由於ims-authorization-failed斷開原因增加導致Gx成功率KPI降級的故障排除
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已更新: 2020 年 1 月 7 日
文件 ID:215137
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簡介
本文描述如何解決當增加「ims-authorization-failed」斷開原因時Gx成功率關鍵效能指標(KPI)降低時出現的問題。
必要條件
需求
思科建議您瞭解以下主題：
- 5000/5500的硬體知識
- StarOS
採用元件
本文件所述內容不限於特定軟體和硬體版本。
本文中的資訊是根據特定實驗室環境內的裝置所建立。
文中使用到的所有裝置皆從已清除（預設）的組態來啟動。如果您的網路運作中，請確保您瞭解任何指令可能造成的影響。
背景資訊
縮寫：
| PCRF | 策略和計費規則功能 |
| PGW | 封包資料網路閘道器 |
| CCR | 信用控制請求 |
| CCA | 信用控制答案 |
| 氟氯化碳 | 控制功能虛擬卡 |
| FC | 服務功能虛擬卡 |
| KPI | 關鍵績效指標 |
問題
服務提供商報告一個PGW中的Gx成功率KPI降級，發現斷開原因「ims-authorization-failed」計數器正在增加。
此處，「ims-authorization-failed」斷開原因描述由於IMS授權失敗而斷開的會話總數。
PGW持續報告「ims-authorization-failed」計數器。根據disconnect-reasons統計，「ims-authorization-failed」計數器導致Gx成功率的降低。
1st iteration-
[local]PGW# show session disconnect-reasons verbose | grep -i ims-authorization-failed
Thursday June 13 16:10:39 NZST 2019
..
Disconnect Reason Num Disc Percentage
----------------------------------------------------- ---------- ----------
ims-authorization-failed 59034 1.68225
2nd iteration-
[local]PGW# show session disconnect-reasons verbose | grep -i ims-authorization-failed
Thursday June 13 16:10:59 NZST 2019
..
Disconnect Reason Num Disc Percentage
----------------------------------------------------- ---------- ----------
ims-authorization-failed 59202 1.68181 >>168 counter increased in just 20 sec of span
疑難排解
本節提供的資訊用於解決由於「ims-authorization-failed」斷開原因增加而導致的Gx成功率KPI降低的問題。
已針對故障方案收集監控訂戶跟蹤。
通過分析發現，對於與卡7關聯的這些sessmgr例項，觀察到「ims-authorization-failed」。總的來說，在斷開原因中收到ims-authorization-failed原因。
請參閱故障訂戶跟蹤序列：
CREATE_SESSION_REQUEST消息已從SGW傳送到PGW。
INBOUND>>>>> From sessmgr:102 sessmgr_pgw.c:31631 (Callid 1e283e66) 16:55:07:562 Eventid:141004(3)
[PGW-S5/S2a/S2b]GTPv2C Rx PDU, from 202.73.X.Y:31552 to 202.73.A.B:2123 (262)
TEID: 0x00000000, Message type: EGTP_CREATE_SESSION_REQUEST (0x20)
Sequence Number: 0x18A861 (1615969)
GTP HEADER
Version number: 2
TEID flag: Present
Piggybacking flag: Not present
Message Length: 0x0102 (258)
INFORMATION ELEMENTS
IMSI:
Type: 1 Length: 8 Inst: 0
Value: ABXY01106562064
USER LOCATION INFO:
Type: 86 Length: 13 Inst: 0
Value:
Location type: TAI
MCC: 530
MNC: 01
TAC: 0xA101
Location type: ECGI
MCC: AB0
MNC: XY
ECI: 0x006F902
SERVING NETWORK:
Type: 83 Length: 3 Inst: 0
Value:
MCC: AB0
MNC: XY
RADIO ACCESS TECH:
Type: 82 Length: 1 Inst: 0
Value: EUTRAN (6)
SGW-CONTROL FTEID:
Type: 87 Length: 9 Inst: 0
Value:
Interface: SGW S5/S8-C
IPv4 Flag: 1
IPv6 Flag: 0
Teid: 0x84B8A061
IPV4 Addr: 202.73.X.Y
ACCESS POINT NAME:
Type: 71 Length: 28 Inst: 0
Value: internet.mnc0XY.mcc0AB.gprs
SELECTION MODE:
Type: 128 Length: 1 Inst: 0
Value: MS or network provided APN,subscr verified (0x00)
PDN TYPE:
Type: 99 Length: 1 Inst: 0
Value: IPV4
PDN ADDRESS ALLOC:
Type: 79 Length: 5 Inst: 0
Value:
PDN Type: IPV4
IPV4 Addr: 0.0.0.0
INDICATION:
Type: 77 Length: 6 Inst: 0
Value:
DAF : 0
DTF : 0(Direct tunnel disabled)
HI : 0
DFI : 0
OI : 0
ISRSI: 0(ISR not supported)
ISRAI: 0(ISR not Activated)
SGWCI: 0
SQCI : 0
