SGSN PSP Configuration Mode Commands

SGSN PSP Configuration Mode Commands
 
 
The Peer-Server Process (PSP) configuration mode provides the commands to create, configure, bind, and manage a specific PSP instance included in an SS7 routing domain configuration.
In this mode, where information in italics is customer-defined, the command prompt should appear similar to:
[local]hostname(config-ss7-rd-1-ps-1-psp-1)#
 
note_smallImportant: The commands or keywords/variables that are available are dependent on platform type, product version, and installed license(s).
associate
Defines an association between the PSP instance and an application server process (ASP) instance.
Product
SGSN
Privilege
Security Administrator, Administrator
Syntax
associate asp instance asp_num
no associate
no
Removes the association between the PSP and the ASP from the routing domain configuration.
note_smallImportant: Using this command will probably result in the termination of all current subscriber sessions active through the peer-server.
asp_num
Identifies a specific ASP configuration. Up to four ASP instances can be configured for a single SS7 routing domain.
asp_num must be an integer from 1 through 4.
Usage
Use this command to create an association between a specific peer-server process (PSP) and a specific application server process (ASP) instance.
Before using the associate command, the values for the psp-mode and end-point commands must be configured.
Before using the associate command, the M3UA end-point of the ASP must be configured. Use the commands defined in the ASP Configuration Mode chapter of the Command Line Interface Reference.
Example
Associate this PSP instance with an ASP configuration instance:
associate asp instance 2
 
end
Exits the configuration mode and returns to the Exec mode.
Product
SGSN
Privilege
Security Administrator, Administrator
Syntax
end
Usage
Change the mode back to the Exec mode.
 
end-point
This command defines or deletes the IP address to be associated with the local SCTP end-point for the application server process (ASP).
Product
SGSN
Privilege
Security Administrator, Administrator
Syntax
end-point { address ip_address | port port_number }
no end-point [ address ip_address ]
port port_number
Configures the M3UA’s SCTP port number for the end-point.
port_number: Must be an integer from 1 to 65535.
Default: 2905.
no
Removes the ASP end-point association configuration from the PSP configuration.
note_smallImportant: This command can not be used as long as the PSP and the ASP are associated.
Usage
Use this command to manage the ASP end-point. At least one address needs to be configured for the ASP before the end-point can be associated with the PSP.
Example
Set the ASP end-point to IP address 192.168.1.1 with the following command:
end-point address 192.168.1.1
 
exchange-mode
Configures the exchange-mode for the PSP communication.
Product
SGSN
Privilege
Security Administrator, Administrator
Syntax
exchange-mode [ double-ended | single-ended ]
Usage
Use this command to toggle the exchange modes for the PSP to match the exchange mode supported by the ASP. The exchange mode specifies what type of ASP messages exchange is used in an IPSP communication.
The exchange-mode must be configured for ‘single-ended’ if the psp-mode has been configured for ‘client’.
Example
Change the exchange mode from the standard double-ended to single-ended:
exchange-mode single-ended
 
exit
Exits the current configuration mode and moves to the previous configuration mode.
Product
SGSN
Privilege
Security Administrator, Administrator
Syntax
exit
Usage
Return to the Peer-Service configuration mode.
 
psp-mode
Configures either client-mode or server-mode as the PSP’s operational mode.
Product
SGSN
Privilege
Security Administrator, Administrator
Syntax
psp-mode { client | server }
client
The PSP operates as a client.
server
The PSP operates as a server.
Usage
Instruct the peer-server process to operate in either client or server mode.
Example
Configure the PSP to operate in server mode:
psp-mode server
 
routing-context
Configures the behavior of the routing context in M3UA messages.
note_smallImportant: This keyword function is only available in releases 8.1 and higher.
Product
SGSN
Privilege
Security Administrator, Administrator
Syntax
routing-context { discard-inbound | process-inbound { insert-outbound | suppress-outbound }
default routing-context
default
Include this keyword with the command, to reset the configuration to the system default for routing-context which is a combination of process-inbound and insert-outbound.
discard-inbound
Sets the routing context received in M3UA messages to be discarded.
process-inbound
Sets the routing context received in M3UA messages to be processed.
insert-outbound
Sets the routing context so that it is added in the M3UA messages.
suppress-outbound
Sets the routing context so that it is suppressed in the M3UA messages.
Usage
In PSP (singled-ended) configuration mode, the settings for both the local routing context (the SGSN's routing context) and the peer routing context (the RNC's routing context) should be the same. If the routing contexts created at the SGSN and on the peer are different then this can cause the M3UA link to fail.
Routing context is an optional parameter when an M3UA association has only one associated peer-server.
Example
If the peer does not support routing context, then disable the routing context feature:
routing-context discard-inbound suppress-outbound
 
