appropriate response. Due to its simplicity it is the most widespread protocol, but it is not very secure because of password transmitted in plain text form.

CHAP is more advanced protocol. Here client does not send password in plain form, but rather sends a value, derived from username, password and some data received from server. The process of calculating this value ("hashing") is such that it does not allow reconstructing password from it, thus making interception inefficient. However, it still requires both server and user to store password in plain text form, thus being vulnerable to theft attacks.

Microsoft has developed its own version of CHAP, solving this problem. There are two versions of MS-CHAP: version 1 and version 2. the latter being the most secure. Both are supported by current version.

For more information, consult the following documents:

PPP port configuration top

The PPP port is provided with the parameters described in this section.

The layout of the PPP port parameters changes considerably according to the used lower layer port type.

PPP over SYNC.

[13:51:12] ABILIS_CPX: D P PO:541 .
PO:541 ------------------------------------------------------------------------
PPP    LOG:DS           LOWPO:1
       - Tcp-MSS/Lcp/IpCp -----------------------------------------------------
       TCP-MSS-CLAMP:YES  TCP-MSS-VALUE:1414
       maxmru:1500        DNS:NO
       - Authentication -------------------------------------------------------
       USERNAME:myuserid                          LOCAL:CHAP
       PASSWORD:********************************
       SERVNAME:                                  REMOTE:CHAP
       REPEAT:0

PPP over FRAME-RELAY.

[13:51:12] ABILIS_CPX: D P PO:541 .
PO:541 ------------------------------------------------------------------------
PPP    LOG:DS           LOWPO:101        DLCI:16
       CIR:19200        BC:19200         BE:0             SC:4      CC:YES
       - Tcp-MSS/Lcp/IpCp -----------------------------------------------------
       TCP-MSS-CLAMP:YES  TCP-MSS-VALUE:1414
       maxmru:1500        DNS:NO
       - Authentication -------------------------------------------------------
       USERNAME:myuserid                          LOCAL:CHAP
       PASSWORD:********************************
       SERVNAME:                                  REMOTE:CHAP
       REPEAT:0

PPP over ISDN.

[13:51:12] ABILIS_CPX: D P PO:541 .
PO:541 ------------------------------------------------------------------------
PPP    LOG:DS           LOWPO:17      BCHAN:B2
       - Tcp-MSS/Lcp/IpCp -----------------------------------------------------
       TCP-MSS-CLAMP:YES  TCP-MSS-VALUE:1414
       maxmru:1500        DNS:NO
       - Authentication -------------------------------------------------------
       USERNAME:myuserid                          LOCAL:CHAP
       PASSWORD:********************************
       SERVNAME:                                  REMOTE:CHAP
       REPEAT:0

PPP over EIR (S-LINK).

[13:51:12] ABILIS_CPX: D P PO:541 .
PO:541 ------------------------------------------------------------------------
PPP    LOG:DS           LOWPO:200     VSPID:NONE   DT-IN:300     DT-OUT:300
       - Dial-in --------------------------------------------------------------
       DIAL-IN:YES   CGI:*                     SGI:*
                     CDI:*                     SDI:*
       - Dial-out -------------------------------------------------------------
       DIAL-OUT:YES  RTY:LIN     NRTY:5      NRTY2:3      NRTY3:3      TB:3
                     CGO:#                     SGO:#
                     CDO:#                     SDO:#
       - Tcp-MSS/Lcp/IpCp -----------------------------------------------------
       TCP-MSS-CLAMP:YES  TCP-MSS-VALUE:1414
       maxmru:1500        DNS:NO
       - Authentication -------------------------------------------------------
       USERNAME:myuserid                          LOCAL:CHAP
       PASSWORD:********************************
       SERVNAME:                                  REMOTE:CHAP
       REPEAT:0

PPP over EIR (P-LINK).

[13:51:12] ABILIS_CPX: D P PO:541 .
PO:541 ------------------------------------------------------------------------
PPP    LOG:DS           LOWPO:200     VSPID:1
       - Tcp-MSS/Lcp/IpCp -----------------------------------------------------
       TCP-MSS-CLAMP:YES  TCP-MSS-VALUE:1414
       maxmru:1500        DNS:NO
       - Authentication -------------------------------------------------------
       USERNAME:myuserid                          LOCAL:CHAP
       PASSWORD:********************************
       SERVNAME:                                  REMOTE:CHAP
       REPEAT:0

To activate changes made on the low case parameters it is needed to restart the system, on the contrary for the high case ones, it is enough to execute the initialization command INIT PO:.

