Changing an ATM High-Speed Signaling Link Parameter Set

This procedure is used to change any of the ATM signaling link parameters using the chg-atm-lps command or to copy the values from one link parameter set to another.

Caution:

Changing the values in an ATM link parameter set will impact the performance of all the signaling links using the ATM parameter set being changed.

The chg-atm-lps command uses these parameters.

:lpset – the link parameter set being changed.

Range of values – 1 - 30

:action – copy a set of ATM signaling link parameters from one parameter set to another.

Value – copy

:srclpset – the ATM signaling link parameter set used as a source for the action=copy parameter.

Range of values – 1 - 30

:maxcc – the maximum number of transmissions of a BGN, END, ER, or RS PDU

Range of values – 1 - 10

System default – 4

:maxpd – the maximum number of SD PDUs that can be sent before a POLL is sent

Range of values – 5 - 2120

System default – 500

:maxstat – the maximum number of list elements in a STAT PDU

Range of values – 3 - 67

System default – 67

:tmrcc – the timer, in milliseconds, used during the connection phase to guard against unacknowledged BGN, END, ER or RS PDUs

Range of values – 100 - 2000

System default – 200

:tmrkalive – the timer, in milliseconds, used during the transient phase when no SD PDUs are being sent to keep connection up

Range of values – 25 - 500

System default – 100

:tmrnorsp – the timer, in milliseconds, used to check that STAT PDUs are arriving often enough

Range of values – 500 - 2000

System default – 1500

:tmrpoll – the timer, in milliseconds, used to guarantee that POLL PDUs are sent often enough

Range of values – 25 - 500

System default – 100

:tmridle – the timer, in milliseconds, used during the idle phase when no SD PDUs are being sent to limit time in the idle phase

Range of values – 25 - 1000

System default – 100

:tmrt1 – the time, in milliseconds, between link release action and the next link reestablish action during alignment

Range of values – 1000 - 15000

System default – 5000

:tmrt2 – the total time, in milliseconds, that SSCF will attempt alignment

Range of values – 15000 - 180000

System default (ANSI ATM) – 120000

System default (E1 ATM) – 30000

:tmrt3 – the time, in microseconds, between proving PDUs

Range of values – 450 - 23000

System default – 925

:n1 – the number of PDUs sent during proving

Range of values – 500 - 64552

System default (ANSI ATM) – 64552

System default (E1 ATM) – 1000

:maxnrp – the maximum number of retransmitted PDUs during proving

Range of values (ANSI ATM) – 1 - 10

Range of values (E1 ATM) – 0 - 10

System default (ANSI ATM) – 1

System default (E1 ATM) – 0

:tmrsrec – the timer, in milliseconds, used to prohibit closely spaced SSCOP recoveries from occurring

Range of values – 60000 - 10800000

System default – 3600000

:tmrnocred – the timer, in milliseconds, used when no credit exists and PDUs are available to be sent

Range of values – 1000 - 6000

System default – 1500

:tmrerm – the error rate monitor interval, in milliseconds

Range of values – 25 - 500

System default – 100

:nblk – the number of monitoring intervals per block

Range of values – 1 - 10

System default – 3

:tmrprov – the timer, in milliseconds, used to monitor the status of a link after it is placed into service

Range of values – 60000 - 1200000

System default – 600000

Link parameter sets 20 and 30 cannot be changed. The values in link parameter set 20 are set to the ANSI default values. The values in link parameter set 30 are set to the ITU default values. The values in link parameter set 20 and 30 can be copied to another link parameter set.

The values of the lpset and srclpset parameters cannot be the same.

The action and the srclpset parameters must be specified together.

If the action parameter is specified, only the lpset and srclpset parameters can be specified.

For any parameters not specified with the chg-atm-lps command, the values for those parameters are not changed.

The ATM parameter set values applied to ATM high-speed signaling links are displayed with the rtrv-atm-lps and rtrv-atm-prm commands. The values displayed with the rtrv-atm-prm command are not configurable. These values are:

PCR – The maximum or peak cell rate for the VCL (virtual channel link).

DS1 PCR value – 3622

E1 PCR value – 4528

SCR – The average or sustainable cell rate supported on the VCL.

DS1 SCR value – 3622

E1 PCR value – 4528

BT – Burst tolerance. The number of consecutive cells on the VCL permitted on the ATM interface by the enforcement process, given the PCR and the line speed.

Value – 210

CDVT – The amount of cell delay variation, in microseconds, for the VCL in the network ingress direction.

Value – 100

QoS – Quality of service. The performance objectives that must be met by the ATM VCL when it must discard cells during enforcement of the traffic parameters.

Value – 3

MaxVPC – The maximum number of simultaneously active Virtual Path Connections (VPCs) supported (by the ATM interface).

Value – 0

MAXVCC – The maximum number of simultaneously active Virtual Circuit Connections (VCCs) supported.

Value – 1

AllocVPI BITS – The number of bits to be used in the VPIs in the ATM cells for the VPLs terminated on the ATM interface.

Value – 12

AllocVCI BITS – The number of allocated VCI bits to be used in the VPIs in the ATM cells for the VCLs supported on the ATM interface.

