Eagle is experiencing a loss of calls due to a TPS Overload on a few Sigtran linksets

Asset ID:	1-72-2121534.1
Update Date:	2016-04-01
Keywords:

Solution Type Problem Resolution Sure

Solution 2121534.1 : Eagle is experiencing a loss of calls due to a TPS Overload on a few Sigtran linksets

Applies to:

Oracle Communications EAGLE (Software) - Version EAGLE 44.0.2 and later
Information in this document applies to any platform.

Symptoms

Further to the isolation of the mated Eagle, this Eagle is experiencing a few Sigtran linksets overload which leads to MSU discards and impacts the traffic.

Changes

The mated Eagle was isolated

Cause

The RSVD TPS are not properly configured on some linksets
The rept-stat-iptps shows several linksets with some traffic Peaks being sometimes more than the double of the RSVD TPS.

> rept-stat-iptps

eaglestp 16-03-21 12:34:49 IST EAGLE5 44.0.2-64.34.16

THRESH CONFIG/ CONFIG/ TPS PEAK PEAKTIMESTAMP

RSVD MAX

--------------------------------------------------------------------------

LSN

lsn1 100% 400* 3000 TX: 680 985 16-03-21 12:01:06

RCV: 857 1197 16-03-21 12:01:06

lsn2 100% 2000* 11200 TX: 4272 8485 16-03-21 11:44:06

RCV: 4284 8441 16-03-21 11:44:06

...

lsn3 100% 2000* 12000 TX: 3434 7567 16-03-21 11:24:51

RCV: 3486 7824 16-03-21 11:23:37

Solution

Increase the Reserved TPS for the linksets which experienced some overload, according to the cards limitation.

Each card is sharing its TPS capacity among several links, so the traffic has to be monitored to determine the best configuration for each E5-ENET card.

Ex :

> rtrv-ls:lsn=lsn2

eaglestp 16-03-22 16:36:53 IST EAGLE5 44.0.2-64.34.16

L3T SLT GWS GWS GWS

LSN APCN (SS7) SCRN SET SET BEI LST LNKS ACT MES DIS SLSCI NIS

lsn2 06470 none 1 2 no A 4 off off off no off

...

IPSG IPGWAPC GTTMODE CGGTMOD PCT

yes no CdPA no off

ADAPTER RSVDSLKTPS MAXSLKTPS

m3ua 1500 2800

TPSALM LSUSEALM SLKUSEALM

rsvdslktps 100% 80%

...

LOC LINK SLC TYPE ANAME

1315 B2 0 IPSG lsn2assoc1

1215 B2 1 IPSG lsn2assoc2

1318 B2 2 IPSG lsn2assoc3

1218 B2 3 IPSG lsn2assoc4

The 4 x cards 1215, 1218, 1315 and 1318 have to be analyzed to see the TPS they are providing on other links from other linksets.
Each card is sharing its TPS capacity among the various ports configured on the card, for each SLK which may belong to different linksets.

The limitation for an E5-ENET-A card is 5000 TPS
The limitation for an E5-ENE-B card is 6500 TPS, or 9500 TPS if feature “IPSG high throughput” is on.

In the above example of the linkset lsn2, each card is configured with 1500 TPS / 4 = 375 TPS. If we consider an E5-ENET-A card, we have up to 5000 TPS. So it is remaining 4625 TPS less the TPS already reserved for other linksets.

The Eagle STP should be used at a maximum of 40% of traffic. Thereby, in case of failure of the mated node, it will process the 40% of the other node, leading to 80%. An additional 20% has to be considered for the management messages, leading to 100%. This is why 40% is the limit.

=> It means the real traffic amount should be at maximum 40% of the RSVD TPS, which is the guaranteed TPS value.

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