sctp-alpha
This stream control transmission protocol (SCTP) retransmission time out (RTO) parameter defines the RTO-Alpha value.
Product
SGSN
Privilege
Security Administrator, Administrator
Syntax
sctp-alpha value
default sctp-alpha
value
Defines a percentage (%) that represents the RTO portion of the round-trip time (RTT) calculation. This percentage value must be an integer between 0 and 65535.
default
Resets the sctp-alpha to the default value of 5%.
Usage
sctp-alpha is used in conjunction with other commands, such as the sctp-beta command, to determine the round-trip time (RTT) calculations. The Alpha parameter is used to manage load balancing within the SS7 environment for multi-homed peers.
Example
Set the SCTP RTO-Alpha value to 256% of the RTT calculation:
sctp-alpha 256
 
sctp-beta
This stream control transmission protocol (SCTP) retransmission time out (RTO) parameter defines the RTO-Beta value.
Product
SGSN
Privilege
Security Administrator, Administrator
Syntax
sctp-beta value
default sctp-beta
value
Defines a percentage (%) that represents the RTO portion of the round-trip time (RTT) calculation. This percentage value must be an integer between 0 and 65535.
default
Resets the sctp-beta to the default value of 10%.
Usage
Use this command in conjunction with other commands, such as the sctp-alpha command, to determine the round-trip time (RTT) calculations. The Beta parameter is used to manage load balancing within the SS7 environment for multi-homed peers.
Example
Set the SCTP RTO-Alpha value to 512% of the RTT calculation:
sctp-beta 512
 
sctp-checksum-type
This command selects the type of checksum algorithm to be used.
Product
SGSN
Privilege
Security Administrator, Administrator
Syntax
sctp-checksum-type { adler32 | crc32 }
default sctp-checksum-type
adler32
Selects the Adler-32 type of algorithm as a faster checksum function.
crc32
Selects the CRC-32, a slower but more reliable 32-bit cyclic redundancy check.
default
Resets the sctp-checksum-type to the default of CRC-32.
Usage
Use this command to set which type of checksum algorithm the SGSN is to use to validate SCTP packets.
Example
sctp-checksum-type crc32
 
sctp-cookie-life
This command sets the SCTP valid cookie life.
Product
SGSN
Privilege
Security Administrator, Administrator
Syntax
sctp-cookie-life value
default sctp-cookie-life
value
Sets the valid cookie life value in increments of 100 milliseconds. The range is 50 to 1200 .
default
Resets the sctp-cookie-life value to the default, 600 (= .6 seconds).
Usage
Use this command to set the SCTP cookie life.
Example
Set the SCTP cookie life to 1 second (1000 milliseconds):
sctp-cookie-life 1000
 
sctp-max-assoc-retx
This command sets the maximum number of datagram retransmissions to be associated with this peer server configuration.
Product
SGSN
Privilege
Security Administrator, Administrator
Syntax
sctp-max-assoc-retx value
default sctp-max-assoc-retx
value
Defines the maximum number of datagram retransmissions for an association. The value must be an integer between 0 and 255.
default
Resets the default for sctp-max-assoc-retx to 10.
Usage
Use this command to configure the maximum number of datagram retransmissions for an association. The endpoint will be declared unreachable after sctp-max-assoc-retx number of consecutive retransmissions to an endpoint on any transport address.
Example
sctp-max-assoc-retx 3
 
sctp-max-init-retx
This command sets the maximum number of retries to send the INIT datagram.
Product
SGSN
Privilege
Security Administrator, Administrator
Syntax
sctp-max-init-retx value
default sctp-max-init-retx
value
Sets the maximum number of retries. This value must be an integer between 0 and 255.
default
Resets the default for sctp-max-init-retx to 5.
Usage
Use this command to set the maximum number of retries the SCTP layer should make to send the INIT datagram to the peer to open an association.
Example
sctp-max-init-retx 3
 
