> SCTP Parameter Template Configuration Mode Commands
> This chapter provides information about commands used to configure parameters for Stream Control Transmission Protocol (SCTP) associations. The commands become part of a template that can be associated with services running on the system.
> sctp-alpha
> Configures the SCTP retransmission timeout (RTO) alpha value.
> Product
> MME
> Privilege
> Administrator
> Syntax
> sctp-alpha value
> default sctp-alpha
> default
> Returns the command to its default setting of 5.
> value
> Default: 5
> Specifies the SCTP retransmission timeout alpha value. value must be an integer from 0 to 65535.
> Usage
> Use this command to configure the SCTP RTO alpha value. The RTO alpha value is used in calculating the smoothed round-trip time (SRTT) and the round-trip time variation (RTTVAR) for new round trip time (RTT) measurements.
> Example
> The following command sets the SCTP RTO alpha value to 10:
> sctp-alpha 10
> sctp-alt-accept-flag
> Configures the SCTP alternate accept flag for additional life time for the association.
> Product
> MME
> Privilege
> Administrator
> Syntax
> sctp-alt-accept-flag { disable | enable }
> default sctp-alt-accept-flag
> default
> Returns the command to its default setting of enable.
> disable | enable
> Specifies if the alternate accept flag is enabled or disabled.
> Usage
> Use this command to configure the SCTP alternate accept flag for additional life time for the association.
> Example
> The following command disables the alternate accept flag for the SCTP association:
> sctp-alt-accept-flag disable
> sctp-beta
> Configures the SCTP retransmission timeout (RTO) beta value.
> Product
> MME
> Privilege
> Administrator
> Syntax
> sctp-beta value
> default sctp-beta
> default
> Returns the command to its default setting of 10.
> value
> Default: 10
> Specifies the SCTP retransmission timeout beta value. value must be an integer from 0 to 65535.
> Usage
> Use this command to configure the SCTP RTO beta value. The RTO beta value is used in calculating the smoothed round-trip time (SRTT) and the round-trip time variation (RTTVAR) for new round trip time (RTT) measurements.
> Example
> The following command sets the SCTP RTO beta value to 20:
> sctp-beta 20
> sctp-checksum-type
> Configures the checksum type used to increase the integrity of the SCTP packets during transmission.
> Product
> MME
> Privilege
> Administrator
> Syntax
> sctp-checksum-type { adler32 | crc32 }
> default sctp-checksum-type
> default
> Returns the command to its default setting of CRC32.
> adler32 | crc32
> Specifies the type of checksum used to increase data integrity of SCTP packets.
> adler32: Specifies that the Adler-32 checksum algorithm is used to increase data integrity for SCTP packets.
> crc32: Specifies that a 32-bit cyclic redundancy check is used to increase data integrity of SCTP packets.
> Usage
> Use this command to select the checksum for data integrity of SCTP packets.
> Example
> The following command enables the Adler-32 checksum algorithm used to increase data integrity of SCTP packets:
> sctp-checksum-type adler32
> sctp-cookie-life
> Configures the lifetime of the SCTP cookie.
> Product
> MME
> Privilege
> Administrator
> Syntax
> sctp-cookie-life value
> default sctp-cookie-life
> default
> Returns the command to its default setting of 600 (60000 milliseconds).
> value
> Default: 600 (60000 milliseconds)
> Specifies the lifetime of the SCTP cookie. value must be an integer from 50 to 1200. The range translates to 5000 milliseconds to 120000 milliseconds as the granularity of the value variable is in 100 millisecond increments.
> Usage
> Use this command to configure the lifetime of the SCTP cookie.
> Example
> The following command configures the lifetime of the SCTP cookie to 80000 milliseconds:
> sctp-cookie-life 800
> sctp-max-assoc-retx
> Configures the maximum number of retransmissions for SCTP associations.
> Product
> MME
> Privilege
> Administrator
> Syntax
> sctp-max-assoc-retx value
> default sctp-max-assoc-retx
> default
> Returns the command to its default setting of 10.
> value
> Default: 10
> Specifies the maximum number of retransmissions allowed by this template for SCTP associations. value must be an integer from 0 to 255.
> Usage
> Use this command to configure the maximum number of retransmissions allowed by this template for SCTP associations.
> Example
> The following command configures the maximum number of retransmissions to 7:
> sctp-max-assoc-retx 7
> sctp-max-in-strms
> Configures the maximum number of incoming SCTP streams allowed by the template.
> Product
> MME
> Privilege
> Administrator
> Syntax
> sctp-max-in-strms value
> default sctp-max-in-strms
> default
> Returns the command to its default setting of 16.
> value
> Default: 16
> Specifies the maximum number of incoming SCTP streams allowed by the template. value must be an integer from1 to 65535.
