cellular-infrastructure
/
osmo-gsm-manuals
mirror of https://gerrit.osmocom.org/osmo-gsm-manuals
9
0
Fork 0
Code Releases Activity

cs7-config: Explain that A/Iu/Lb interfaces are reouted via STP 

Change-Id: Iabba390b41b9d2ad9c3975a6e6cc504a56e59d0b
This commit is contained in:
Harald Welte 2020-11-20 16:59:36 +01:00
parent 46f610b3b4
commit 6da11244b0
1 changed files with 11 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

11
common/chapters/cs7-config.adoc
View File

@ -59,6 +59,17 @@ At the time of writing, SCCP/M3UA links involving Osmocom program are:
- IuPS-interface: OsmoHNBGW to OsmoSGSN - IuPS-interface: OsmoHNBGW to OsmoSGSN
- Lb-interface: OsmoSMLC to OsmoBSC - Lb-interface: OsmoSMLC to OsmoBSC
On the SCTP/IP level, those connections are actually all established from
the respective program (BSC, MSC, HNBGW, SGSN, SMLC) to OsmoSTP. Hence,
if you look at the traffic in a protocol analyzer like wireshark, at IP
level, you will see each of those programs establishing an SCTP
association from a random local IP to the well-known SCTP port for M3UA
(2905) at the OsmoSTP.
Those star-connections for M3UA/SCTP then are the transport network for
higher level protocols like SCCP. OsmoSTP then acts as central router
for SCCP-level message exchange between all the connected programs.
=== Connect to STP Instance === Connect to STP Instance
By default, an STP instance is assumed to listen on the default M3UA port By default, an STP instance is assumed to listen on the default M3UA port