Link Configuration Mode Commands

Link Configuration Mode Commands
 
 
The Link configuration mode defines the MTP3 link parameters for a specific link in a linkset of an SS7 routing domain instance.
In this mode, the prompt will be similar to:
[local]hostname(config-ss7-rd-linkset-<#>-link-<#>)#
 
note_smallImportant: The commands or keywords/variables that are available are dependent on platform type, product version, and installed license(s).
 
arbitration
This command configures link arbitration.
Product
SGSN
Privilege
Security Administrator, Administrator
Syntax
arbitration { active | passive }
no arbitration
no
Removes the arbitration configuration for the link.
active
The SSCOP initiates the transmission of PDUs.
passive
The SSCOP waits to receive PDUs.
Usage
Sets the configuration to initiate transmission of PDUs.
Example
arbitration active
 
end
Exits the current configuration mode and returns to the Exec mode.
Product
All
Privilege
Security Administrator, Administrator
Syntax
end
Usage
Use this command to return to the Exec mode.
 
exit
Exits the current mode and returns to the parent configuration mode.
Product
All
Privilege
Security Administrator, Administrator
Syntax
exit
Usage
Use this command to return to the parent configuration mode.
 
mtp2-aerm-emergency-threshold
Configure the alignment error rate monitor (AERM) emergency threshold value. This command is only available for a lowspeed-narrowband link-type.
Product
SGSN
Privilege
Security Administrator, Administrator
Syntax
mtp2-aerm-emergency-threshold value
default mtp2-aerm-emergency-threshold
default
Resets the parameter to the default value of 1.
value
value : Enter an integer from 1 to 50. Default: 1.
Usage
This command sets the emergency threshold for the MTP2 alignment error rate monitor.
Example
Set the emergency AERM threshold to 17:
mtp2-aerm-emergency-threshold 17
 
mtp2-aerm-normal-threshold
Configure the alignment error rate monitor (AERM) normal threshold value. This command is only available for a lowspeed-narrowband link-type.
Product
SGSN
Privilege
Security Administrator, Administrator
Syntax
mtp2-aerm-normal-threshold value
default mtp2-aerm-normal-threshold
default
Resets the parameter to the default value of 4.
value
value : Enter an integer from 4 to 100. Default: 4.
Usage
This command sets the normal threshold for the MTP2 alignment error rate monitor.
Example
Set the normal AERM threshold to 55:
mtp2-aerm-normal-threshold 55
 
mtp2-eim-decrement
Configure the errored interval monitor (EIM) emergency decrement value. This command is only available for a highspeed-narrowband link-type.
Product
SGSN
Privilege
Security Administrator, Administrator
Syntax
mtp2-eim-decrement value
default mtp2-eim-decrement
default
Resets the parameter to the default value of 11.
value
value : Enter an integer from 1 to 63. Default: 11.
Usage
This command sets the emergency decrement value for the EIM.
Example
Reset the EIM emergency decrement to 1:
default mtp2-eim-decrement
 
mtp2-eim-increment
Configure the errored interval monitor (EIM) emergency increment value. This command is only available for a highspeed-narrowband link-type.
Product
SGSN
Privilege
Security Administrator, Administrator
Syntax
mtp2-eim-increment value
default mtp2-eim-increment
default
Resets the parameter to the default value of 198.
value
value : Enter an integer from 1 to 1023. Default: 198.
Usage
This command sets the emergency increment value for the EIM.
Example
Set the EIM emergency increment to 2:
mtp2-eim-increment 2
 
mtp2-eim-threshold
Configure the errored interval monitor (EIM) emergency threshold value. This command is only available for a highspeed-narrowband link-type.
Product
SGSN
Privilege
Security Administrator, Administrator
Syntax
mtp2-eim-threshold value
default mtp2-eim-threshold
default
Resets the parameter to the default value of 794.
value
value : Enter an integer from 1 to 65535. Default: 794.
Usage
This command sets the emergency threshold value for the EIM.
Example
Set the EIM emergency threshold to 154:
mtp2-eim-threshold 154
 
