Performs a loop operation with another system.
loop [node node-id] mop client client-name [,optional args...]
For a LAN circuit, if there is no default Address and Circuit
information specified for this client in the MOP Client database,
then that information must be specified on the command line.
loop [node node-id] mop client client-name -
address lan-address, -
circuit circuit-name [,optional arguments...]
Optional arguments for this loop mop client command are:
Assistance Type, Assistant Address, Assistant System, Count,
Format, and Length.
Examples:
loop mop client lamchp ! Client provides Address and Circuit.
loop mop client lamchp - ! Overrides default Circuit
circuit csmacd-1 ! provided by Client
1 – address
Address is the LAN address of node to loop. If Address and
Circuit information is not supplied in the command on a LAN
circuit, then that information must be available from the MOP
Client database.
loop [node node-id] mop client client-name -
address lan-address, -
circuit circuit-name [,optional arguments...]
Optional arguments for this loop mop circuit command are:
Assistance Type, Assistant Address, Assistant System, Count,
Format, and Length.
Example:
loop mop client mynode - ! Client provides Circuit.
address 08-00-2b-33-45-DD
2 – assistance_type
Assistance Type is an optional argument that specifies the
degree of loopback assistance required. Valid Assistant Type
values are none, transmit, receive, and full. This argument
is for LAN circuits only. If Assistance Type is any value
other than none (the default), then an assistant is required.
An assistant can be specified either by including an Assistant
Address or Assistant System argument in the command line, but
not both. If neither is provided, then an assistant is
located by first sending a request to the loopback assistant
multicast address.
loop [node node-id] mop client lamchp -
assistance type transmit-receive-or-full, -
assistant address lan-address [,optional arguments...]
Address and Circuit information loop is required for the loop
mop client command. If the Client cannot provide default
Address and Circuit information, then that information must
be specified in the command.
loop [node node-id] mop client client-name -
address lan-address, -
circuit circuit-name, -
assistance type transmit-receive-or-full, -
assistant system client-name [,optional arguments...]
Examples:
loop mop client lamchp - ! Client gives Address and Circuit
assistant address aa-00-04-00-33-44, -
assistance type full
loop mop client lamchp - ! Client lamchp gives default Circuit
address 08-00-2b-34-44-EF, -
assistant system barbar,- ! barbar gives Assistant Address
assistance type full
3 – assistant_address
The optional Assistant Address argument specifies the LAN address
of the node to be used as a loopback assistant. This argument is
meaningful for LAN circuits only.
The involvement of the assistant depends on the Assistance Type
parameter. For assistance of type none (the default), no assistant
is needed, and is ignored if specified. For other values, an
assistant is required.
An assistant can be specified either by including an Assistant
Address or Assistant System argument in the command line, but not
both. If neither is provided, then an assistant is located by
first sending a request to the loopback assistant multicast
address.
loop [node node-id] mop client client-name -
assistance type transmit-receive-or-full, -
assistant address lan-address [,optional arguments...]
Address and Circuit information loop is required for the loop mop
client command. If the Client cannot provide default Address and
Circuit information, then that information must be specified in
the command.
loop [node node-id] mop client client-name -
address lan-address, -
circuit circuit-name, -
assistance type transmit-receive-or-full, -
assistant address lan-address [,optional arguments...]
Examples:
loop mop client lamchp - ! Client gives Address and Circuit
assistant address aa-00-04-00-33-44, -
assistance type transmit
loop mop client foofoo - ! Client gives default loop Address
circuit fddi-1, -
assistant address aa-00-04-00-33-44, -
assistance type receive
4 – assistant_system
The optional Assistant System argument specifies a MOP client
entity, from which an assistant address can be obtained.
This argument is meaningful for LAN circuits only. The
assistant address is the LAN address of the node to be used as
the loopback assistant.
The involvement of the assistant depends on the Assistance Type
parameter. For assistance of type none (the default), no
assistant is needed, and is ignored if specified. For other
values, an assistant is required.
An assistant can be specified either by including an Assistant
Address or Assistant System argument in the command line, but
not both. If neither is provided, then an assistant is
located by first sending a request to the loopback assistant
multicast address.
loop [node node-id] mop client client-name -
assistance type transmit-receive-or-full, -
assistant system client-name [,optional arguments...]