Detail of the PPP port parameters

LOWPO: Identifier of the lower level Abilis CPX port
NONE 1 - 999, NONE

Sets the lower level port; it can be any P-LINK or an S-LINK port.

The value "NONE" makes the PPP port unusable.

BCHAN: Identifier of the channel B to use
B1 B1, B2

The parameter appears and can be modified only if the lower port is an ISDN Basic Rate port type, i.e. the service provided by "only data" ISDN adaptors.

Defines the channel to be used on the lower level ISDN port.

DLCI: Identifier of the DLCI to use
NONE 16-991, 1024-63487, 131072-8126463, NONE

The parameter appears and can be modified only if the lower port is a FR port type.

Defines the identifier of the DLCI to use the lower lever FR port.

The value "NONE" means "no DLCI" and it disables the connection with the lower level FR port.

The validity of allowed values intervals for the DLCI identifier depends on the length of the header Frame-Relay in use:

Value Meaning
NO No cryptography is applied.
DATA Cryptography is applied only on DATA traffic type.
VOICE Cryptography is applied only on VOICE traffic type.
ALL Cryptography is always in use, whatever is the traffic data type.
CC: Activation of the congestion control
YES NO, YES

The parameter appears and can be modified only if the lower port is a FR port type.

Makes possible to apply or to not apply the throughput reduction as reaction to congestion notifications.

warning!Not obeying to congestion notification may cause severe malfunctioning, therefore we strongly recommend to always use CC:YES. Ignoring congestion notification may be needed for some testing activities, certainly not during the regular work.

SC: Value of the "step count" for Congestion Control
4 1 - 50

The parameter appears and can be modified only if the lower port is a FR port type.

Sets how many consecutive frames with BECN=1 have to be received for reducing the throughput, according to the rule fixed by ANSI T1.618 annex A §2.1.1.

Value 4 suits the most frequent situations, however the right value can be evaluated by using the Calculator.

CIR: Value of "Committed Information Rate"
0 0, 4800 - 2500000 in bit/sec

The parameter appears and can be modified only if the lower port is a FR port type.

Defines the value of "Committed Information Rate", i.e. the throughput the frame-relay network has to guarantee in normal working conditions. This throughput is measured in the time interval TC (Time Committed) given by the following formula: TC=BC/CIR.

The set up value must correspond to that one established by contract with the operator of the frame-relay network.

BC: Value of "Burst Committed"
0 0, 2400 - 5000000 in bits

The parameter appears and can be modified only if the lower port is a FR port type.

Defines the "Burst Committed", i.e. the number of bits the network can accept, during the time interval TC, to guarantee the CIR.

If the network is congested, it sends a signal (BECN or FECN) that require the user to progressively reduce his throughput to values smaller than CIR.

The set up value must correspond to that one established by contract with the operator of the frame-relay network.

BE: Value of "Burst Excess"
0 0 - 5000000 in bits

The appears and can be modified only if the lower port is a FR port type.

Defines the "Burst Excess", i.e. the number of bits in excess that the network can manage, during the time interval TC, if there is availability of exceeding resources. The "exceeding throughput" is evaluated by using the following formula ThExcess=BE*TC.

When the network does not have resources in excess sends a signal (BECN or FECN) that engages the user to immediately limit the throughput to the value of the CIR.

The set up value must correspond to that one established by contract with the operator of the frame-relay network.

VSP-ID: Service Identifier
NONE NONE, 1 - 32

The parameter appears and can be modified only if the lower port is a EIR port type.

This parameter indicates which Virtual Synchronous Port (VSP) of those defined in the TDM table the PPP must use.

DT-IN: Disconnect timer on incoming call
300 numeric

The parameter appears and can be modified only if the lower port is any S-LINK, e.g. EIR port type with VSPID=NONE.

This parameter specifies inactivity timer for incoming calls, i.e if this PPP is called from outside and link is idle for this time, connection will be terminated.
Note that in this case only incoming packets are counted - packets coming from us to the client are not counted as activity.