UIMSI: 0(Authenticated IMSI)
CFSI : 0(F-TEID Change Indication not supported)
CRSI : 0(Location Change Reporting not supported)
PS : 1(Piggybacking feature supported)
PT : 0(GTPv2)
SI : 0
MSV : 0
RetLoc: 0
PBIC: 0
SRNI: 0
S6AF: 0
S4AF: 0
MBMDT: 0
ISRAU: 0
CCRSI: 0(CSG Information Change Reporting mechanism not supported )
CPRAI: 0
ARRL: 0
PPOF: 0
PPON / PPEI: 0
PPSI: 0
CSFBI: 0
CLII: 0
CPSR: 0
UASI: 0
DTCI: 0
BDWI: 0
PCRI: 0
AOSI: 0
AOPI: 0
EPCOSI: 0
CPOPCI: 0
S11TF: 0
PNSI: 0
WPMSI: 0
APN RESTRICTION:
Type: 127 Length: 1 Inst: 0
Value: 0
AGGREGATE MAX BIT RATE:
Type: 72 Length: 8 Inst: 0
Value:
Uplk AMBR: 64000 kbps
Dnlk AMBR: 256000 kbps
PCO:
Type: 78 Length: 32 Inst: 0
Container id: 0x8021 (IPCP)
Container length: 0x10 (16)
Container content:
Conf-Req(0), Pri-DNS=0.0.0.0, Sec-DNS=0.0.0.0
Container id: 0x000D (IPv4-DNS-Server)
Container length: 0x00 (0)
Container content:
DNS Address: Request for IPv4 DNS Address allocation
Container id: 0x000A (IP address allocation via NAS signalling)
Container length: 0x00 (0)
Container content:
IP Address allocation via NAS signalling
Container id: 0x0005 (Bearer Control Mode)
Container length: 0x00 (0)
Container content:
NCQOS BCM Indicator:
Container id: 0x0010 (Link MTU)
Container length: 0x00 (0)
Container content:
BEARER CONTEXT TO BE CREATED:
Type: 93 Length: 44 Inst: 0
Value:
EPS BEARER ID:
Type: 73 Length: 1 Inst: 0
Value: 5
SGW-DATA FTEID:
Type: 87 Length: 9 Inst: 2
Value:
Interface: SGW S5/S8-U
IPv4 Flag: 1
IPv6 Flag: 0
Teid: 0x8A948061
IPV4 Addr: 202.73.X.Y
BEARER QOS:
Type: 80 Length: 22 Inst: 0
Value:
ARP: PCI = 1 (Disabled), PL = 9, PVI = 0 (Enabled)
QCI: 6
Uplnk MBR: 0 kbps
Dnlnk MBR: 0 kbps
Uplnk GBR: 0 kbps
Dnlnk GBR: 0 kbps
UE TIME ZONE:
Type: 114 Length: 2 Inst: 0
Value:
TZ: +12:00
DST: +0 hour
CHARGING CHAR:
Type: 95 Length: 2 Inst: 0
Value: 0x0800
<additional output suprresed>
PGW在EGTP_CREATE_SESSION_RESPONSE消息中向SGW傳送了「無可用資源」。
<<<<OUTBOUND From sessmgr:102 sessmgr_egtp.c:2906 (Callid 1e283e66) 16:55:15:492 Eventid:141005(3)
[PGW-S5/S2a/S2b]GTPv2C Tx PDU, from 202.73.195.91:2123 to 202.73.195.89:31552 (33)
TEID: 0x84B8A061, Message type: EGTP_CREATE_SESSION_RESPONSE (0x21)
Sequence Number: 0x18A861 (1615969)
GTP HEADER
Version number: 2
TEID flag: Present
Piggybacking flag: Not present
Message Length: 0x001D (29)
INFORMATION ELEMENTS
CAUSE:
Type: 2 Length: 2 Inst: 0
Value:
Cause: EGTP_CAUSE_NO_RESOURCES_AVAILABLE (0x49)
PCE: 0
BCE: 0
CS: 0
BEARER CONTEXT CREATED:
Type: 93 Length: 11 Inst: 0
Value:
EPS BEARER ID:
Type: 73 Length: 1 Inst: 0
Value: 5
CAUSE:
Type: 2 Length: 2 Inst: 0
Value:
Cause: EGTP_CAUSE_NO_RESOURCES_AVAILABLE (0x49)
PCE: 0
BCE: 0
CS: 0
總體而言，在斷開原因中收到ims-authorization-failed原因。
***CONTROL*** From sessmgr:102 sessmgr_func.c:5311 (Callid 1e283e66) 16:55:15:493 Eventid:10285 >>disconnect received for sessmr 102
CALL STATS: <xyz12591615@internet>, msid <ABXY01106562064>, Call-Duration(sec): 0
input pkts: 0 output pkts: 0
input bytes: 0 output bytes: 0
input bytes dropped: 0 output bytes dropped: 0
input pkts dropped: 0 output pkts dropped: 0
