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SGSN Changes in Release 15.0
SGSN Enhancements for March 31, 2014 ▀
Cisco ASR 5x00 Release Change Reference ▄
485
Important:
This new configuration functionality is not available for the Gn interface
Command Changes
rau-inter
A new CLI keyword
avoid-s12-direct-tunnel
enables the operator to modify the Call-Control profile default
configuration and instructs the SGSN to avoid establishment of a Direct Tunnel for S12 interfaces.
configure
call-control-profile profile_name
rau-inter avoid-s12-direct-tunnel
[ default | remove ] rau-inter avoid-s12-direct-tunnel
end
Notes:
Configuring this keyword will be ignored for Gn interfaces.
default
disables this new functionality and returns the profile’s configuration to the default functionality to
automatically establish a direct tunnel when DT functionality is enabled in the Call-Control profile
configuration.
configuration.
remove
erases the
S12 Direct Tunnel on Inter SGSN RAU
line from the Call-Control profile
configuration and returns the functionality to the default.
Performance Indicator Changes
show s4-sgsn statistics
A new counter has been added to indicate the number of PDPs setup during SGSN RAU that have not had direct tunnels
established due to the ‘avoid’ configuration.
established due to the ‘avoid’ configuration.
3G S4 PDPs with direct tunnel avoided during new SGSN RAU
CSCum52817 - Do Not establish RAB even if ASI bit is set
Feature Changes
Ignoring ASI bit when Establishing RAB during RAU-based Handover
Previous and Current Behavior: By default, the SGSN uses the ASI bit in SGSN Context Response to establish RAB
during a RAU-based handover.
during a RAU-based handover.
New Behavior: The operator can modify the SGSN service configuration to override the default behavior and
configure the SGSN to ignore the ASI bit in the SGSN Context Response during RAU-based handovers, and to ignore
establishing a RAB for any PDPs.
configure the SGSN to ignore the ASI bit in the SGSN Context Response during RAU-based handovers, and to ignore
establishing a RAB for any PDPs.