DT-OUT: Disconnect timer on outgoing call
300 numeric

The parameter appears and can be modified only if the lower port is any S_LINK, e.g. EIR port type with VSPID=NONE.

This parameter specifies inactivity timer for outgoing calls, i.e if this PPP itself called a remote host and link is idle for this time, connection will be terminated.

Note that in this case only outgoing packets are counted - packets coming from the server are not counted as activity.

DIAL-IN: Incoming call allowance
YES NO, YES

Determines if this PPP will answer incoming calls, i.e. serve as a Dial-Up Server.
Usually only one of DIAL-IN and DIAL-OUT should be set.

CGI: Calling address of the incoming call
* from 1 up to 20 numerical characters [0- 9], *

Sets up the calling address, that the incoming call must contain.

The character "*" means "any number".

SGI: Calling sub-address of the incoming call
* from 1 up to 20 alphanumerical [0- 9, a - z, A- Z], *

Sets up the calling sub-address, that the incoming call must contain.

The character "*" means "any character".

CDI: Called address of the incoming call
* from 1 up to 20 numerical characters [0- 9], *

Sets up the called address, that the incoming call must contain.

The character "*" means "any number".

SDI: Called sub-address of the incoming call
* from 1 up to 20 alphanumerical [0- 9, a - z, A- Z], *

Sets up the called sub-address, that the incoming call must contain.

The character "*" means "any character".

DIAL-OUT: Outgoing call allowance
YES NO, YES

Determines if this PPP is allowed to make outgoing calls, e.g. call an ISP.
Usually only one of DIAL-IN and DIAL-OUT should be set.

RTY: Calls repetition rule on failures
INC LIN, INC, US

Allows to select the calls repetition rule on the S-Link channel following an unsuccessful call, and if the attempts are exhausted the S-Link channel is placed in STOPPED1 state.

If the switched connection is established the attempts counter is reset (connection was established!), however if "link-checks" are active a "second level verification" is executed and if it fails the connection is classified as "link-check failure". Three consecutives "link-check failures" forces the S-Link channel in STOPPED2 state preventing any further outgoing or incoming call!

Warning! The behaviour upon exhausted attempts is slightly different when RTY:US, see below or details.

Value Calls repetition rules
LIN The time interval between a call attempt and the next one is fixed and configurable through the parameter TB:.
INC The time interval between a call attempt and the next one, is doubled at every attempt, starting with the value defined in the parameter TB:.
US The abbreviation "US" stands for "unattended site".
In this case the S-Link channel driver activates the following procedure until success:
  1. the driver executes a number of tries equal to the value of the parameter NRTY: every TB: seconds, or until three consecutive "link-check" errors occur;
  2. the driver makes 8 calls every 15 minutes;
  3. the driver makes 4 calls every 1 hour;
  4. the driver makes 9 calls every 2 hours;
  5. the driver makes 8 calls every 6 hours;
  6. the driver is placed in the state STOPPED1 or STOPPED2 caused by the last error;
This procedure allows an "automatic recovery" from critical situations within three days from the first failure occurrence, afterwards a maintenance intervention is required.

It is important to emphasize that points 2,3,4,5,6 of the procedure do not distinguish between failure's reason (connection not established or connection established with "link-check" error) until the last attempt is reached and the last failure reason is used to set the final state (STOPPED1 or STOPPED2).
NRTY: Maximum number of CALL repetitions
5 0 - 65534, NOMAX

Specifies the maximum number of call repetitions for the S-Link channel when the connection cannot be established due to CALL command failure.
Once attempts are exhausted the port is placed in STOPPED1 state.

Info The behaviour upon exhausted attempts is slightly different when RTY:US.

Value Meaning
0 Outgoing calls are disabled.
1-65534 Calls are repeated as many times as the value.
NOMAX Calls are repeated indefinitely.
For "RTY:INC" the time interval of calls after the 65535th will not increase further, keeping the interval TB: * 65535 seconds.
For "RTY:US" the actual behaviour is identical to RTY:LIN because the condition that starts the "unattended site retries" will not be reached.
NRTY2:
3 0 - 65534, NOMAX

Specifies the maximum number of call repetitions for the S-Link channel when the connection cannot be established due to negotiation timeout.
Once attempts are exhausted the port is placed in STOPPED2 state.