> Usage
> Use this command to configure the maximum number of incoming SCTP streams allowed by the template.
> Example
> The following command configures the maximum number of incoming SCTP streams allowed by the temple to 32:
> sctp-max-in-strms 32
> sctp-max-init-retx
> Configures the maximum number of retransmissions of SCTP initiations allowed by the template.
> Product
> MME
> Privilege
> Administrator
> Syntax
> sctp-max-init-retx value
> default sctp-max-init-retx
> default
> Returns the command to its default setting of 5.
> value
> Default: 5
> Specifies the maximum number of retransmissions of SCTP initiations allowed by the template. value must be an integer from 0 to 255.
> Usage
> Use this command to configure the maximum number of retransmissions of SCTP initiations allowed by the template.
> Example
> The following command configures the maximum number of retransmissions of SCTP initiations allowed by the template to 10:
> sctp-max-init-retx 10
> sctp-max-mtu-size
> Configures the maximum transmission unit (MTU) size, in bytes, for SCTP streams allowed by the template.
> Product
> MME
> Privilege
> Administrator
> Syntax
> sctp-max-mtu-size bytes
> default sctp-max-mtu-size
> default
> Returns the command to its default setting of 1500 bytes.
> bytes
> Default: 1500
> Specifies the maximum MTU size, in bytes, for SCTP streams allowed by the template. bytes must be an integer value from 508 to 65535.
> Usage
> Use this command to configure the maximum MTU size, in bytes, for SCTP streams allowed by the template.
> Example
> The following command configures the maximum MTU size for SCTP streams allowed by the template to 3000:
> sctp-max-mtu-size 3000
> sctp-max-out-strms
> Configures the maximum number of outgoing SCTP streams allowed by the template.
> Product
> MME
> Privilege
> Administrator
> Syntax
> sctp-max-out-strms value
> default sctp-max-out-strms
> default
> Returns the command to its default setting of 16.
> value
> Default: 16
> Specifies the maximum number of outgoing SCTP streams allowed by the template. value must be an integer from1 to 65535.
> Usage
> Use this command to configure the maximum number of outgoing SCTP streams allowed by the template.
> Example
> The following command configures the maximum number of outgoing SCTP streams allowed by the temple to 32:
> sctp-max-out-strms 32
> sctp-max-path-retx
> Configures the maximum number of retransmissions of SCTP paths allowed by the template.
> Product
> MME
> Privilege
> Administrator
> Syntax
> sctp-max-path-retx value
> default sctp-max-path-retx
> default
> Returns the command to its default setting of 5.
> value
> Default: 5
> Specifies the maximum number of retransmissions of SCTP paths allowed by the template. value must be an integer from 0 to 255.
> Usage
> Use this command to configure the maximum number of retransmissions of SCTP paths allowed by the template. An SCTP path is a connection between an endpoint address and a peer endpoint address.
> Example
> The following command configures the maximum number of retransmissions of SCTP paths allowed by the template to 10:
> sctp-max-path-retx 10
> sctp-min-mtu-size
> Configures the minimum maximum transmission unit (MTU) size, in bytes, for SCTP streams allowed by the template.
> Product
> MME
> Privilege
> Administrator
> Syntax
> sctp-min-mtu-size bytes
> default sctp-min-mtu-size
> default
> Returns the command to its default setting of 508 bytes.
> bytes
> Default: 508
> Specifies the minimum MTU size, in bytes, for SCTP streams allowed by the template. bytes must be an integer value from 508 to 65535.
> Usage
> Use this command to configure the minimum MTU size, in bytes, for SCTP streams allowed by the template.
> Example
> The following command configures the minimum MTU size for SCTP streams allowed by the template to 1000:
> sctp-min-mtu-size 1000
> sctp-rto-initial
> Configures the initial time for SCTP retransmission timeouts (RTOs) allowed by the template.
> Product
> MME
> Privilege
> Administrator
> Syntax
> sctp-rto-initial value
> default sctp-rto-initial
> default
> Returns the command to its default setting of 30 (3000 milliseconds).
> value
> Default: 30 (3000 milliseconds)
> Specifies the initial time for SCTP RTO. value must be an integer from 1 to 1200. The granularity for value is in 100ms increments (20 = 2000ms).
> Usage
> Use this command to configure the initial time for SCTP RTOs allowed by the template.
> Example
> The following command configures the initial SCTP RTO to 6000ms:
> sctp-rto-initial 60
> sctp-rto-max
> Configures the maximum time for SCTP retransmission timeouts (RTOs) allowed by the template.
> Product
> MME
> Privilege
> Administrator
> Syntax
> sctp-rto-max value
> default sctp-rto-max
> default
> Returns the command to its default setting of 600 (60000 milliseconds).