pk rate from user(bps): 0 pk rate to user(bps): 0
ave rate from user(bps): 0 ave rate to user(bps): 0
sust rate from user(bps): 0 sust rate to user(bps): 0
pk rate from user(pps): 0 pk rate to user(pps): 0
ave rate from user(pps): 0 ave rate to user(pps): 0
sust rate from user(pps): 0 sust rate to user(pps): 0
link online/active percent: 0
ipv4 bad hdr: 0 ipv4 ttl exceeded: 0
ipv4 fragments sent: 0 ipv4 could not fragment: 0
ipv4 input acl drop: 0 ipv4 output acl drop: 0
ipv4 bad length trim: 0
ipv4 input non-mip drop: 0 ipv4 output non-mip drop: 0
ipv4 input css drop: 0 ipv4 output css drop: 0
output gre xoff pkts drop: 0 output gre xoff bytes drop: 0
ipv4 output no-flow drop: 0
ipv4 source violations: 0 ipv4 early pdu drop: 0
ipv4 proxy-dns redirect: 0 ipv4 proxy-dns pass-thru: 0
ipv4 proxy-dns drop: 0 ipv4 proxy-dns redirect tcp connection: 0
ipv6 bad hdr: 0 ipv6 bad length trim: 0
ip source violation no acct: 0 ip source violation ignored: 0
dlnk pkts exceeded bw: 0 dlnk pkts violated bw: 0
uplnk pkts exceeded bw: 0 uplnk pkts violated bw: 0
dormancy total: 0 handoff total: 0
Disconnect Reason: ims-authorization-failed
Last Progress State: IMS Authorizing
此外，sessmgr例項編號是102，其與卡7相關聯，針對卡7接收了ims-authorization-failed計數器。
[local]PGW# show task resources facility sessmgr instance 102
Thursday June 13 16:56:14 NZST 2019
task cputime memory files sessions
cpu facility inst used allc used alloc used allc used allc S status
----------------------- ----------- ------------- --------- ------------- ------
7/0 sessmgr 102 8.80% 100% 792.2M 2.34G 45 500 3097 32504 I good
Total 1 8.80% 792.2M 45 3097
檢查配置時，發現多個diamproxy配置正常。
[local]PGW# show config | grep multiple
Thursday June 13 15:15:11 NZST 2019
require diameter-proxy multiple
然後發現，對於未生成diamproxy功能的卡，觀察到了「ims-authorization-failed」。
在本例中，diamproxy設施未與卡7生成。
[local]PGW# show card table
Thursday June 13 14:53:53 NZST 2019
Slot Card Type Oper State SPOF Attach
----------- -------------------------------------- ------------- ---- ------
1: CFC Control Function Virtual Card Standby -
2: CFC Control Function Virtual Card Active No
3: FC 2-Port Service Function Virtual Card Active No
4: FC 2-Port Service Function Virtual Card Active No
5: FC 2-Port Service Function Virtual Card Active No
6: FC 2-Port Service Function Virtual Card Active No
7: FC 2-Port Service Function Virtual Card Active No
8: FC 2-Port Service Function Virtual Card Active No
9: FC 2-Port Service Function Virtual Card Active No
10: FC 2-Port Service Function Virtual Card Active No
11: FC 2-Port Service Function Virtual Card Active No
12: FC 2-Port Service Function Virtual Card Active No
13: FC 2-Port Service Function Virtual Card Active No
14: FC 2-Port Service Function Virtual Card Active No
15: FC 2-Port Service Function Virtual Card Standby -
16: FC 2-Port Service Function Virtual Card Active No
------- -
[local]PGW# show task resources facility diamproxy all
Thursday June 13 14:55:31 NZST 2019
task cputime memory files sessions