sctp-max-mtu size
This command sets the number of bytes that comprise the maximum MTU size.
Product
SGSN
Privilege
Security Administrator, Administrator
Syntax
sctp-max-mtu-size value
default sctp-max-mtu-size
value
Sets the maximum number of bytes for the SCTP MTU size. This value must be an integer between 508 and 65535.
default
Resets the default for sctp-max-mtu-size to 1500 bytes.
Usage
Use this command to configure the size of the MTU.
Example
Set the maximum size of the MTU to 3000 bytes:
sctp-max-mtu-size 3000
 
sctp-max-out-strms
This command sets the maximum number of outgoing streams through the PSP going towards the peer server.
Product
SGSN
Privilege
Security Administrator, Administrator
Syntax
sctp-max-out-strms max#_out_streams
default sctp-max-out-strms
default
Resets the SGSN’s sctp-max-out-strms value to the default of 16.
max#_out_streams
The value must be an integer between 1and 65535. The value should match the peer node’s (STP/SG/RNC/HLR) number of in-bound streams.
Usage
Use this command to balance the stream throughput from the PSP to the peer server. The value for this command is used to validate the incoming packets in the SCTP layer.
Example
sctp-max-out-strms 3500
 
sctp-max-path-retx
This command sets the maximum number of datagram retransmissions for this path.
Product
SGSN
Privilege
Security Administrator, Administrator
Syntax
sctp-max-path-retx value
default sctp-max-path-retx
value
Sets the maximum number of datagram retransmission to a destination transport address. This value must be an integer from 0 to 255.
default
Resets the sctp-max-path-retx default to 5.
Usage
Use this command to set the maximum number of datagram retransmissions to a destination transport address. The destination transport address will be declared unreachable after the SGSN exhausts the sctp-max-path-retx number of consecutive retransmissions to a destination transport address.
Depending upon network conditions, lower values typically means faster detection of SCTP-Path failure.
Example
sctp-max-path-retx 10
 
sctp-rto-initial
This command sets the initial retransmission timeout for the SCTP.
Product
SGSN
Privilege
Security Administrator, Administrator
Syntax
sctp-rto-initial value
default sctp-rto-initial
default
Resets the system to the sctp-rto-initial default of 30 (3 seconds).
value
The value must be an integer between 1 and 50.
Usage
Use this command to define the initial retransmission timer.
The value set for sctp-rto-initial should be greater than or equal to the minimum value set with sctp-rto-min (sctp-rto-initial=> sctp-rto-min).
The value set for sctp-rto-initial should be less than or equal to the maximum value set with sctp-rto-max (sctp-rto-initial <= sctp-rto-max).
Example
sctp-rto-initial 240
 
sctp-rto-max
This command sets the maximum retransmission timeout value for the SCTP.
Product
SGSN
Privilege
Security Administrator, Administrator
Syntax
sctp-rto-max value
default sctp-rto-max
default
Resets the system to the sctp-rto-max default of 600 (60 seconds).
value
Set the maximum retransmission timeout value in increments of 100 milliseconds (0.1 seconds) and the value must be an integer between 5 and 1200.
Usage
Use this command to configure the maximum time for retransmissions.
The value set for sctp-rto-max should be greater than or equal to the value set for sctp-rto-initial (sctp-rto-max => sctp-rto-initial).
Example
The following sets the timeout for 45 seconds:
sctp-rto-max 450
 
sctp-rto-min
This command sets the minimum retransmission timeout (RTO) value for the SCTP.
Product
SGSN
Privilege
Security Administrator, Administrator
Syntax
sctp-rto-min [ units-10ms ] value
default sctp-rto-min
default
Resets the sctp-rto-min to the default of 10 (1 second).
units-10ms
Including this keyword, before entering a value, enables configuration with finer granuality - in 10 millisecond units.
value
If the units-10ms keyword is included, then set the timeout in increments of 10 milliseonds. The value must be an integer between 1 and 500.
If the units-10ms keyword is not included then set the timeout in increments of 100 milliseconds. The value must be an integer between 1 and 50.
Usage
Use this command to set the minimum time for retransmission before timeout.
The value set for sctp-rto-min should be less than or equal to the value set for sctp-rto-initial (sctp-rto-min <= sctp-rto-initial)
Example
The following sets the timeout for 2 seconds:
sctp-rto-min 20
 
