Cisco Cisco ASR 5000
Engineering Rules
SGSN Connection Rules ▀
SGSN Administration Guide, StarOS Release 18 ▄
SGSN Connection Rules
The following limitations apply to both 2G and 3G SGSNs.
Table 57.
Connection Rules for the SGSN
Features
Limits
Comments
Maximum number of entry
authentication triplets (RAND, SRES,
and KC) and quintuplets stored per
MM context
authentication triplets (RAND, SRES,
and KC) and quintuplets stored per
MM context
5
5 (unused) + 5 (used) Triplets/Quituplets
Maximum number of logically
connected SMSCs
connected SMSCs
no limit
Limit would be based on the number of routes if directly connected. No
limit if GT is used.
limit if GT is used.
Maximum number of logically
connected HLRs
connected HLRs
no limit
Limit would be based on the number of routes if directly connected. No
limit if GT is used.
limit if GT is used.
Maximum number of logically
connected EIRs
connected EIRs
1
SGSN will be connected to only 1 EIR.
Maximum number of logically
connected MSCs
connected MSCs
see
comment
comment
System supports a max of 128 LACs per Gs service and a max of 12 Gs
service.
service.
Maximum number of concurrent PDP
contexts per active user
contexts per active user
11
Maximum number of logically
connected GGSNs per Gn/Gp
interface
connected GGSNs per Gn/Gp
interface
20000
Maximum number of packets buffered
while other engagement
Maximum number of packets buffered
in suspended state
Maximum number of packets buffered
during RAU
while other engagement
Maximum number of packets buffered
in suspended state
Maximum number of packets buffered
during RAU
see
comment
comment
- Minimum of 2KB/subscriber.
- Maximum of 10KB/subscriber -- if buffers are available in the shared
pool*. (*SGSN provides a common buffer pool for 2G and 3G subscribers
of 10M per session manager; buffers to be shared by all subscribers
“belonging” to that session manager.)
- Additional 2G subscriber buffer pool in BSSGP.
- Maximum of 10KB/subscriber -- if buffers are available in the shared
pool*. (*SGSN provides a common buffer pool for 2G and 3G subscribers
of 10M per session manager; buffers to be shared by all subscribers
“belonging” to that session manager.)
- Additional 2G subscriber buffer pool in BSSGP.