Value – 16.

The rtrv-atm-lps command shows parameter values that cannot be configured with the chg-atm-lps command. These values are:

SDU SIZE – The maximum size, in octets, of the SDU

Value – 272

UU SIZE – The size, in octets of the SSCOP UU

Value – 4

N – The monitoring intervals needed to span the time when messages are not released from buffers as a result of a 400 millisecond error event.

Value – 9

FCNR – The moving credit increment value

Value – NULL

FCBC – The moving credit allocation frequency

Value – NULL

TSUP – The superblock timer value, in seconds

Value – 120

TLOSS – the stat loss limit timer value, in seconds

Value – 1.3

ERMSM – The exponential smoothing factor using in ERM

Value – 0.1

THRES – The threshold for comparing the running QoS computation by the ERM

Value – 0.244

For this example, the values ATM link parameter set 5 are being changed to these values.

maxcc = 8 PDUs

maxpd = 2000 PDUs

maxstat = 45 PDUs

tmrcc = 1500 milliseconds

tmrkalive = 500 milliseconds

tmrnorsp = 1000 milliseconds

tmrt1 = 10000 milliseconds

tmrt2 = 19000 milliseconds

tmrt3 = 3000 microseconds

n1 = 10000 PDUs

maxnrp = 7 attempts

tmrsrec = 750000 milliseconds

nblk = 6 monitoring intervals per block

Display the existing values for the ATM link parameter set being changed using the rtrv-atm-lps command specifying the link parameter set being changed. For this example, enter this command.

rtrv-atm-lps:lpset=5

This is an example of the possible output.

rlghncxa03w 06-10-28 16:02:05 GMT  EAGLE5 36.0.0
ATM LINK PARAMETER SET TIMERS AND PARAMETERS (REAL NUMBERS IN SECONDS)
                                SSCOP PARAMETERS
                              TMR  TMR     TMR    TMR   TMR
LPSET  MAXCC  MAXPD  MAXSTAT  CC   KALIVE  NORSP  POLL  IDLE
5      4      500    67       0.2  0.1     1.5    0.1   0.1

                                SSCF-NNI PARAMETERS
       TMRT1  TMRT2  TMRT3     N1
       05.0   120.0  0.000925  64552

                                SAAL PARAMETERS
       MAX  TMR     TNRNO  TMR  N    TMR
       NRP  SREC    CRED   ERM  BLK  PROV
       1    3600.0  1.5    0.1  3    0600.0

                          NONCONFIGURABLE PARAMETERS
       SDU   UU       FC  FC 
       SIZE  SIZE  N  NR  BC  TSUP  TLOSS  ERMSM  THRES
       272   4     9  --  --  120   1.3    0.1    0.244

Change the values of the ATM link parameter set with the chg-atm-lps command specifying the link parameter set. For this example, enter this command.
chg-atm-lps:lpset=5:maxcc=8:maxpd=2000:maxstat=45:tmrcc=1500 :tmrkalive=500:tmrnorsp=1000:tmrt1=10000:tmrt2=19000 :tmrt3=3000:n1=10000:maxnrp=7:tmrsrec=750000:nblk=6

This message should appear.
```
rlghncxa03w 06-10-28 00:22:57 GMT  EAGLE5 36.0.0
CHG-ATM-LPS: MASP A - COMPLTD
```

Verify the changes using the rtrv-atm-lps command and the link parameter set specified in step 2. For this example, enter this command.

rtrv-atm-lps:lpset=5

This is an example of the possible output.

rlghncxa03w 06-10-28 16:02:05 GMT  EAGLE5 36.0.0
ATM LINK PARAMETER SET TIMERS AND PARAMETERS (REAL NUMBERS IN SECONDS)
                                SSCOP PARAMETERS
                              TMR  TMR     TMR    TMR   TMR
LPSET  MAXCC  MAXPD  MAXSTAT  CC   KALIVE  NORSP  POLL  IDLE
5      8      2000   45       1.5  0.5     1.0    0.1   0.1

                                SSCF-NNI PARAMETERS
       TMRT1  TMRT2  TMRT3     N1
       10.0   019.0  0.003000  10000

                                SAAL PARAMETERS
       MAX  TMR     TNRNO  TMR  N    TMR
       NRP  SREC    CRED   ERM  BLK  PROV
       7    0750.0  1.5    0.1  6    0600.0

                          NONCONFIGURABLE PARAMETERS
       SDU   UU       FC  FC 
       SIZE  SIZE  N  NR  BC  TSUP  TLOSS  ERMSM  THRES
       272   4     9  --  --  120   1.3    0.1    0.244

Back up the new changes using the chg-db:action=backup:dest=fixed command. These messages should appear, the active Maintenance and Administration Subsystem Processor (MASP) appears first.

BACKUP (FIXED) : MASP A - Backup starts on active MASP.
BACKUP (FIXED) : MASP A - Backup on active MASP to fixed disk complete.
BACKUP (FIXED) : MASP A - Backup starts on standby MASP.
BACKUP (FIXED) : MASP A - Backup on standby MASP to fixed disk complete.

Figure C-14 Changing an ATM High-Speed Signaling Link Parameter Set