SY觸發器更改策略計數器的AMBR值[QOS]在RAR中丟失

簡介

本文描述如何解決Sy觸發器更改策略計數器的RAR中AMBR值[QOS]缺失問題。

必要條件

需求

思科建議您瞭解以下主題：

• PCRF/CPS
• Diameter協定

採用元件

本文檔中的資訊基於Cisco Policy Suit for PCRF解決方案。

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。

縮寫

PCRF	策略和計費規則功能
OCS	線上計費系統
PGW	封包資料網路閘道器
PB	策略生成器

問題

當您在建立新會話後應用限制（新的策略計數器狀態）時，AMBR值不會應用於傳送到PGW的RAR，只會傳送QCI值。

        QoS-Information:
        Default-EPS-Bearer-QoS:
                QoS-Class-Identifier: 8
        Revalidation-Time: -486962116

問題分析

當您檢視PCRF跟蹤時，可以看到OCS在SLR/SLA交換後立即傳送SNR。

此SNR具有與SLA相同的策略計數器狀態(NoThrottle)值。

處理SNR時，您可以看到PCRF正確載入Unlimited_AMBR表，直到一切正常。

幾分鐘後，一個新的SNR被傳送到PCRF，同時策略計數器狀態改變(應用Throttle1)。 處理此問題時，PCRF不會載入Unlimited_AMBR表，因此不會獲得Throttle1的AMBR值，因此不會傳遞到RAR中的PGW。

以下是來自偵錯日誌的一些片段，用於詳細瞭解上述行為。

在CCR-I期間正確載入CRD表

-------- Debugging Messages --------------------------------
INFO core Tagging message with ID: GX_TGPP
INFO diameter Adding extracted AVP to policy: DiameterMessageAvp [code=QoS-Class-Identifier, value=8]
INFO core Start session triggered
INFO TGPP [Rel9] features supported on session 0001-diamproxy.mod-ggsae01-gx.epc.mnc099.mcc530.3gppnetwork.org;405022273;510802;5f4efc9a-5202
INFO gx Creating new diameter session 0001-diamproxy.mod-ggsae01-gx.epc.mnc099.mcc530.3gppnetwork.org;405022273;510802;5f4efc9a-5202
INFO custrefdata Adding AVP [APN_TABLE/LOGICAL_APN], value: DATA
INFO custrefdata Adding AVP [LOCATION_TABLE/LOCATION_REF], value: HOME
INFO custrefdata Adding AVP [PROFILE_TABLE/PROFILE_ID], value: PROFILE_DATA
INFO custrefdata Adding AVP [QCIREF/QCI], value: 8
INFO custrefdata Adding AVP [Unlimited_AMBR/Throttle3_AMBR_DOWN], value: 20000000
INFO custrefdata Adding AVP [Unlimited_AMBR/Throttle2_AMBR_UP], value: 5000000
INFO custrefdata Adding AVP [Unlimited_AMBR/Throttle6_AMBR_UP], value: 600000000
INFO custrefdata Adding AVP [Unlimited_AMBR/Throttle3_AMBR_UP], value: 20000000
INFO custrefdata Adding AVP [Unlimited_AMBR/Throttle4_AMBR_DOWN], value: 50000000
INFO custrefdata Adding AVP [Unlimited_AMBR/Throttle1_AMBR_DOWN], value: 1200000
INFO custrefdata Adding AVP [Unlimited_AMBR/Throttle2_AMBR_DOWN], value: 5000000
INFO custrefdata Adding AVP [Unlimited_AMBR/Throttle5_AMBR_UP], value: 100000000
INFO custrefdata Adding AVP [Unlimited_AMBR/Throttle6_AMBR_DOWN], value: 600000000
INFO custrefdata Adding AVP [Unlimited_AMBR/Throttle1_AMBR_UP], value: 1200000
INFO custrefdata Adding AVP [Unlimited_AMBR/Throttle5_AMBR_DOWN], value: 100000000
INFO custrefdata Adding AVP [Unlimited_AMBR/Throttle4_AMBR_UP], value: 50000000
INFO auth Success ALLOW_ALL authorization
INFO core Switching credential id to 53099204XXXXXX for session
INFO core domain: mobile
INFO sy Created new Sy diameter session
INFO sy Triggering synchronous SLR Message on sessioniMOD-PCRF01-qns01-1.cluster-MOD1.-Model;1597873954;1029;6862816375560209413
INFO debug-code The Sy Policy Counter Status is : NoThrottle

