Overview

You need to update one or more SCTP parameter values. You would like to know how to perform this update.

Information

Follow below steps to update SCTP parameter values:

1. Access first Traffic Element (SMSC nodes only, not AGW) as user ROOT.
2. Execute below command to edit file:

   vi /etc/sysctl.d/99-sysctl.conf

3. Add <parameter name> = <value> at the bottom of the file. To update multiple parameters, add a new line for each parameter to be updated. See below examples for reference:

   Examples:
   net.sctp.rto_min = 300 (to set RTOMI to 300)
   net.sctp.rto_max = 1000 (to set RTOMA to 1000)
   net.sctp.rto_initial = 300 (to set RTOI to 300)
   net.sctp.association_max_retrans = 5 (to set AMR to 5)
   net.sctp.path_max_retrans = 3 (to set PMR to 3)
   net.sctp.max_init_retransmits = 8 (to set IMR to 8)
   net.sctp.sack_timeout = 200 (to set TSACK to 200)

4. Save and close the file using wq! command.
5. Run the following command to make changes effective (as user ROOT):
   

   # sysctl -p /etc/sysctl.d/99-sysctl.conf

6. Restart the RTR so that all SCTP associations restart with the new values:
   

   # su - textpass
   $ tp_stop -p ; tp_start -p

7. Check ‘textpass’ (RTR) process is back into service:
   

   $ tp_status

8. Repeat steps 1-7 on every SMSC node where the changes shall be applied.