Use the LOOP CIRCUIT, LOOP EXECUTOR, LOOP LINE, and LOOP NODE
commands to test specified components in the network. Each
command causes test blocks of data to be transmitted over the
specified components. The parameters can be entered in any order
and are optional, except in the case of broadcast circuit loopback
tests which require a parameter to define the loopback destination.
LOOP CIRCUIT circuit-id (parameters ...)
EXECUTOR
LINE line-id
NODE node-id
1 – CIRCUIT
Use the LOOP CIRCUIT command to test a specified circuit in the
network. This command does not apply to X25 circuits. The
parameters are optional and can be entered in any order.
LOOP CIRCUIT circuit-id ASSISTANT PHYSICAL ADDRESS address
ASSISTANT NODE node-id
COUNT number
HELP help-type
LENGTH number
NODE node-id
PHYSICAL ADDRESS address
WITH
MIXED
ONES
ZEROES
All underscores found in parameters must be replaced with spaces
when parameters are used in NCP commands.
1.1 – ASSISTANT
1.1.1 – PHYSICAL ADDRESS address
Applies only to broadcast circuits. Identifies the physical address of the node that will perform the role of loopback assistant for third-party loop testing. This parameter must be specified if HELP is included in this command. The address cannot be a multicast address. This parameter can be used instead of the ASSISTANT NODE parameter.
1.1.2 – NODE node-id
Applies only to broadcast circuits. Identifies the name of the node or the address of the node that will perform the role of loopback assistant for broadcast third-party loop testing. This parameter can be used instead of the ASSISTANT PHYSICAL ADDRESS parameter.
1.2 – COUNT number
Specifies the number of blocks to be sent during loopback testing over the circuit. The count must be a decimal integer in the range of 1 through 65535. If the parameter is omitted, only one block is looped.
1.3 – HELP help-type
Applies only to broadcast circuits. Indicates the amount of
assistance to be provided during broadcast loopback testing by
the assistant node, whose address is specified in the ASSISTANT
PHYSICAL ADDRESS or node-id as specified in the ASSISTANT NODE
parameter. There are three possible values of help-type:
TRANSMIT The assistant node relays the request to the
destination node, which replies directly to the
executor node.
RECEIVE The executor node sends the request directly to the
destination node, which relays the reply to the
assistant node for transmission to the executor node.
FULL The assistant node relays the request and the reply
between the executor node and the destination node.
If HELP is specified, ASSISTANT PHYSICAL ADDRESS or ASSISTANT
NODE must also be specified.
1.4 – LENGTH number
Specifies the length (in bytes) of the blocks to be sent during loopback testing. The length must be a decimal integer in the range of 1 through 4096. Note that the LENGTH parameter must be less than 50 for the DMC-11 circuit operating in either controller loopback mode or cable loopback mode (a DMC-11 with an attached loopback cable). If the parameter is omitted, a block length of 4096 bytes is used.
1.5 – NODE node-id
Applies only to broadcast circuits. Identifies the destination node to be used for loopback testing of the specified broadcast circuit. Can be used instead of the PHYSICAL ADDRESS parameter.
1.6 – PHYSICAL ADDRESS address
Applies only to broadcast circuits. Identifies the physical address of the destination node to be used for loopback testing of the specified broadcast circuit.
1.7 – WITH data-type
Specifies the type of binary information to be sent during
testing. Three types of data can be sent:
MIXED
ONES
ZEROS
If omitted, a combination of ones and zeros (MIXED) is sent.
1.8 – Examples
NCP>LOOP CIRCUIT DMC-0 COUNT 5 LENGTH 20
This command initiates a circuit-level loopback test over circuit
DMC-0. The software loops five messages, 20 bytes in length with
mixed binary information.
NCP>LOOP CIRCUIT UNA-0 NODE 224
This command initiate an Ethernet circuit-level loopback test
with a node whose address is 224. In this example, the NODE
parameter with a node-id of 224 was used in place of the
PHYSICAL ADDRESS parameter.
2 – EXECUTOR
Use the LOOP EXECUTOR command to test the executor node in the
network. The parameters are optional and can be entered in any
order. You can supply explicit access control information for
the LOOP EXECUTOR command. This command does not apply to VAX
PSI.