sctp-sack-frequency
This command sets the frequency of transmission of SCTP selective acknowledgements (SACK).
Product
SGSN
Privilege
Security Administrator, Administrator
Syntax
sctp-sack-frequency [ units-10ms ] value
default sack-frequency
value
Sets the maximum number of datagrams to be received prior to sending a SACK to the peer. The value must be an integer between 1 and 5.
default
Resets the sctp-sack-frequency default value of 2.
Usage
Use this command to set the maximum number of datagrams to be received before a SACK must be sent to the peer. The sctp-sack-frequency is used in conjunction with the sctp-sack-period to control the generation of SACK, depending on which one occurs first.
Example
sctp-sack-frequency 3
 
sctp-sack-period
This command sets the delay before sending an SCTP selective acknowledgement (SACK).
Product
SGSN
Privilege
Security Administrator, Administrator
Syntax
sctp-sack-period [ units-10ms ] value
default sack-period
units-10ms
Including this keyword, before entering a value, enables configuration with finer granuality - in 10 millisecond units.
value
If the units-10ms keyword is included, then set the timeout in increments of 10 milliseonds. The value must be an integer between 0 and 50.
If the units-10ms keyword is not included then set the timeout in increments of 100 milliseconds. The value must be an integer between 0 and 5.
default
Resets the system to the sctp-sack-period default value, 2 (=200 milliseconds).
Usage
Use this command to set the time the SCTP waits to send a SACK.
Example
sctp-sack-period 3
 
sctp-suppress-alarm
This command enables/disables the suppression of alarms for SCTP path failure between two peer endpoints.
Product
SGSN
Privilege
Security Administrator, Administrator
Syntax
[ no ] sctp-suppress-alarm path-failure self-end-point-address orig_ipv4_addresspeer-end-point-address peer_ipv4_address
no
Disables the pre-configured alarm suppression for SCTP path failure.
path-failure
This keyword specifies that the alarm suppression is for SCTP path failure between two peer nodes.
self-end-point-address orig_ipv4_address
This keyword specifies the IP address of the originating endpoint.
orig_ipv4_address is the IP address of originating endpoint in IPv4 dotted decimal notation.
peer-end-point-address peer_ipv4_address
This keyword specifies the IP address of the peer endpoint.
peer_ipv4_address is the IP address of peer endpoint in IPv4 dotted decimal notation.
Usage
Use this command to configure the path failure alarm suppression. This command ignores the alarms generated on SCTP path failure.
Example
The following command suppresses the path failure alarms occurred in SCTP path between originating peer address 1.2.3.4 and peer endpoint 6.7.8.9:
sctp-suppress-alarm path-failure self-end-point-address 1.2.3.4 peer-end-point-address 6.7.8.9
 
timeout
This command sets the times for various timeout timers.
Product
SGSN
Privilege
Security Administrator, Administrator
Syntax
timeout {m3ua-periodic-dest-audit dest_timeout | sctp-bundle bundle_time | sctp-heart-beat hrt_bt_timeout}
default timeout sctp-heart-beat
default
Resets the system to the default value for the SCTP heartbeat interval.
m3ua-periodic-dest-audit dest_timeout
Sets the period (in increments of seconds) between the DAUD messages while auditing a destination state.
dest_timeout: Must be an integer from 1 to 65535. Default is 2.
sctp-bundle bundle_time
Enables SCTP bundling and sets the SCTP bundle timeout value in incremenets of 100 milliseconds. SCTP bundling provides better bandwidth utilization and less traffic, however, there is a 100 millisecond packet transmission delay.
note_smallImportant: Peer end should also be configured to support SCTP bundling.
Default: SCTP bundling is disabled.
bundle_time : Enter an integer from 1 to 65535.
sctp-heart-beat hrt_bt_timeout
Sets the number of seconds in the SCTP heart-beat timer
hrt_bt_timeout: This value is an integer between 1 and 300. Default is 30.
Usage
Use this command to configure timers. Repeat the command with each of the keywords to set values for each.
Example
timeout m3ua-periodic-dest-audit 120
 
 
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