What is the Reason of the STP Overload - How to Investigate an Eagle STP Overload Event

Asset ID:	1-71-2135544.1
Update Date:	2016-05-13
Keywords:

Solution Type Technical Instruction Sure

Solution 2135544.1 : What is the Reason of the STP Overload - How to Investigate an Eagle STP Overload Event

Applies to:

Oracle Communications EAGLE (Software) - Version EAGLE 3x.x and later
Information in this document applies to any platform.

Goal

Due to fire event on Eagle site and the AC power supply outage, Eagle STP was isolated.
The whole traffic has been moved to STP02 and caused overload of DSM and INAP cards.
The STP02 used two E5-SM8G cards which were not able to provide service for the SCCP traffic.
The customer added two additional cards E5-SM4G to increase the traffic capacity.
In a previous SR, we recommended an increase of the reserved TPS for some links.
In order to calculate the TPS quantity required for single STP to be able to process traffic for all their customers, they require an investigation of the overload event.
During the event usage of TPS's reached 30K.
The customer is looking forward to get answers for the below questions:

1. Was the load real?
2. Were there any alerts or alarms on the STP02 which reflected the TPS shortage?
3. Were there any rejects for SCCP messages?
4. Were there any re-transmits etc.?

Solution

1. The SCCP load was real and above the SCCP system capacity : it reached 30093 whereas the maximum for two E5-SM8G-B cards are in your case 6800 TPS x 2 = 13600 TPS.

> rtrv-ctrl-feat

eaglestp 16-03-21 12:32:36 IST EAGLE5 44.0.2-64.34.16
  Feature Name Partnum Status Quantity
  ...
  E5-SM4G Throughput Cap 893019102 on 6800

You would need the control feature "E5-SM4G Throughput Capacity 10K TPS " to have 13600 TPS with the E5-SM8G-B cards.
There is a mix of 2 x E5-SM4G cards and 2 x E5-SM8G-B cards, and your control feature indicates a capacity of 6800 TPS. To take advantage of your E5-SM8G-B cards you would need the control feature at 10K TPS, in order to have 13600 TPS for the E5-SM8G-B cards.
see in the Eagle manual : Database administration manual -> Global Title Translation -> Adding a service module -> Table 34. "SCCP Throughput Capacity"

> rept-stat-sccp

eaglestp 16-03-21 12:32:42 IST EAGLE5 44.0.2-64.34.16
  SCCP SUBSYSTEM REPORT IS-NR Active -----
  SCCP ALARM STATUS = No Alarms
  GFLEX SERVICE REPORT IS-NR Active -----
  GFLEX ALARM STATUS = No Alarms
  MNP SERVICE REPORT IS-NR Active -----
  MNP ALARM STATUS = No Alarms
  INPQ SUBSYSTEM REPORT IS-NR Active -----
  INPQ: SSN STATUS = Allowed MATE SSN STATUS = ----------
  INP ALARM STATUS = No Alarms

  SCCP Cards Configured= 4 Cards IS-NR= 4
  System Daily Peak SCCP Load 30093 TPS 16-03-21 10:52:13
  System Overall Peak SCCP Load 30093 TPS 16-03-21 10:52:13
  System Total SCCP Capacity 27200 TPS (27200 max SCCP Capacity)
  System SCCP Capacity Calc. Method (N)
  System TPS Alarm Threshold 21760 TPS ( 80% System N SCCP Capacity

2. Eagle was issuing several alarms indicating an overload issue like :

- The UAM 0115 : 6046.0115 ** LSN smsrmt0 Linkset IP TPS threshold exceeded
- The UAM 0116 : 6041.0116 * SLK 1317,B15 Link expected IP TPS threshold exceeded
- The UAM 0330 : 7254.0330 ** SCCP SYSTEM System SCCP TPS Threshold exceeded
- The UAM 0437 : 9215.0437 *C SCCP SYSTEM System SCCP TPS capacity exceeded
- The UAM 0453 : 8204.0453 *C SCCP SYSTEM Exceeded Service Error Threshold Lvl 2
  Service: GFLEX

3. Also the commands rept-stat-iptps:lsn=xxxx indicated many linksets in TPS excess compared with the RSVD TPS configuration
> rept-stat-iptps

eaglestp 16-03-23 09:45:26 IST EAGLE5 44.0.2-64.34.16
  IP TPS USAGE REPORT

  THRESH CONFIG/ CONFIG/ TPS PEAK PEAKTIMESTAMP
  RSVD MAX
  --------------------------------------------------------------------------
  LSN
  smsrmt1 100% 400* 3000 TX: 232 1005 16-03-22 12:38:06
  RCV: 300 1217 16-03-22 12:37:07
  ihssrm 100% 6000* 11200 TX: 4142 6838 16-03-22 19:00:07
  RCV: 4144 6782 16-03-22 19:00:07
  smsrmt2 100% 400* 3000 TX: 238 1188 16-03-22 11:36:36
  RCV: 305 1460 16-03-22 11:36:36
  smskat1 100% 400* 3000 TX: 155 845 16-03-22 15:05:37
  RCV: 189 888 16-03-22 15:05:37
  usigrm 100% 200* 500 TX: 24 456 16-03-22 15:03:22
  RCV: 24 449 16-03-22 15:04:36
  smskat2 100% 400* 3000 TX: 146 856 16-03-22 15:05:21
  RCV: 179 895 16-03-22 15:05:21

4. For further analysis, the measurements files are needed

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