Address and Circuit information loop is required for the loop mop
client command. If the Client cannot provide default Address and
Circuit information, then that information must be specified in
the command.
loop [node node-id] mop client client-name -
address lan-address, -
circuit circuit-name, -
assistance type transmit-receive-or-full, -
assistant system client-name [,optional arguments...]
Examples:
loop mop client lamchp - ! Lamchp gives Address and Circuit
assistant system prkchp, - ! Client prkchp has Assistant Address
assistance type full
loop mop client foofoo - ! Client foofoo gives default Circuit
address 08-00-2b-44-33-5F, -
assistant system barbar, - ! Barbar gives Assistant Address
assistance type full
5 – circuit
The Circuit over which the loop operation is to be performed.
The the Client specified cannot provide Circuit and Address
information, then that information must be specified in the
command.
loop [node node-id] mop client client-name -
address lan-address, -
circuit circuit-name [,optional arguments...]
Optional arguments for this loop mop circuit command are:
Assistance Type, Assistant Address, Assistant System, Count,
Format, and Length.
Example:
loop mop client lamchp - ! Client lamchp gives loop Address
circuit csmacd-1
6 – count
The optional Count argument is an integer between 0-4294967295
which specifies the number of messages to be looped. The
default count is 1. Note, on failure of the loop test, NCL
will display the count of messages successfully looped.
loop [node node-id] mop client client-name -
count integer [,optional arguments...]
Address and Circuit information loop is required for the loop
mop client command. If the Client cannot provide default
Address and Circuit information, then that information must
be specified in the command.
loop [node node-id] mop client -
address lan-address, -
circuit circuit-name, -
count integer [,optional arguments...]
Examples:
loop mop client lamchp - ! Lamchp gives Address and Circuit
count 50
loop mop client mynode - ! Mynode gives default Address
circuit fddi-1, -
count 10
7 – format
The optional Format argument is an octet (00-FF) which
specifies the value of each byte in the test data part of
each loop message. The default results in alternating 0
and 1 bits (55).
loop [node node-id] mop client client-name -
format octect [,optional arguments...]
Address and Circuit information loop is required for the
loop mop client command. If the Client cannot provide
default Address and Circuit information, then that
information must be specified in the command.
loop [node node-id] mop client -
address lan-address, -
circuit circuit-name, -
format octet [,optional arguments...]
Examples:
loop mop client lamchp - ! Client gives Address and Circuit
format ff
loop mop client mynode - ! Client gives default Address
circuit fddi-1, -
format 00
8 – length
The optional Length argument specifies the length of the test
data part of each loop message. The maximum and minimum
permitted values depend on the particular data link in use.
The range is 0-4294967295. The default length is 40.
The optional Format argument is an octet (00-FF) which
specifies the value of each byte in the test data part of
each loop message. The default results in alternating 0 and
1 bits (55).
loop [node node-id] mop client client-name -
length integer [,optional arguments...]
Address and Circuit information loop is required for the loop
mop client command. If the Client cannot provide default
Address and Circuit information, then that information must
be specified in the command.
loop [node node-id] mop client -
address lan-address, -
circuit circuit-name, -
length integer [,optional arguments...]
Examples:
loop mop client lamchp - ! Client gives Address and Circuit
length 20
loop mop client mynode - ! Client gives default Circuit
address 08-00-2b-34-56-DD, -
length 45
9 – Exception Messages
o data link error
An error was reported by the Data Link layer on the loop
command.
o unrecognized client
There is no client with the specified identification on
the loop command.
o unrecognized circuit
There is no circuit with the specified identification on
the loop command.
o unrecognized assistant
There is no assistant with the specified identification on
the loop command. The specified Assistant System does not
exist in the MOP Client database.
o invalid assistant
The assistant address is either a multicast address, or
assistant system was specified, and the corresponding client
subentity has the default value for its address on the loop
command.
o timeout
Operation has timed out on the loop command.
o entity class not supported (OpenVMS)
MOP is not registered with EMAA. The NET$MOP process is
probably not started. For instructions on how to restart the
MOP process, refer to HELP NETWORK_MANAGEMENT MOP.