cpu facility inst used allc used alloc used allc used allc S status
----------------------- ----------- ------------- --------- ------------- ------
3/0 diamproxy 8 1.10% 90% 43.75M 250.0M 271 2500 -- -- - good
4/0 diamproxy 9 1.09% 90% 43.89M 250.0M 266 2500 -- -- - good
5/0 diamproxy 10 1.09% 90% 43.93M 250.0M 237 2500 -- -- - good
9/0 diamproxy 1 1.08% 90% 43.63M 250.0M 212 2500 -- -- - good
10/0 diamproxy 4 1.08% 90% 43.88M 250.0M 258 2500 -- -- - good
12/0 diamproxy 11 1.11% 90% 43.93M 250.0M 229 2500 -- -- - good
13/0 diamproxy 2 1.09% 90% 43.75M 250.0M 258 2500 -- -- - good
14/0 diamproxy 7 1.06% 90% 43.88M 250.0M 256 2500 -- -- - good
16/0 diamproxy 13 1.04% 90% 43.89M 250.0M 199 2500 -- -- - good
解決方案
發現儘管卡7處於活動狀態，但並沒有生成卡7的diamproxy設施。為了生成diamproxy設施，需要重新啟動diamctrl設施或執行CF卡切換。
這項行動計畫已按建議得到執行。
使用備用CFC卡切換活動CFC卡。
換卡後，各自的diamproxy已正確生成，Gx KPI根據預期值恢復正常。
******** show card table all *******
Thursday June 13 22:17:54 NZST 2019<tel:2019>
Slot Card Type Oper State SPOF Attach
----------- -------------------------------------- ------------- ---- ------
1: CFC Control Function Virtual Card Active No >>CFC card 1 active post switchover
2: CFC Control Function Virtual Card Standby -
3: FC 2-Port Service Function Virtual Card Active No
4: FC 2-Port Service Function Virtual Card Active No
5: FC 2-Port Service Function Virtual Card Active No
6: FC 2-Port Service Function Virtual Card Active No
7: FC 2-Port Service Function Virtual Card Active No
8: FC 2-Port Service Function Virtual Card Active No
9: FC 2-Port Service Function Virtual Card Active No
10: FC 2-Port Service Function Virtual Card Active No
11: FC 2-Port Service Function Virtual Card Active No
12: FC 2-Port Service Function Virtual Card Active No
13: FC 2-Port Service Function Virtual Card Active No
14: FC 2-Port Service Function Virtual Card Active No
15: FC 2-Port Service Function Virtual Card Standby -
16: FC 2-Port Service Function Virtual Card Active No
--------- -
[local]PGW# show task resources facility diamproxy all
Thursday June 13 14:55:31 NZST 2019
task cputime memory files sessions
cpu facility inst used allc used alloc used allc used allc S status
----------------------- ----------- ------------- --------- ------------- ------
3/0 diamproxy 8 0.95% 90% 43.86M 250.0M 130 2500 -- -- - good
4/0 diamproxy 9 0.98% 90% 44.00M 250.0M 130 2500 -- -- - good
5/0 diamproxy 10 1.00% 90% 44.00M 250.0M 135 2500 -- -- - good
7/0 diamproxy 3 0.26% 90% 43.73M 250.0M 278 2500 -- -- - good >>diamproxy instance 3 spawn with card 7
8/0 diamproxy 5 0.31% 90% 43.73M 250.0M 277 2500 -- -- - good
9/0 diamproxy 1 1.00% 90% 43.86M 250.0M 130 2500 -- -- - good
10/0 diamproxy 4 0.98% 90% 43.96M 250.0M 133 2500 -- -- - good
11/0 diamproxy 6 0.24% 90% 43.74M 250.0M 277 2500 -- -- - good
12/0 diamproxy 11 1.04% 90% 44.01M 250.0M 144 2500 -- -- - good
13/0 diamproxy 2 0.97% 90% 43.84M 250.0M 134 2500 -- -- - good
14/0 diamproxy 7 1.04% 90% 43.99M 250.0M 138 2500 -- -- - good
16/0 diamproxy 13 0.96% 90% 43.74M 250.0M 261 2500 -- -- - good
PGW和PCRF之間交換活動和diameter消息後，產生各自的diamproxy設施。
意見