NRTY3:
3 0 - 65534, NOMAX

Specifies the maximum number of call repetitions for the S-Link channel when the connection cannot be established due to negotiation failure (e.g. authentication error).
Once attempts are exhausted the port is placed in STOPPED3 state.

TB: Time base interval between calls repetitions
3 3 - 255 (in seconds)

Defines the "base" time interval that the retry procedure set in RTY: uses to calculate the delay between a call attempt that fails and the next one.

CGO: Calling address of the outgoing call
# from 1 up to 20 numerical characters [0- 9], #

Sets up the calling number of the outgoing call.

The character "#" means "no number", if it is set, the outgoing call will not contain the calling address.

SGO: Calling sub-address of the outgoing call
# from 1 up to 6 alphanumerical [0- 9, a - z, A- Z], #

Sets up the calling sub-address of the outgoing call.

The character "#" means "no number", if it is set, the outgoing call will not contain the calling sub-address.

CDO: Called address of the outgoing call
# from 1 up to 20 numerical characters [0- 9], #

Sets up the called number of the outgoing call.

The character "#" means "no number", if it is set, the outgoing call will not contain the called address.

SDO: Called sub-address of the outgoing call
# from 1 up to 6 alphanumerical [0- 9, a - z, A- Z], #

Sets up the called sub-address of the outgoing call.

The character "#" means "no number", if it is set, the outgoing call will not contain the called sub-address.

TCP-MSS-CLAMP: Whether to perform TCP MSS clamping
NO NO, YES

If set, forces PPP to change value of Maximum Segment Size in all TCP packets to one equal or lower than set with TCP-MSS-VALUE: option to avoid certain problems with PPP over Ethernet "black hole". Also can be used to reduce link latency at the cost of some bandwidth loss.

TCP-MSS-VALUE: Maximal TCP MSS value to allow
1414 496-1452

Specifies maximal allowed value for TCP Maximum Segment Size option.

This option is only visible if MSS clamping is allowed via TCP-MSS-CLAMP: parameter.

MAXMRU: Maximal value of MRU accepted
1500 1500 - 65535, NONE

Specifies the maximal value of MRU (Maximal Receive Unit) to be negotiated.
One can try increasing this value to improve performance slightly

Changes to this value cannot be applied without CPX restart.

DNS: DNS addresses negotiation
NO NO, RETRIEVE, PROVIDE

Specifies negotiation of DNS addresses with a remote host.

Value Meaning
NO No DNS address negotiation is performed.
PROVIDE PPP can provide DNS addresses (if specified in corresponding IP Port) to a remote host.
This is a common setting to be used on a Dial-Up Server.
RETRIEVE PPP requests DNS addresses from a remote host.
This is a typical setting while accessing an ISP.
USERNAME: Login UserName
no value up to 32 characters

Specifies UserName to authenticate to a remote peer.
Need not be set when operating as a Dial-Up Server.

PASSWORD: Login Password
no value up to 32 characters

Specifies Password to authenticate to a remote peer.
Need not be set when operating as a Dial-Up Server.

SERVNAME: CHAP Server name
no value up to 32 characters

Specifies this Server name to be sent along with CHAP Challenge.
Only needed for Dial-Up servers authorizing complicated clients with CHAP, usually can be left empty

LOCAL: As-Client Authentication allowed
CHAP NONE, any combination of PAP,CHAP,MSCHAP1,MSCHAP2

Specifies authentication protocols usable in Client mode, i.e if remote requires us to authenticate.

REMOTE: As-Server Authentication allowed
CHAP NONE, any combination of PAP,CHAP,MSCHAP1,MSCHAP2

Specifies authentication protocols usable in Server mode, i.e we'll require the remote to authenticate using one of these protocols.
Preference order is from most to least secure: MSCHAP2, MSCHAP1, CHAP, PAP.

REPEAT: CHAP Repeating authentication
NONE 1 - 999, NONE

Specifies how often, if ever, should CHAP require re-authentication while already connected, in seconds.
This parameter is intended to use when REMOTE:parameterr contains any CHAP protocol.

