Руководство По Обслуживанию для Cisco Cisco Packet Data Gateway (PDG)
Generally Available 06-30-2010
SGSN Features in Release 8.1
1-57
Hard Disk Storage for CDR Files
A hard disk has been introduced in the ST40 platform to add storage capability. When
storing CDR files on the SMC hard disk, first they are stored on RAMFS before they are
moved to the hard disk and then they can be off-loaded via ftp or sftp to an external server
(such as the L-ESS or the GSS) or billing system. For additional support information, see
storing CDR files on the SMC hard disk, first they are stored on RAMFS before they are
moved to the hard disk and then they can be off-loaded via ftp or sftp to an external server
(such as the L-ESS or the GSS) or billing system. For additional support information, see
.
●
Use the new command
gtpp storage-server local file {local | remote }
command in GTPP Group Configuration Mode to configure and enable hard disk usage.
●
Use the new show/clear commands
{ show | clear } gtpp storage-server local
file { counter | statistics }
in the Exec Mode to monitor/clear the file counters
and statistics on the hard disk.
●
Use the new
gtpp ram-disk-limit
and
gtpp compression-process
commands in the
Global Configuration Mode to allocate RAM for files and the number of compression
process to support the hard disk functionality.
process to support the hard disk functionality.
IuFlex / SGSN Pooling
The SGSN supports 2G Gb Flex with SGSN Pooling and now 3G Iu Flex with SGSN
Pooling as an orderable feature.
Pooling as an orderable feature.
Iu Flex and SGSN Pooling functionality has been implemented according to 3GPP
TS23.236. The SGSN supports pooling for both 3G and 2G accesses, both as separate pools
and as dual-access pools.
TS23.236. The SGSN supports pooling for both 3G and 2G accesses, both as separate pools
and as dual-access pools.
IuFlex works by defining NRIs in the SGSN service and configuring RNCs as pooled.
Pooled RNCs will be able to co-exist with RNCs that are connected to only one SGSN.
Pooled RNCs will be able to co-exist with RNCs that are connected to only one SGSN.
Iu Flex offloading is also enabled via configuration. This implementation allows carriers to
load balance sessions among pooled SGSNs; where Iu Flex provides carriers deterministic
failure recovery.
load balance sessions among pooled SGSNs; where Iu Flex provides carriers deterministic
failure recovery.
Additional benefits of Iu Flex include:
●
Enables geographical redundancy, as a pool can be distributed across sites.
●
Increases overall capacity, as load sharing across the SGSNs in a pool is possible.
●
Reduces signaling load as well as data transfer due to conversion of inter-SGSN RAUs
to intra-SGSN RAUs for moves between RAs controlled by the same pool.
to intra-SGSN RAUs for moves between RAs controlled by the same pool.
●
Simplifies introduction of new nodes and replacement of old nodes as subscribers can be
moved in a planned manner to new nodes.
moved in a planned manner to new nodes.
●
Eliminates single point of failure between an RNC/BSS and SGSN.
●
Enables service downtime for maintenance scheduling.