LOOP EXECUTOR ACCOUNT account
COUNT number
LENGTH number
PASSWORD password
USER user-id
WITH
MIXED
ONES
ZEROS
2.1 – ACCOUNT
Identifies the user's account for access control verification for the executor node.
2.2 – COUNT
Specifies the number of blocks to be sent during loopback testing over the executor node. The count must be a decimal integer in the range of 1 through 65535. If the parameter is omitted, only one block is looped.
2.3 – LENGTH
Specifies the length (in bytes) of the blocks to be sent during loopback testing. The length must be a decimal integer in the range of 1 through 4096. If the parameter is omitted, a block length of 4096 bytes is used.
2.4 – PASSWORD
Identifies the user's password for access control verification for the executor node.
2.5 – USER
Specifies the user's identification for access control verification for the executor node.
2.6 – WITH
Specifies the type of binary information to be sent during
testing. Three types of data can be sent:
MIXED
ONES
ZEROS
If omitted, a combination of ones and zeros (MIXED) is sent.
2.7 – Example
NCP>LOOP EXECUTOR
This command initiates a loopback test on the executor node.
3 – LINE
Use the LOOP LINE command to initiate loopback testing of X25 lines
only. The parameters are optional and can be entered in any order.
Before beginning loopback testing of an X25 line, use the SET LINE
command to set the STATE SERVICE and CONTROLLER LOOPBACK parameters
for internal loopback testing or the STATE SERVICE and CONTROLLER
NORMAL for all other loopback testing.
LOOP LINE line-id COUNT number
LENGTH number
WITH
MIXED
ONES
ZEROS
3.1 – COUNT
Specifies the number of blocks to be sent during loopback testing over the line. The count must be a decimal integer in the range of 1 through 65535. If the parameter is omitted, only one block is looped.
3.2 – LENGTH
Specifies the length (in bytes) of the blocks to be sent during loopback testing. The length must be a decimal integer in the range of 1 through 65535. If the parameter is omitted, a block length of 40 bytes is used.
3.3 – WITH
Specifies the type of binary information to be sent during
testing. Three types of data can be sent:
MIXED
ONES
ZEROS
If omitted, a combination of ones and zeros (MIXED) is sent.
3.4 – Examples
NCP>LOOP LINE DUP-0
This command initiates a line-level loopback test over
X25 line DUP-0. The software loops one message, 4096 bytes
in length, with mixed binary information.
NCP>LOOP LINE DUP-1 COUNT 10 WITH ONES
This command initiates a line-level loopback test over
X25 line DUP-1. The software loops 10 messages, 4096 bytes
in length, with all binary ones information.
4 – NODE
Use the LOOP NODE command to test a specified node (other than the
executor node) in the network. The parameters are optional and can
be entered in any order. You can supply explicit access control
information for the LOOP NODE command.
To test the executor, use the LOOP EXECUTOR command.
LOOP NODE node-id ACCOUNT account
COUNT number
LENGTH number
PASSWORD password
USER user-id
WITH
MIXED
ONES
ZEROS
4.1 – ACCOUNT
Identifies the user's account for access control verification for the designated node.
4.2 – COUNT
Specifies the number of blocks to be sent during loopback testing over the node. The count must be a decimal integer in the range of 1 through 65535. If the parameter is omitted, only one block is looped.
4.3 – LENGTH
Specifies the length (in bytes) of the blocks to be sent during loopback testing. The length must be a decimal integer in the range of 1 through 4096. If the parameter is omitted, a block length of 4096 bytes is used.
4.4 – PASSWORD
Identifies the user's password for access control verification for the designated node.
4.5 – USER
Specifies the user's identification for access control verification for the designated node.
4.6 – WITH
Specifies the type of binary information to be sent during
testing. Three types of data can be sent:
MIXED
ONES
ZEROS
If omitted, a combination of ones and zeros (MIXED) is sent.
4.7 – Example
NCP>SET NODE TESTER CIRCUIT DMC-0
NCP>LOOP NODE TESTER
.
.
.
NCP>CLEAR NODE TESTER CIRCUIT
The first command creates a loop node name (TESTER) for
the associated circuit, the second command initiates a
node-level loopback test with the loop node name, and the
third command removes the loop node name from the volatile
database when the loopback is completed.