Cisco Cisco ASR 5000
Direct Tunnelling for the S4-SGSN
Configuring Direct Tunnel on an S4-SGSN ▀
SGSN Administration Guide, StarOS Release 18 ▄
Configuring Direct Tunnel on an S4-SGSN
Configuration of a GTP-U direct tunnel (DT) requires enabling DT both in a call control profile and for the RNC.
Important:
Direct tunneling must be enabled at both end points to allow direct tunneling for the MS/UE.
Enabling Setup of GTP-U Direct Tunnel
The SGSN determines whether a direct tunnel can be setup and by default the SGSN does not support direct tunnel. The
following configuration enables a GTP-U DT in a call control profile:
following configuration enables a GTP-U DT in a call control profile:
config
call-control-profile <profile_name>
direct-tunnel attempt-when-permitted
end
Enabling Direct Tunnel to RNCs
SGSN access to radio access controllers (RNCs) is configured in the IuPS service. Each IuPS service can include
multiple RNC configurations that determine communications and features depending on the RNC. By default, DT
functionality is enabled for all RNCs.
multiple RNC configurations that determine communications and features depending on the RNC. By default, DT
functionality is enabled for all RNCs.
The following configuration sequence enables DT to a specific RNC that had been previously disabled for direct
tunneling:
tunneling:
config
context <ctxt_name>
iups-service <service_name>
rnc id <rnc_id>
default direct-tunnel
end
Notes:
An IuPS service must have been previously created, and configured.
An RNC configuration must have been previously created within an IuPS service configuration.
Command details for configuration can be found in the Command Line Interface Reference.