I在CCR後的最近SNR

在這裡，CRD表載入也是正確的，並且基於從SNR接收的策略計數器來選擇期望的QOS。

-------- Debugging Messages --------------------------------
INFO core Tagging message with ID: SY_V11
INFO core Successful load by key: diameterSessionKey:iMOD-PCRF01-qns01-1.cluster-MOD1.-Model%3B1597873954%3B1029%3B6862816375560209413
INFO custrefdata Adding AVP [APN_TABLE/LOGICAL_APN], value: DATA
INFO custrefdata Adding AVP [LOCATION_TABLE/LOCATION_REF], value: HOME
INFO custrefdata Adding AVP [PROFILE_TABLE/PROFILE_ID], value: PROFILE_DATA
INFO custrefdata Adding AVP [QCIREF/QCI], value: 8
INFO custrefdata Adding AVP [Unlimited_AMBR/Throttle3_AMBR_DOWN], value: 20000000
INFO custrefdata Adding AVP [Unlimited_AMBR/Throttle2_AMBR_UP], value: 5000000
INFO custrefdata Adding AVP [Unlimited_AMBR/Throttle6_AMBR_UP], value: 600000000
INFO custrefdata Adding AVP [Unlimited_AMBR/Throttle3_AMBR_UP], value: 20000000
INFO custrefdata Adding AVP [Unlimited_AMBR/Throttle4_AMBR_DOWN], value: 50000000
INFO custrefdata Adding AVP [Unlimited_AMBR/Throttle1_AMBR_DOWN], value: 1200000
INFO custrefdata Adding AVP [Unlimited_AMBR/Throttle2_AMBR_DOWN], value: 5000000
INFO custrefdata Adding AVP [Unlimited_AMBR/Throttle5_AMBR_UP], value: 100000000
INFO custrefdata Adding AVP [Unlimited_AMBR/Throttle6_AMBR_DOWN], value: 600000000
INFO custrefdata Adding AVP [Unlimited_AMBR/Throttle1_AMBR_UP], value: 1200000
INFO custrefdata Adding AVP [Unlimited_AMBR/Throttle5_AMBR_DOWN], value: 100000000
INFO custrefdata Adding AVP [Unlimited_AMBR/Throttle4_AMBR_UP], value: 50000000
INFO core domain: mobile
INFO Sy client Sending SNA Message on session iMOD-PCRF01-qns01-1.cluster-MOD1.-Model;1597873954;1029;6862816375560209413
INFO debug-code The Sy Policy Counter Status is : NoThrottle
INFO debug-code The Sy Policy Counter Status is : NoThrottle

使用正確的QOS資訊向PGW傳送RAR

Message: com.broadhop.diameter2.messages.DiameterRequestMessage
Application Id: Gx (16777238)
Command Code: Gx_RAR (258)
Dest host: 0001-diamproxy.mod-ggsae01-gx.epc.mnc099.mcc530.3gppnetwork.org
Dest realm: epc.mnc099.mcc530.3gppnetwork.org
Device protocol: GX_TGPP
End to end id: 0 (0x00000000)
Hop by hop id: 0 (0x00000000)
Origin state: 0
Stack name: null
Session-Id: 0001-diamproxy.mod-ggsae01-gx.epc.mnc099.mcc530.3gppnetwork.org;405022273;510802;5f4efc9a-5202
Auth-Application-Id: 16777238
Re-Auth-Request-Type: 0
QoS-Information:
APN-Aggregate-Max-Bitrate-UL: 600000000
APN-Aggregate-Max-Bitrate-DL: 600000000
Default-EPS-Bearer-QoS:
QoS-Class-Identifier: 8
Revalidation-Time: -486962716
============================================================