PPP port statistics and diagnostics top

[15:18:04] CPX-INTERNET:D S PO:541

PO:541 ------------------------------------------------------------------------
PPP    STATE:DOWN                LCP-PH:DEAD           IPCP-PH:DEAD
       LINK:READY                LCP-ST:STARTING       IPCP-ST:STARTING
       LOCAL-IP:000.000.000.000  REMOTE-IP:000.000.000.000
       ST1:0       ST2:0       ST3:0       TIME_CUR_CALL:0
       RTY:0       DT:0        USRTY:0     TDEL:0      TREM:0
       -----------|---INPUT---|--OUTPUT---|-----------|---INPUT---|--OUTPUT---|
       FAIL-CALL  |          0|          0|SUCC-CALL  |          0|          0|
       TIME-CALL  |          0|          0|           |           |           |
       AUTH-FAIL  |          0|          0|CHR        |          0|          0|
       PCK        |          0|          0|PCK-SYS    |          0|          0|
       DROPPED    |          0|           |LOST       |          0|           |
       ------------------------------------------------------------------------

[15:18:04] CPX-INTERNET:D SE PO:541

PO:541 ------------------------------------------------------------------------
PPP    --- Cleared 000:00:00:11 ago, on 03/09/2002 at 15:17:53 ----------------
       ST1:0       ST2:0       ST3:0       TIME_CUR_CALL:0
       -----------|---INPUT---|--OUTPUT---|-----------|---INPUT---|--OUTPUT---|
       FAIL-CALL  |          0|          0|SUCC-CALL  |          0|          0|
       TIME-CALL  |          0|          0|           |           |           |
       AUTH-FAIL  |          0|          0|CHR        |          0|          0|
       PCK        |          0|          0|PCK-SYS    |          0|          0|
       DROPPED    |          0|           |LOST       |          0|           |
       ------------------------------------------------------------------------
STATE: General PPP state
UP, DOWN, DELAYING, STOPPED1, STOPPED2, STOPPED3

States Meaning
UP PPP is either already connected or ready to connect.
DOWN Lower layer not connected.
DELAYING Temporarily unable to call due to delay after unsuccessful attempt. Incoming calls are accepted.
STOPPED1 Unable to call due to call failure limit exceeded. Incoming calls are accepted.
STOPPED2 Unable to call due to negotiation timeout limit exceeded. Incoming calls are accepted.
STOPPED3 Unable to call due tonegotiationn failure limit exceeded. Incoming calls are accepted.
LINK: Link state
NOTPRESENT, DOWN, READY, LISTENING, CONNECTED, CALLING, CALLED, CLEARING, CLEARED

Specifes state of a lower layer link.

States Meaning
NOTPRESENT Port specified by LOWPO: is not present or inactive.
DOWN Link is down due to some lower layer problems.
READY Link is ready to connect/listen.
LISTENING Link is listening for an incoming call.
CONNECTED Link is connected and ready to transmit data.
CALLING Link is actively calling the remote host.
CALLED Link is processing an incoming call.
CLEARING Link is actively terminating existing connection.
CLEARED Link was terminated from remote.
LCP-PH: LCP Protocol phase
DEAD, ESTABLISHING, AUTHENTICATING, NETWORK, TERMINATING

Current LCP Protocol phase, Consult RFC 1661 for details

States Meaning
DEAD LCP is inactive.
ESTABLISHING LCP is negotiating link parameters.
AUTHENTICATING Authentication protocol is running.
NETWORK LCP is ready to transmit upper layer traffic, NCPs can start.
TERMINATING LCP is terminating a connection. Over P-LINK LCP never goes to DEAD state, remaining in this one.
LCP-ST:
STARTING, STOPPED, STOPPING, REQSENT, ACKRCVD, ACKSENT, OPENED

Current LCP state

States Meaning
STARTING Waiting for lower link to go UP.
STOPPED Work finished, waiting for lower link to go DOWN.
STOPPING Terminate-Request sent.
REQSENT Configure-Request sent.
ACKRCVD Configure-Request sent and Configure-Ack received, but no Configure-Request received.
ACKSENT Configure-Request sent, Configure-Request received and Configure-Ack sent, but no Configure-Ack received.
OPENED Negotiation complete.
IPCP-PH:
DEAD, ESTABLISHING, NETWORK, TERMINATING

Current IPCP phase. For description, see LCP-PH:

IPCP-ST: IPCP state
STARTING, STOPPED, STOPPING, REQSENT, ACKRCVD, ACKSENT, OPENED

Current IPCP state. For description, see LCP-ST:

LOCAL-IP: Local IP address
0.0.0.0 xxx.xxx.xxx.xxx

IP address of this machine, corresponding to this IP port.
The value is set either if preset in IP port configuration, or retrieved from remote host.