mtp2-error-correction
Configure the error correction method to be used. This command is only available for lowspeed or highspeed narrowband link-types.
Product
SGSN
Privilege
Security Administrator, Administrator
Syntax
mtp2-error-correction { basic | preventive-cyclic-retransmission }
default mtp2-error-correction
default
Resets the parameter to the default value.
basic
Basic error correction (BEC) is a positive / negative acknowledgement method that uses backwards retransmission. This method is best for links with less than 30 ms one-way propagation delays.
preventtive-cyclic-retransmission
PCR is recommended for links with 125 ms, or higher, propagation delays.
Usage
Set the method of MTP2 layer error correct to be used on the link.
Example
Set error correction for a link with 15 ms propagaion delay::
mtp2-error-correction basic
 
mtp2-lssu-len
This command sets the length of the link status signal unit (LSSU) which carries link status information used to manage link alignment and indicate the status of the signaling points to each other. This command is only available for lowspeed or highspeed narrowband link-types.
Product
SGSN
Privilege
Security Administrator, Administrator
Syntax
mtp2-lssu-len #_octets
default mtp2-lssu-len
default
Using this keyword with the command resets the length to the default of 1 octet.
#_octets
Sets the number of octets for the length of the LSSU.
#_octets: Must be either 1 or 2.
Usage
Use this command to define the maximum amount of link status information that is to be shared between signaling points.
Example
You can use the following command to set the LSSU length to 2 octets - the maximum length:
mtp2-lssu-len 2
 
mtp2-max-outstand-frames
This command sets the maximum number of outstanding packets to be sent by the link manager (linkmgr) - applicable for both high speed (HSL) and low speed (LSL) narrowband links.
Product
SGSN
Privilege
Security Administrator, Administrator
Syntax
mtp2-max-outstand-frames #_bytes
default mtp2-max-outstand-frames
default
Using this keyword with the command resets number of packets to the default of 7 bytes.
#_bytes
Sets the maximum number of packets sent by the linkmgr that can be allowed to be outsanding.
#_bytes: Must be an integer from 5 to 10.
Usage
The linkmgr (MTP2) sends data at a higher rate, than the narrowband (NB) E1 link speed, when in congestion and performing retransmission. This can lead to more congestion leading to more time taken for the link to come out of congestion. If using a value of 10 during congestion, then linkmgr pumps data at a rate higher than 2.5 mbps. To avoid this problem, a lower value is usually considered optimal. This configuration holds good for both HSL and LSL.
Example
Use the following command to reset the default number of outstanding packets sent by the LinkMgr:
default mtp2-max-outstand-frames
Set the maximum number of oustanding packets the linkmgr can send to 6:
mtp2-max-outstand-frames 6
 
mtp2-suerm-threshold
Configure the signal unit error rate monitor (SUERM) threshold. This command is only available for lowspeed-narrowband link-types.
Product
SGSN
Privilege
Security Administrator, Administrator
Syntax
mtp2-suerm-threshold value
default mtp2-suerm-threshold
default
Resets the parameter to the default value.
value
Defines the threshold for number of bad frames
value: Enter an integer from 64 to 1023. Default is 64.
Usage
Sets the threshold for link monitoring of bad frames.
Example
Set a new link monitoring bad frames (SEURM) threshold of 256:
mtp2-suerm-threshold 256
 
mtp3-discard-priority
Configure MTP3 message discard priority.
Product
SGSN
Privilege
Security Administrator, Administrator
Syntax
mtp3-discard-priority priority
default mtp3-discard-priority
default
Resets the priority to the default value.
priority
priority: must be an integer between 0 and 3.
Default is 0.
Usage
Use this command to manage MTP3 messaging.
Example
mtp3-discard-priority 2
 
