The UDP port of Abilis CPX implements the homonymous protocol for TCP/IP networks, which provides a transport service of Connection-Less type.
The protocol User Datagram Protocol (UDP) has functionalities less developed compared to the TCP one, without low control and capability of control and restore the correct data flow in the communication.
Within the Abilis CPX, the UDP port is used by the application services of the TCP/IP family, such as the RIP or SNMP ports. The UDP port uses, at its lower level, the network service provided by the IP Router port.
The UDP port is labelled within the Abilis CPX by the acronym "UDP" and it is provided with the parameters described in the following section:
Here is how to display parameters of UDP ports. Shown value are only examples.
[18:38:04] ABILIS_CPX: D P PO:902 PO:902 ------------------------------------------------------------------------ UDP CHK:YES reas-dg-num:10 reas-dg-size:2200
All changes made on the UDP port parameters, displayed by low case characters, can be activated only restarting the system.
| CHK: | Checksum control activation |
| YES | NO, YES |
It activates the control of the Checksum field of the UDP datagrams.
| reas-dg-num: | Number of reassembly buffers |
| 10 | 2 - 100 |
Maximum number of incomplete datagrams buffered in reassembler.
| reas-dg-size: | Size of a single buffer reassembler |
| 2200 | 576 - 32768 |
Maximum size of a reassembled datagram.
How to check the state and statistics of the UDP ports through the command D S.
[18:38:04] ABILIS_CPX: D S PO:902
PO:902 ------------------------------------------------------------------------
UDP ID Lsn LocPort
------------------------------------------------------------------------
1 1 123
2 2 161
3 3 2114
4 4 58072
-----------|---INPUT---|--OUTPUT---|-----------|---INPUT---|--OUTPUT---|
FRM | 107670| 95185|NO-PORT | 15129| |
CHK-ERR | 0| |ERR | 0| |
LOST | 0| |
------------------------------------------------------------------------
Extended statistics are also available for the UDP ports. Here is an example on how to check them using the command D SE:
[18:38:04] ABILIS_CPX: D SE PO:902
PO:902 ------------------------------------------------------------------------
UDP --- Cleared 003:22:25:43 ago, on 12/05/2000 at 12:11:38 ----------------
ID Lsn LocPort
------------------------------------------------------------------------
1 1 123
-----------|---INPUT---|--OUTPUT---|-----------|---INPUT---|--OUTPUT---|
FRM | 0| 0|LOST | 0| |
CHAR | 0| 0|
------------------------------------------------------------------------
2 2 161
-----------|---INPUT---|--OUTPUT---|-----------|---INPUT---|--OUTPUT---|
FRM | 0| 4|LOST | 0| |
CHAR | 0| 594|
------------------------------------------------------------------------
3 3 2114
-----------|---INPUT---|--OUTPUT---|-----------|---INPUT---|--OUTPUT---|
FRM | 92457| 95097|LOST | 0| |
CHAR | 1682538| 1690714|
------------------------------------------------------------------------
4 4 58072
-----------|---INPUT---|--OUTPUT---|-----------|---INPUT---|--OUTPUT---|
FRM | 96| 96|LOST | 0| |
CHAR | 5760| 5760|
------------------------------------------------------------------------
In both shown examples, there are two applicative ports requesting the UDP service. If no port of the upper level is requesting the UDP service, the following message will be shown: "No UDP connections".
The information "Cleared DDD:HH:MM:SS ago, at DD/MM/YYYY HH:MM:SS", referred by the extended statistics, shows the time interval elapsed from the last reset of statistics (by the format "days:hours:minutes:seconds") and date/time of its execution (by the format "day:month:year" and "hours:minutes:seconds").
| ID: | Identifier of the UDP session |
| 1 - 255 |
It identifies the UDP session.
| LSN: | Local identifier given to the session by the UDP port |
| 1 - 255 |
It identifies the Local (Local Session Number) identifier given to the session by the UDP port.
| LocPort: | Number of the IP local port used by the UDP connection |
| 0 - 65535 |
It shows the number of the IP local port used by the UDP connection.
| FRM: | Overall number of datagrams received/sent |
| 0 - 4.294.967.295 |
The counter FRM (INPUT) is incremented every time a frame is received, while the FRM (OUTPUT) one every time it is sent.
| NO-PORT: | Overall number of datagrams discarded because of destination port value |
| 0 - 4.294.967.295 |
The counter NO-PORT (INPUT) is incremented every time the UDP port receives and discards a datagram containing a destination port value for which no Abilis CPX application is active.
| LOST: | Overall number of datagrams discarded |
| 0 - 4.294.967.295 |
The counter LOST (INPUT) is incremented every time the UDP port receives and discards a datagram because the upper application level port is not ready to receive.
| ERR: | Overall number of bad datagrams received in all the sessions |
| 0 - 4.294.967.295 |
The counter ERR (INPUT) is incremented every time a datagram, containing an error (e.g. with a bad length) is received.
| CHK-ERR: | Overall number of checksum errors detected during reception of segments |
| 0 - 4.294.967.295 |
The counter CHK-ERR (INPUT) is incremented every time a segment, containing a checksum error, is received.
| CHAR: | Number of characters received/sent |
| 0 - 4.294.967.295 |
The counter CHAR (INPUT) is incremented every time a frame is received, while the counter CHAR (OUTPUT) every time a frame is sent.
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