REMOTE-IP: Remote IP address
0.0.0.0 xxx.xxx.xxx.xxx

IP address of machine on the other end of a link.
The value is set either if preset in IP port configuration, or provided by the remote host (which overrides preset value).

ST1: STOPPED1 Count
numeric

Determines how much times PPP went into STOPPED1 state

ST2: STOPPED2 Count
numeric

Determines how much times PPP went into STOPPED2 state

ST3: STOPPED3 Count
numeric

Determines how much times PPP went into STOPPED3 state

TIME_CUR_CALL: Current call time duration
numeric

Specifies how long is the current connection taking time.

RTY: STOPPED counter
numeric

Specifies how much times call was unsuccessful. When it reaches NRTY: value, and RTY: parameter is not US, PPP will go into STOPPEDx state. IfRTY: is US, additional, retries will be indicated by USRTY stat.

USRTY: STOPPED counter for RTY=US
numeric

Specifies how much times call was unsuccessful, after reaching NRTY: value. When it reaches 25, PPP will go into STOPPEDx state.
Valid only for RTY==US setting.

DT: Inactivity timer
numeric

Specifies time for which PPP was inactive. When it reaches the DT-IN: or DT-OUT: value PPP will close the link.

TDEL: Current delay between calls
numeric

Specifies how much PPP delays after ununsuccessfulAL before trying again.

TREM: Delay remaining
numeric

If STATE=DELAYING, specifies delay remaining before new CALL can be tried

SUCC-CALL: Successful CALLs
numeric

Specifies number of successful outgoing CALLs

FAIL-CALL: Failed CALLS
numeric

Specifies number of failed outgoing CALLs

TIME-CALL: Total connection time
numeric

Total time when PPP was connected

AUTH-FAIL: Authentication failed
numeric

Total number of authentication failures

CHR: Characters in/out
numeric

Total number of bytes received/sent

PCK:
numeric

Total number of packets received/sent

PCK-SYS:
numeric

Total number of system (LCP, IPCP and authentication) packets received/sent

DROPPED:
numeric

Number of packets dropped due to unknown protocol or incorrect order. Small numbers (about 1-2 per connection) do not indicate any malfunction

LOST:
numeric

Total number of packets lost due to queue overflow

SNMP traps generated for the PPP ports top

Trap own code Trap mnemonic SNMP variables shown in the trap Description
60 cxTrapPppDown cxPortIndex, cxPortType, cxPppDiagPppState, cxPppDiagLinkState, sysUpTime The SNMP Agent of the Abilis CPX generates this kind of trap every time the PPP port driver goes in to the "Down" states set.
61 cxTrapPppUp cxPortIndex, cxPortType, cxPppDiagPppState, cxPppDiagLinkState, sysUpTime The SNMP Agent of the Abilis CPX generates this kind of trap every time the PPP port driver exits the "Down" states set.
62 cxTrapPppStopped cxPortIndex, cxPortType, cxPppDiagPppState, cxPppDiagLinkState, sysUpTime The SNMP Agent of the Abilis CPX generates this kind of trap every time the PPP port driver goes in to the "Stopped" states set.
63 cxTrapPppReady cxPortIndex, cxPortType, cxPppDiagPppState, cxPppDiagLinkState, sysUpTime The SNMP Agent of the Abilis CPX generates this kind of trap every time the PPP port driver exits the "Stopped" states set.

Detail of SNMP variables shown in the PPP port traps

cxPortIndex ETH port which the SNMP trap refers to
0 - 999

This variable shows the CPX port number which the SNMP trap refers to.

cxPortType Type and description of the PPP port which the trap refers to
type - description

This variable shows either the port type which the trap refers to (in this case PPP) and the description eventually associated to it.

cxPppDiagPppState General PPP state
stopped1(0), stopped2(1), stopped3(2), delaying(3), down(4), up(5)

This variable stores the general PPP state value when the trap is generated (See STATE:).

