Updated: 24 May 2001

DECnet-Plus for OpenVMS
Network Management

For example:

NCP> set x25-server destination host node mynode object 36 priority 200 - _ subaddresses 33-34

ncl> create x25 access filter host ncl> set x25 access filter host priority 200,subaddress range {[33..34]} ncl> create x25 server client host ncl> set x25 server client host filters {host} , - _ncl> node LOCAL:.mynode

H.2.8 LINE Database

The LINE database contains information about all types of lines used in DECnet Phase IV. The X.25-related information is for those lines whose protocol parameter is LAPB or LAPBE.

The X.25 entries in the LINE database contain the operating characteristics of each individual connection to the PSDN at X.25 level 2 (frame level). Default values are taken mostly from the profile. Users can modify these values so that their system configurations match their PSDN subscription options. Table H-8 shows the parameter mapping rules.

Table H-8 LINE Database

Phase IV Name	Phase V Entity	Attribute	Type
LINE	modem connect line	communications port	Simple name
	lapb link	Identifier	Simple name
CONTROLLER +	modem connect line	N/A 1
COUNTER TIMER +	N/A
HOLDBACK TIMER +	lapb link	holdback timer	Unsigned
INTERFACE +	lapb link	interface type	Enumerated {[DTE], DCE}
MAXIMUM BLOCK +	lapb link	maximum data size	Unsigned
MAXIMUM RETRANSMITS +	lapb link	retry maximum	Unsigned
MAXIMUM WINDOW +	lapb link	window size	Unsigned
NETWORK	lapb link	profile 2,3	Simple name
PROTOCOL	lapb link	sequence modulus	UNSIGNED 8(LAPB) or 128(LAPBE)
RECEIVE BUFFERS +	lapb link	receive buffers	Unsigned
RETRANSMIT TIMER +	lapb link	acknowledge timer	Unsigned
STATE +	lapb link	N/A 4

For example:

NCP> define line dsv-0-0 network mynet protocol lapb state on

ncl> create modem connect line dsv-0 communication port DSV-0-0 - _ncl> , profile "NORMAL" ncl> set modem connect line dsv-0 - _ncl> modem control full, speed 9600 , suppress test indicator true ncl> create lapb link dsv-0 profile "ISO8208" ncl> set lapb link dsv-0 physical line modem connect line dsv-0 , - _ncl> acknowledge timer 2718 , holdback timer 1359 , maximum data size 1031 - _ncl> , window size 7

H.2.9 X29-SERVER Database

The X29-SERVER database serves as the incoming X.29 call handler and controls the number of incoming X.29 connections on the system. In DECnet Phase V, it is merged with the X.25 call handler (X25 Access module and x25 access application entity). Table H-9 shows the parameter mapping rules.

Table H-9 X29-SERVER Database

Phase IV Name	Phase V Entity
MODULE X29-SERVER	N/A
COUNTER TIMER +	N/A
MAXIMUM CIRCUITS +	N/A
STATE +	x25 access application x29_login

Each destination either points to an entry in the DECnet-VAX OBJECT database or it contains no object record. In the former case, the object identifies a command procedure to invoke. (VAX P.S.I. does not support executable images.) In the latter case, the call is considered to be for LOGINOUT.

In DECnet Phase V, objects are replaced by x25 access application entities. Each application specifies a set of filters to listen for incoming calls by using the filters attribute. The file attribute identifies a command procedure to invoke when a call is received. The type attribute for these applications should be set to X29 or X29 login if the call goes to LOGINOUT.

Table H-10 shows the parameter mapping rules.

Table H-10 X29-SERVER Destination Database

Phase IV Name	Phase V Entity	Attribute	Type
DESTINATION	x25 access filter 1	Identifier	Simple name
	x25 access application 1	filters	Set of simple name
	x25 access application	type	X29 or X29 login 2
OBJECT +	x25 access application	Identifier	Simple name
USER	x25 access application	user	Latin1String
PASSWORD	N/A	N/A	N/A
ACCOUNT +	x25 access application	account 3	Latin1String
CALL MASK +	x25 access filter	call data mask	Octet string
CALL VALUE +	x25 access filter	call data value	Octet string
CALLED ADDRESS +	x25 access filter	originally called address	DTE address
EXTENSION MASK +	x25 access filter	called address extension mask	Octet string
EXTENSION VALUE +	x25 access filter	called address extension value	Octet string
GROUP +	x25 access filter	group	Simple name
INCOMING ADDRESS +	x25 access filter	incoming dte address	DTE address
NETWORK +	x25 access filter	inbound dte class	Simple name
PRIORITY +	x25 access filter	priority	Unsigned
RECEIVING DTE +	x25 access filter	receiving dte address	DTE address
REDIRECT REASON +	x25 access filter	redirect reason	Enumerated {[Not Specified], Busy, Out of Order, Systematic}
SENDING ADDRESS +	x25 access filter	sending dte address	DTE address
SUBADDRESSES +	x25 access filter	subaddress range	Set of range of unsigned

H.2.11 X.25 Information in the CIRCUIT Database

• Routing circuits have the OWNER qualifier set to EXECUTOR and the TYPE qualifier set to PERMANENT, OUTGOING, or INCOMING. There are three separate types of routing circuits over X.25 in DECnet Phase IV.
  • Permanent: Use an X.25 permanent virtual circuit (PVC) to provide a datalink service analogous to a leased line. Section H.2.11.3 covers this type of circuit.
  • Outgoing: Use an X.25 switched virtual circuit (SVC) to provide the datalink service. Calls are initiated to a remote system that is identified by the NETWORK and NUMBER qualifiers. Section H.2.11.1 covers this type of circuit.
  • Incoming: Use an X.25 switched virtual circuit (SVC) to provide the datalink service. Calls are received from one or more remote systems, with access controlled by the NETWORK and NUMBER qualifiers. Section H.2.11.2 covers this type of circuit.
• X.25 application PVC circuits should have the TYPE qualifier set to PERMANENT and have no OWNER qualifier specified. Section H.2.11.4 covers this type of circuit.

