STP and SGSN communication

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Neels Hofmeyr nhofmeyr at sysmocom.de
Mon Oct 29 15:04:01 UTC 2018


Sorry to see no response here for a whole week.
Have you resolved the issue?

On Mon, Oct 22, 2018 at 04:37:27PM +0200, Lars Prehn wrote:
> Using the VTY interface I can see that only HNBGW and MSC annouced their
> code points towards STP. :
> 
> as-rkm-1     AS_ACTIVE    1          0.23.5
> 
> as-rkm-2     AS_ACTIVE    2          0.23.1

So, you need to get osmo-sgsn to connect to osmo-stp.

My osmo-sgsn.cfg looks like this:

----
sgsn
 gtp local-ip 192.168.2.3
 ggsn 0 remote-ip 192.168.2.4
 ggsn 0 gtp-version 1
 auth-policy remote
 gsup remote-ip 127.0.0.1
ns
 encapsulation udp local-ip 192.168.2.3
 encapsulation udp local-port 23000
 encapsulation framerelay-gre enabled 0
----

i.e. the SS7 config is implicit / default. When I vty 'enable; show
running-config', this implicit cs7 cfg is shown as

----
cs7 instance 1
 point-code 0.23.4
 asp asp-clnt-OsmoSGSN 2905 0 m3ua
  remote-ip 127.0.0.1
 as as-clnt-OsmoSGSN m3ua
  asp asp-clnt-OsmoSGSN
  routing-key 1 0.23.4
----

Not sure if this helps, but I can't see any mistake in your config. Is your
SGSN running on a different machine / network segment and cannot reach the STP
at 127.0.0.1? Then change the remote-ip as shown in the cs7 instace cfg...

~N
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