SNMP variable valueCorresponding General PPP state
stopped1(0)STOPPED1
stopped2(1)STOPPED2
stopped3(2)STOPPED3
delaying(3)DELAYING
down(4)DOWN
up(5)UP
cxPppDiagLinkState Link state
not_present(0), down(1), ready(2), listening(3), calling(4), called(5), clearing(6), cleared(7), connected(8)

This variable stores the lower link state value when the trap is generated (See LINK:).

SNMP variable valueCorresponding Link state
not_present(0)NOTPRESENT
down(1)DOWN
ready(2)READY
listening(3)LISTENING
calling(4)CALLING
called(5)CALLED
clearing(6)CLEARING
cleared(7)CLEARED
connected(8)CONNECTED
sysUpTime Elapsed time from the system start to the event occurrence
0 - 4.294.967.295 or "ddd:hh:mm:ss"

This variable stores the elapsed time (in cent of second) from the system start to the SNMP trap event occurrence.

This value is usually shown by the format days:hours:minutes:seconds.

PPP port DEBUG commands top

LSN 0: Debug commands help
PO:541 ------------------------------------------------------------------------
PPP    BufferLength:207    Date/Time:30/08/2002 15:17:11 TraceTime:<NotRunning>

LSN 1: PPP information
LSN 2: IP information
LSN 3: Negotiated options
LSN 4: LCP/IPCP/Link states
LSN 5: Four above combined
LSN 10: CALL log (20 to clear)
LSN 11: PPP Negotiation log (21 to clear)
LSN 1: PPP information
PPP Not Connected, State=UP
STOPPED1 Counter: 0 (NRTY=5)
STOPPED2 Counter: 0 / 3
STOPPED3 Counter: 0 / 3

Time Connected: 00:00:47
Authentication: Local: NONE, Remote: NONE
Idle: 00:00:47 (DT=00:05:00 as server)
LSN 2: IP information
Not Connected
                 CONFIGURED
Local IP:      192.168.002.002
Remote IP:     000.000.000.000
Primary DNS:   000.000.000.000
Secondary DNS: 000.000.000.000
MRU:           1500
MTU:           1500

                 CONFIGURED         NEGOTIATED
Local IP:      192.168.002.003    192.168.002.003
Remote IP:     000.000.000.000    192.168.002.005
Primary DNS:   000.000.000.000    000.000.000.000
Secondary DNS: 000.000.000.000    000.000.000.000
MRU:           1500               1500
MTU:           1500               1492
LSN 3: Negotiated options
Not Connected
Local parameters:
MRU=1500  MagicNumber=0x30D61E2E  AuthProto=CHAP  PFC=YES  ACFC=YES  VJ=NO
Remote parameters:
MRU=1500  MagicNumber=0x00000000  AuthProto=NONE  PFC=NO  ACFC=NO  VJ=NO
Will accept negotiation: PAP
Will require negotiation: CHAP

Local parameters:
MRU=1500  MagicNumber=0x30D61E2E  AuthProto=CHAP  PFC=YES  ACFC=YES  VJ=NO
Remote parameters:
MRU=1492  MagicNumber=0x7D9C661A  AuthProto=NONE  PFC=YES  ACFC=YES  VJ=NO
LSN 4: LCP/IPCP/Link states
Not Connected
Link State: CONNECTED
LCP Phase: TERMINATING, State: STOPPED
IPCP Phase: DEAD, State: STARTING

Link State: CONNECTED
LCP Phase: NETWORK, State: OPENED
IPCP Phase: NETWORK, State: OPENED
LSN 5: Shows info for LSN 2, 3 and 4 in one call
LSN 10: CALL log
30.08.02 15:16:38  Listening
30.08.02 15:25:11  Accepting
30.08.02 15:25:11  Accepting - succeeded
30.08.02 15:29:35  Hanging up with cause 0x81-0x90 - 0xF0-0xA3
30.08.02 15:29:35  Hanging up - succeeded
30.08.02 15:29:35  ----------------
LSN 11: PPP negotiation log
30.08.02 15:29:35  LCP: Unsupported/unallowed CHAP method requested: 0x05
30.08.02 15:29:35  ----------------
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