mtp3-max-slt-try
Configure maximum number of times to retry SLT (signaling link test).
Product
SGSN
Privilege
Security Administrator, Administrator
Syntax
mtp3-max-slt-try retries
default mtp3-max-slt-try
default
Resets the number of retries to the default value.
retries
retries: must be an integer between 1 to 65535.
Default is 10.
Usage
Use this command to troubleshoot MTP3 link mismatch.
Example
mtp3-max-slt-try 35
 
mtp3-msg-priority
Configures the priority for sending MTP3 management messages.
Product
SGSN
Privilege
Security Administrator, Administrator
Syntax
mtp3-msg-priority priority
default mtp3-msg-priority
default
Resets the number of priority to the default value.
priority
priority: must be an integer from 0 to 3.
Default: 0
Usage
Use this command to set the priority for sending MTP3 management messages.
Example
Use the following to set the message priority to 3:
mtp3-msg-priority 3
 
mtp3-msg-size
Configures the size of messages from layer 3 to layer 2.
Product
SGSN
Privilege
Security Administrator, Administrator
Syntax
mtp3-msg-size size
default mtp3-msg-size
default
Resets the the size to the default value which is 4096 (for q.2140) or 272 (for MTP2)
size
size: must be an integer from 1 to 272 for high-speed or low-speed narrowband SS7 links.
size: must be an integer from 1 to 4096 for ATM broadband links.
Usage
Use this command to set the maximum message size, in bytes.
Example
Use this command to set the MTP3 message size to 4096 bytes:
mtp3-msg-size 4096
 
mtp3-p1-qlen
Configure the size for the MTP3 p1 queue length.
Product
SGSN
Privilege
Security Administrator, Administrator
Syntax
mtp3-p1-qlen size
default mtp3-p1-qlen
default
Resets the number of size of the priority 1 queue to the default value.
size
size: integer from 1 to 65535. Size should be less than MTP3 p2 qlen and p3 qlen.
Default: 1024
Usage
Use this command to configure the queue length threshold for raising the congestion priority to level 1.
Example
Use this command to set the queue length priority to 128:
mtp3-p1-qlen 128
 
mtp3-p2-qlen
Configure the size of the priority 2 queue.
Product
SGSN
Privilege
Security Administrator, Administrator
Syntax
mtp3-p2-qlen size
default mtp3-p2-qlen
default
Resets the number of size of the priority 2 queue to the default value.
size
size: integer from 1 to 65535. Size should be less than MTP3 p3 qlen and greater than p1 qlen.
Default: 1024
Usage
Use this command to configure the queue length threshold for raising the congestion priority to level 2.
Example
Use this command to set the queue length threshold to 256:
mtp3-p2-qlen 256
 
mtp3-p3-qlen
Configure the size of the priority 3 queue.
Product
SGSN
Privilege
Security Administrator, Administrator
Syntax
mtp3-p3-qlen size
default mtp3-p3-qlen
default
Resets the number of size of the priority 3 queue to the default value.
size
size: integer from 1 to 65535. Size should be greater than MTP3 p1 qlen and p2 qlen .
Default: 1024
Usage
Use this command to configure the queue length threshold for raising the congestion priority to level 3.
Example
mtp3-p3-qlen 1024
 
mtp3-test-pattern
Configures the character string for the test message.
Product
SGSN
Privilege
Security Administrator, Administrator
Syntax
mtp3-test-pattern pattern
default mtp3-test-pattern
default
Resets the pattern to the default value.
pattern
pattern: 1 to 15 alphanumeric characters.
Default: SGSN-ORIGINATED
Usage
Use this command to define a test pattern string for the signalling link test match (SLTM).
Example
mtp3-test-pattern TEST1-HomeOffice
 
priority
Configures the MTP3 Link Priority.
Product
SGSN
Privilege
Security Administrator, Administrator
Syntax
priority pri_value
no priority
no
Removes the priority configuration.
pri_value
pri_value: 0 represents highest priority and 15 represents the lowest priority.
Usage
Use this command to configure the link priority within the MTP3 link set.
Example
priority 2
 