Although the PVC entities in Phase IV management are contained in the CIRCUIT database, they are invalid unless they can use an X25-PROTOCOL DTE database. This fact is important in DECnet Phase V because PVCs are child entities of x25 protocol dte entities.

Phase IV DLM circuits correspond to the X.25 static incoming, static outgoing, and permanent circuits used by DECnet Phase V routing over the Connectionless-Mode Network Service (CLNS). The following sections describe how these circuit types are configured for DECnet Phase V.

Refer to Chapter 8 for a more detailed description of how DECnet Phase V routing uses X.25.

H.2.11.1 DLM Outgoing Circuit

Phase IV DLM circuits of type OUTGOING are replaced by routing circuits of type x25 static outgoing in DECnet Phase V. The circuit's data link entity characteristic is set to X25 access. There is an additional parameter, initial minimum timer, that clears the circuit if no adjacency has been established when this timer expires.

Parameters for the outgoing call are defined by an associated X25 Access template which is specified by the routing circuit template attribute.

Table H-11 shows the parameter mapping rules.

Table H-11 DLM Outgoing Circuit DLM Database

Phase IV Name	Phase V Entity	Attribute	Type
CIRCUIT	routing circuit	Identifier	Simple name
COST +	N/A 3
COUNTER TIMER +	N/A
DTE +	N/A
HELLO TIMER +	N/A 3
MAXIMUM DATA +	x25 access template 5	packet size	Unsigned
MAXIMUM RECALLS +	routing circuit	maximum call attempts	Unsigned
MAXIMUM WINDOW +	x25 access template 5	window size	Unsigned
NETWORK	x25 access template 5	dte class	Simple name
NUMBER	x25 access template 5	destination dte address	DTE address
OWNER	N/A
RECALL TIMER +	routing circuit	recall timer	Unsigned
STATE +	routing circuit	N/A 1
TYPE	N/A
USAGE	routing circuit	type 2	x25 static outgoing
VERIFICATION +	routing circuit	receive verifier 4	Hex string
	routing circuit	transmit verifier 4	Hex string

For example:

NCP> set circuit x25-out usage outgoing network mynet number 12345678920 - _ maximum data 256 maximum window 7 maximum recalls 10 recall timer 60 - _ state on

ncl> create x25 access template rou_temp ncl> set x25 access template rou_temp dte class mynet,destination dte - _ncl> address 12345678920 ncl> set x25 access template rou_temp packet size 512,window size 7 ncl> create routing circuit x25-out type x25 static outgoing ncl> set routing circuit x25-out maximum call attempts 10, recall timer 60 ncl> set routing circuit x25-out template rou_temp ncl> enable routing circuit x25-out

H.2.11.2 DLM Incoming Circuit

Phase IV DLM circuits of type INCOMING are replaced by routing circuits of type x25 static incoming in DECnet Phase V. The circuit's data link entity characteristic is set to X25 access. There is an additional parameter, initial minimum timer, that clears the circuit if no adjacency has been established when this timer expires.

Parameters for call negotiation can be defined by an associated X25 Access template which is specified by the routing circuit template attribute.

Parameters for incoming call capture are defined by one or more X25 Access filters which are determined by the routing circuit x25 filters attribute.

When setting up an X25 Access filter for use with this type of circuit, specify the following filter characteristics for calls originating from DECnet Phase V systems:

• call data mask %xff
• call data value %x81

For calls originating from a Phase IV DLM system, use the subaddress range filter characteristic to select calls on the basis of the DTE subaddress or the call data value filter characteristic to select calls on the basis of the call data string DECNET_DLM.

Table H-12 shows the parameter mapping rules.

Table H-12 DLM Incoming Circuit Database

Phase IV Name	Phase V Entity	Attribute	Type
CIRCUIT	routing circuit	Identifier	Simple name
COST +	routing circuit	N/A 3
COUNTER TIMER +	N/A
DTE +	x25 access filter	N/A
HELLO TIMER +	routing circuit	N/A 3
MAXIMUM DATA +	x25 access template	packet size	Unsigned
MAXIMUM WINDOW +	x25 access template	window size	Unsigned
NETWORK +	x25 access filter	inbound dte class	Simple name
NUMBER +	x25 access filter	sending dte address	DTE address
OWNER	N/A
STATE +	N/A 1
TYPE	N/A
USAGE	routing circuit	type	x25 static incoming
VERIFICATION +	routing circuit	receive verifier 4	Hex string
	routing circuit	transmit verifier 4	Hex string

For example:

NCP> set executor subaddresses 20-30 NCP> set circuit x25-inc usage incoming network mynet - _ maximum data 256 maximum window 7 NCP> set circuit x25-inc sta on

ncl> create x25 access filter rou_filt ncl> set x25 access filter rou_filt subaddress range {[20..30]}, inbound dte - _ncl> class mynet ncl> create routing circuit x25-inc type x25 static incoming ncl> set routing circuit x25-inc x25 filters {rou_filt},template rou_temp ncl> enable routing circuit x25-inc

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