> value
> Default: 600 (60000 milliseconds)
> Specifies the maximum time for SCTP RTOs allowed by the template. value must be an integer from 50 to 1200. The granularity for value is in 100ms increments (120 = 12000ms).
> Usage
> Use this command to configure the maximum time for SCTP RTOs allowed by the template.
> Example
> The following command configures the maximum time for SCTP RTOs allowed by the template to 120000ms:
> sctp-rto-max 120
> sctp-rto-min
> Configures the minimum time for SCTP retransmission timeouts (RTOs) allowed by the template.
> Product
> MME
> Privilege
> Administrator
> Syntax
> sctp-rto-min value
> default sctp-rto-min
> default
> Returns the command to its default setting of 10 (1000 milliseconds).
> value
> Default: 10 (1000 milliseconds)
> Specifies the minimum time for SCTP RTOs allowed by the template. value must be an integer from 1 to 500. The granularity for value is in 100ms increments (20 = 2000ms).
> Usage
> Use this command to configure the minimum time for SCTP RTOs allowed by the template.
> Example
> The following command configures the minimum time for SCTP RTOs allowed by the template to 2000ms:
> sctp-rto-min 20
> sctp-sack-frequency
> Configures the frequency of SCTP selective acknowledgements allowed by the template.
> Product
> MME
> Privilege
> Administrator
> Syntax
> sctp-sack-frequency value
> default sctp-sack-frequency
> default
> Returns the command to its default setting of 2.
> value
> Default: 2
> Specifies the frequency of SCTP selective acknowledgements allowed by the template. value must be an integer from 1 to 20.
> Usage
> Use this command to configure the frequency of SCTP selective acknowledgements allowed by the template.
> Example
> The following command configures the frequency of SCTP selective acknowledgements allowed by the template to 10:
> sctp-sack-frequency 10
> sctp-sack-period
> Configures the period for SCTP selective acknowledgements allowed by the template.
> Product
> MME
> Privilege
> Administrator
> Syntax
> sctp-sack-period { value | units-10ms value }
> default sctp-sack-period
> default
> Returns the command to its default setting of 2 (200 milliseconds).
> value
> Default: 2 (200 milliseconds)
> Specifies the period for SCTP selective acknowledgements allowed by the template. value must be an integer from 0 to 5. The granularity for value is in 100ms increments (3 = 300ms).
> units-10ms value
> Specifies that the integer added as value is to be calculated using 10ms granularity for this command. value must be an integer from 0 to 50.
> Usage
> Use this command to configure the period for SCTP selective acknowledgements allowed by the template.
> Example
> The following command configures the period for SCTP selective acknowledgements allowed by the template to 400ms (using the 10ms granularity):
> sctp-sack-period units-10ms 40
> sctp-start-mtu-size
> Configures the start maximum transmission unit (MTU) size, in bytes, for SCTP streams allowed by the template.
> Product
> MME
> Privilege
> Administrator
> Syntax
> sctp-start-mtu-size bytes
> default sctp-start-mtu-size
> default
> Returns the command to its default setting of 1500 bytes.
> bytes
> Default: 1500
> Specifies the start MTU size, in bytes, for SCTP streams allowed by the template. bytes must be an integer value from 508 to 65535.
> Usage
> Use this command to configure the start MTU size, in bytes, for SCTP streams allowed by the template.
> Example
> The following command configures the start MTU size for SCTP streams allowed by the template to 3000:
> sctp-start-mtu-size 3000
> timeout
> Configures timeouts for SCTP data chunk bundle transmissions and/or SCTP heartbeat request responses.
> Product
> MME
> Privilege
> Administrator
> Syntax
> timeout { sctp-bundle value | sctp-heart-beat value }
> [ default | no ] timeout { sctp-bundle | sctp-heart-beat }
> default
> Returns the command to its default setting of disabled for sctp-bundle and 30 seconds for sctp-heart-beat.
> no
> Removes the selected configuration.
> sctp-bundle value
> Default: disabled
> Specifies that SCTP data chunks are to be queued until this timer expires at which time the data chunks are bundled and committed for transmission. value must be an integer from 1 to 65535. The granularity for value is in 100ms increments (10 = 1000ms or 1 second).
> sctp-heart-beat value
> Default: 30 seconds
> Specifies the SCTP heartbeat timeout in seconds. value must be an integer from 1 to 300. An SCTP heartbeat is sent o a peer to determine reachability. If an acknowledgement is not received before this timer runs out, heartbeat requests are no longer sent and the peer is considered unreachable.
> Usage
> Use this command to configure timeouts for SCTP data chunk bundle transmissions and/or SCTP heartbeat request responses.
> Example
> The following command enables the SCTP data chunk bundle timeout value and configures it to 2 seconds:
> timeout sctp-bundle 20

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