signaling-link-code
Configures the signaling link code (SLC).
Product
SGSN
Privilege
Security Administrator, Administrator
Syntax
signaling-link-code code
no signaling-link-code
no
Removes the SLC configuration.
code
code: integer from 0 to 15.
Usage
Use this command to uniquely identify the signaling link to be used for MTP3 management messages.
Example
signaling-link-code 4
 
sscf-nni-n1
Configures the SSCF NNI N1. This command is only available for ATM-broadband link-types.
Product
SGSN
Privilege
Security Administrator, Administrator
Syntax
sscf-nni-n1 value
no sscf-nni-n1
default
Removes the sscf-nni-n1 configuration.
value
value: integer from 1 to 65535.
Default: 1000
Usage
Use this command to identify the network-to-node interface (NNI) between the MTP3 and SSCOP layers.
Example
sscf-nni-n1 4064
 
sscop-max-cc
Configure the maximum value for the SSCOP connection control (CC) state variable. his command is only available for ATM-broadband link-types.
Product
SGSN
Privilege
Security Administrator, Administrator
Syntax
sscop-max-cc value
no sscop-max-cc
default
Removes the sscop-max-cc configuration.
value
value: integer from 1 to 65535.
Default: 4
Usage
Use this command as part of the configuration responsible for managing the SSCOP connection. This command sets the number of times retries.
Example
sscop-max-cc 256
 
sscop-max-pd
Configures the maximum acceptable value for the SSCOP state variable VT(PD). his command is only available for ATM-broadband link-types.
Product
SGSN
Privilege
Security Administrator, Administrator
Syntax
sscop-max-pd value
no sscop-max-pd
default
Removes the sscop-max-pd configuration.
value
value: integer from 1 to 65535.
Default: 500
Usage
Use this command to define the maximum number of data PDUs transmitted between POLL PDUs.
Example
sscop-max-pd 2500
 
sscop-max-stat
Configures the maximum number of elements included in a status PDU. his command is only available for ATM-broadband link-types.
Product
SGSN
Privilege
Security Administrator, Administrator
Syntax
sscop-max-stat value
no sscop-max-stat
default
Removes the sscop-max-stat configuration.
value
value: integer from 3 to 65535. This parameter should be an odd integer greater than or equal to 3.
Defaultz; 67
Usage
Received in response to a POLL PDU, the STAT PDU includes information about the number of SD PDUs that have been received.
Example
sscop-max-stat 56000
 
timeout
This command enables configuration of an array of signaling and flow control timers - for MTP, SSCF, and SSCOP.
Product
SGSN
Privilege
Security Administrator, Administrator
Syntax
[ no ] timeout timer timer_value
no
Adding no to the timeout command removes the timer configuration.
timer timer_value
Select the timer and enter a value from the range.
For timers having different ranges for highspeed and lowspeed links or for different variants, the appropriate ranges will be displayed based on the link-type configured.
note_smallImportant: Currently, the China variant uses ITU values.
Timer
Link Type & Variant
Range of Times
Granularity = 100ms
Default Time
mtp2-tmr-t1
Alignment ready timer
Highspeed; ITU
160..3500 (16 - 350 seconds)
3000 (300 seconds)
 
Lowspeed; ITU
120 - 500 (12 - 50 seconds)
400 (40 seconds)
 
Highspeed; ANSI
160 - 3500 (16 to 350 seconds)
1700 (170 seconds)
 
Lowspeed; ANSI
120 - 500 (12 - 50 seconds)
130 (13 seconds)
mtp2-tmr-t2
Not aligned timer
Highspeed; ITU
50 - 1500 (5 - 150 seconds)
50 (5 seconds)
 
Lowspeed; ITU
50 - 150 (5 - 15 seconds)
50 (5 seconds)
 
Highspeed; ANSI
50 - 1500 (5 - 150 seconds)
230 (23 seconds)
 
Lowspeed; ANSI
50 - 150 (5 - 15 seconds)
115 (11.5 seconds)
mtp2-tmr-t3
Aligned timer
Highspeed/Lowspeed; ITU
10 - 140 (1 - 14 seconds)
15 (1.5 seconds)
 
