Overview

 

This article explains the steps to follow when you need to restart the SS7 links between an RTR and another node when they are down.

 

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Solution

 

You might find SS7 links in a down operational state.

 

[textpass@rtr log]$ m3ua_link
SGP-NAME                  OPSTATE   SCTP-OPSTATE     APC-OPSTATE  VPC-OPSTATE
ITP-A-FTD4_BS_12A         down      cookieWait       inactive     inactive   
STPA_1B_SPC               up        established      active       activating 
STPB_0A_SPC               up        established      active       activating 
STPB_1B_SPC               up        established      active       activating 
STPC_0A_SPC               up        established      active       activating 
STPC_1B_SPC               up        established      active       activating 
STPD_0A_SPC               up        established      active       activating 
STPD_1B_SPC               up        established      active       activating 
ITP-A-FTD4_BS_13B         down      cookieWait       inactive     inactive   
ITP-C-FTD4_BS_12A         up        established      active       activating 
ITP-C-FTD4_BS_13B         up        established      active       activating 
ITP-D-FTD4_BS_12A         up        established      active       activating 
ITP-D-FTD4_BS_13B         up        established      active       activating 
ITP-F-FTD4_BS_13A         down      cookieWait       inactive     inactive   
ITP-F-FTD4_BS_23B         down      cookieWait       inactive     inactive   
STPA_0A_SPC               up        established      active       activating

 

This issue can be solved by restarting the SS7 links. There are two ways of doing this:

1. The SIGTRAN associations will be restarted when the textpass process is restarted. This can be done by stopping and starting the process as a textpass user.
   
   tp_stop --textpass; tp_start --textpass
   
   
2. You can disable and enable the associations individually using the m3ua_link tool, as user textpass.
   
   m3ua_link --disable localhost <association name>
m3ua_link --enable localhost <association name>

 

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