> 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 through 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
> Specifies the SCTP retransmission timeout beta value as an integer from 0 through 65535. Default: 10
> 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 is an integer from 50 through 1200. The range translates to 5000 milliseconds to 120000 milliseconds, as the granularity 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
> Specifies the maximum number of retransmissions allowed by this template for SCTP associations as an integer from 0 through 255. Default: 10
> 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
> Specifies the maximum number of incoming SCTP streams allowed by the template as an integer from1 through 16. Default: 16
> 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 template to 5:
> sctp-max-in-strms 5
> 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
> Specifies the maximum number of retransmissions of SCTP initiations allowed by the template as an integer from 0 through 255. Default: 5
> 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
> Specifies the maximum MTU size (in bytes) for SCTP streams allowed by the template as an integer from 508 through 65535. Default: 1500
> 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
> Specifies the maximum number of outgoing SCTP streams allowed by the template as an integer from 1 through 16. Default: 16
> 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 template to 5:
> sctp-max-out-strms 5
> 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
> Specifies the maximum number of retransmissions of SCTP paths allowed by the template as an integer from 0 through 255. Default: 5
> 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
> Specifies the minimum MTU size (in bytes) for SCTP streams allowed by the template as an integer from 508 through 65535. Default: 508
> 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
> Specifies the initial time for SCTP RTO as an integer from 1 through 1200. The granularity is in 100ms increments (20 = 2000ms). Default: 30 (3000 milliseconds)
> 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
> Specifies the maximum time for SCTP RTOs allowed by the template as an integer from 50 through 1200. The granularity is in 100ms increments (120 = 12000ms). Default: 600 (60000 milliseconds)
> 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
> Specifies the minimum time for SCTP RTOs allowed by the template as an integer from 1 through 500. The granularity is in 100ms increments (20 = 2000ms). Default: 10 (1000 milliseconds)
> 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
> Specifies the frequency of SCTP selective acknowledgements allowed by the template as an integer from 1 through 20. Default: 2
> 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
> Specifies the period for SCTP selective acknowledgements allowed by the template as an integer from 0 through 5. The granularity is in 100ms increments (3 = 300ms). Default: 2 (200 milliseconds)
> units-10ms value
> Specifies that the integer added as value is to be calculated using 10ms granularity for this command. value is an integer from 0 through 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
> Specifies the start MTU size (in bytes) for SCTP streams allowed by the template as an integer from 508 through 65535. Default: 1500
> 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
> 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 is an integer from 1 through 65535. The granularity is in 100ms increments (10 = 1000ms or 1 second). Default: disabled
> sctp-heart-beat value
> Default: 30 seconds
> Specifies the SCTP heartbeat timeout (in seconds) as an integer from 1 through 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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