Highspeed/Lowspeed; ANSI
10 - 140 (1 - 14 seconds)
115 (11.5 seconds)
mtp2-tmr-t4e
Emergency proving period timer
Highspeed; ITU
4 - 60 (400 milliseconds - 6 seconds)
5 (500 milliseconds)
 
Lowspeed; ITU
4 - 6 (400 - 600 milliseconds)
5 (500 milliseconds)
 
Highspeed; ANSI
4 - 60 (400 milliseconds - 6 seconds)
50 (5 seconds)
 
Lowspeed; ANSI
4 - 6 (400 - 600 milliseconds)
6 (600 milliseconds)
mtp2-tmr-t4n
Normal proving period timer
Once set this timer can be reset but it can not be disabled.
Highspeed; ITU
30 - 700 (3 to 70 seconds)
3 (30 seconds)
 
Lowspeed; ITU
20 - 95 (2 - 9.5 seconds)
82 (8.2 seconds)
 
Highspeed; ANSI
30 - 700 (3 to 70 seconds)
3 (30 seconds)
 
Lowspeed; ANSI
20 - 95 (2 - 9.5 seconds)
23 (2.3 seconds)
mtp2-tmr-t5
Sending status indication busy (SIB) timer
Highspeed/Lowspeed
ITU/ANSI
1 - 2 (100 - 200 milliseconds)
1 (100 milliseconds)
mtp2-tmr-t6
Remote congestion timer
Highspeed/Lowspeed
ITU/ANSI
10 - 60 (1 to 6 seconds)
30 (3 seconds)
mtp2-tmr-t7
Excessive delay of acknowledgement timer
Highspeed/Lowspeed
ITU/ANSI
5 - 20 (500 milliseconds - 2 seconds)
10 (1 second)
mtp2-tmr-t8
Interval timer for error interval monitor timer
Highspeed
ITU/ANSI
1 - 2 (100 - 200 milliseconds)
1 (100 milliseconds)
mtp3-tmr-t1
Delay to avoid mis-sequencing on changeover timer
Highspeed/Lowspeed
ITU/ANSI
5 - 12 (500 - 1200 milliseconds)
5 (500 milliseconds
mtp3-tmr-t12
Waiting for uninhibit acknowledgement timer
Highspeed/Lowspeed
ITU/ANSI
8 - 15 (800 - 1500 milliseconds
8 (800 milliseconds
mtp3-tmr-t13
Waiting for force uninhibit timer
Highspeed/Lowspeed
ITU/ANSI
8 - 15 (800 - 1500 milliseconds
8 (800 milliseconds
mtp3-tmr-t14
Waiting for inhibition acknowledgement timer
Highspeed/Lowspeed
ITU/ANSI
20 - 30 (2000 - 3000 milliseconds
20 (2000 milliseconds
mtp3-tmr-t17
Delay to avoid oscillation of initial alignment failure and link restart
Highspeed/Lowspeed
ITU/ANSI
8 - 15 (800 - 1500 milliseconds
8 (800 milliseconds
mtp3-tmr-t2
Waiting for changeover acknowledgement
Highspeed/Lowspeed
ITU/ANSI
7 - 20 (700 - 2000 milliseconds
7 (700 milliseconds
mtp3-tmr-t22
Local inhibit test timer
Highspeed/Lowspeed
ITU/ANSI
1800 - 3000 (180 - 300 seconds
1800 (180 seconds)
mtp3-tmr-t23
Remote inhibit test timer
Highspeed/Lowspeed
ITU/ANSI
1800 - 3000 (180 - 300 seconds
1800 (180 seconds)
mtp3-tmr-t24
Stabilising timer after removal of local processor outage, used in LPO latching to RPO (national option)
Highspeed/Lowspeed
ITU/ANSI
5 - 15 (500 - 1500 milliseconds)
5 (500 milliseconds)
mtp3-tmr-t3
Time controlled diversion-delay to avoid mis-sequencing on changeback
Highspeed/Lowspeed
ITU/ANSI
5 - 12 (500 - 1200 milliseconds)
5 (500 milliseconds)
mtp3-tmr-t31
BSN requested timer
Highspeed/Lowspeed
ITU/ANSI
50 - 100 (5 to 10 seconds)
50 (5 seconds)
mtp3-tmr-t32
SLT timer
Highspeed/Lowspeed
ITU/ANSI
40 - 120 (4 - 12 seconds)
100 (10 seconds)
mtp3-tmr-t33
Connecting timer
Highspeed/Lowspeed
ITU/ANSI
50 - 100 (5 to 10 seconds)
50 (5 seconds)
mtp3-tmr-t34
Periodic signalling link test timer
Highspeed/Lowspeed
ITU/ANSI
300 - 900 (30 to 90 seconds)
600 (60 seconds)
mtp3-tmr-t4
Waiting for changeback acknowledgement (first attempt)
Highspeed/Lowspeed
ITU/ANSI
5 - 12 (500 to 1200 milliseconds)
5 (500 milliseconds)
mtp3-tmr-t5
Waiting for changeback acknowledgement (second attempt)
Highspeed/Lowspeed
ITU/ANSI
5 - 12 (500 to 1200 milliseconds)
5 (500 milliseconds)
mtp3-tmr-t7
Waiting for signalling data link connection acknowledgement
Highspeed/Lowspeed
ITU/ANSI
10 - 20 (1000 - 2000 milliseconds)
10 (1000 milliseconds)
‌
Timer
Link type & Variant
Range of Times
Default Time
sscf-nni-tmr-t1
ATM Broadband
ITU/ANSI
1 - 65535 (10 - 655350 milliseconds)
Granularity = 10 ms
500 (5 seconds)
sscf-nni-tmr-t2
ATM Broadband
ITU/ANSI
1 - 65535 (10 - 655350 milliseconds)
Granularity = 10 ms
3000 (30 seconds)
sscf-nni-tmr-t3
ATM Broadband
ITU/ANSI
1 - 65535 (10 - 655350 milliseconds)
Granularity = 10 ms
1 (10 milliseconds)
sscop-tmr-cc
SSCOP CC timer
ATM Broadband
ITU/ANSI
1 - 65535 (100 - 6553500 milliseconds)
Granularity = 100 ms
2 (200 milliseconds)
sscop-tmr-idle
SSCOP idle timer
(UNI 3.1 only)
ATM Broadband
ITU/ANSI
1 - 65535 (100 - 6553500 milliseconds)
Granularity = 100 ms
1 (100 milliseconds)
sscop-tmr-keep-alive
SSCOP keep alive timer
For stability purposes, tmrKeepAlive >/= tmrPoll and tmrKeepAlive < tmrNoResponse.
ATM Broadband
ITU/ANSI
1 - 65535 (100 - 6553500 milliseconds)
Granularity = 100 ms
1 (100 milliseconds)
sscop-tmr-no-rsp
SSCOP no response timer
For stability purposes, tmrNoResponse > tmrKeepAlive.
ATM Broadband
ITU/ANSI
1 - 65535 (100 - 6553500 milliseconds)
Granularity = 100 ms
15 (1.5 seconds)
sscop-tmr-poll
SSCOP poll timer
For stability purposes, tmrPoll <= tmrKeepAlive.
ATM Broadband
ITU/ANSI
1 - 65535 (100 - 6553500 milliseconds)
Granularity = 100 ms
1 (100 milliseconds)
‌
Usage
For a single link and specified link-type (highspeed or lowspeed), this command sets the timer values listed above. The SS7 variant is determined when the SS7 routing domain is first defined from the Global Configuration mode.
Repeat the timeout command (one timer and value per entry) as needed to configure all required timers.
note_smallImportant: Currently, the China variant uses the same timers, values, and defaults as the ITU variant.
Example
timeout timer timer_value
 
 
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