連續接收的SNR

這裡沒有為Unlimited_AMBR載入CRD表。

-------- Debugging Messages --------------------------------
INFO core Tagging message with ID: SY_V11
INFO core Successful load by key: diameterSessionKey:iMOD-PCRF01-qns02-1.cluster-MOD1.-Model%3B1597874000%3B1089%3B6862816573128705089
INFO custrefdata Adding AVP [APN_TABLE/LOGICAL_APN], value: DATA
INFO custrefdata Adding AVP [LOCATION_TABLE/LOCATION_REF], value: HOME
INFO custrefdata Adding AVP [PROFILE_TABLE/PROFILE_ID], value: PROFILE_DATA
INFO custrefdata Adding AVP [QCIREF/QCI], value: 8
INFO core domain: mobile
INFO Sy client Sending SNA Message on session iMOD-PCRF01-qns02-1.cluster-MOD1.Spark-Model;1597874000;1089;6862816573128705089
INFO debug-code The Sy Policy Counter Status is : Throttle1
INFO debug-code The Sy Policy Counter Status is : Throttle1
INFO debug-code ECGI : 530992xxxxxx
INFO debug-code IMSI : 530992041xxxxxxx
INFO debug-code CGI :
INFO debug-code Next Eval Time: 2020-09-02T10:03:05Z
INFO core domain: mobile
INFO rt Added revalidation time Wed Sep 02 03:13:00 UTC 2020
INFO gx Sending RAR Message on session 0001-diamproxy.mod-ggsae01-gx.epc.mnc099.mcc530.3gppnetwork.org;405022275;511314;5f4efd58-5202

在QOS資訊中不帶AMBR的情況下傳送RAR

預期使用降低QOS值傳送。

Message: com.broadhop.diameter2.messages.DiameterRequestMessage
Application Id: Gx (16777238)
Command Code: Gx_RAR (258)
Dest host: 0001-diamproxy.mod-ggsae01-gx.epc.mnc099.mcc530.3gppnetwork.org
Dest realm: epc.mnc099.mcc530.3gppnetwork.org
Device protocol: GX_TGPP
End to end id: 0 (0x00000000)
Hop by hop id: 0 (0x00000000)
Origin state: 0
Stack name: null
Session-Id: 0001-diamproxy.mod-ggsae01-gx.epc.mnc099.mcc530.3gppnetwork.org;405022275;511314;5f4efd58-5202
Auth-Application-Id: 16777238
Re-Auth-Request-Type: 0
QoS-Information:
Default-EPS-Bearer-QoS:
QoS-Class-Identifier: 8
Revalidation-Time: -486962116
============================================================

此外，還檢查了debug qns日誌，發現由於條件為false CCR，跳過了表

MOD-PCRF01-qns02 MOD-PCRF01-qns02 2020-09-02 02:13:00,740 [pool-108-thread-1] DEBUG c.b.policy.impl.RulesPolicyService - Policy event: Message: com.broadhop.diameter2.messages.DiameterRequestMessage
Application Id: Sy (16777302)
Command Code: Sy_SNR (8388636)
Dest host: mod-pcrf01-lb
Dest realm: epc.mnc099.mcc530.3gppnetwork.org
Device protocol: SY_V11
End to end id: 1874920025 (0x6fc10259)
Hop by hop id: 30806209 (0x01d610c1)
Origin state: 0
Stack name: null
Origin host: sy01.mod02.bumblebee.co.nz
Origin realm: mod02.bumblebee.co.nz
Session-Id: iMOD-PCRF01-qns01-1.cluster-MOD1.Spark-Model;1597873954;1029;6862816375560209413
Auth-Application-Id: 16777238
Policy-Counter-Status-Report:
Policy-Counter-Identifier: THROTTLE
Policy-Counter-Status: Throttle1
Route-Record: sy01.mod02.bumblebee.co.nz
QPS-Internal-Route-Record-Host: mod-dsc02.epc.mnc099.mcc530.3gppnetwork.org
QPS-Internal-Route-Record-Realm: epc.mnc099.mcc530.3gppnetwork.org, no return address

     
     
       . . . . 
     
MOD-PCRF01-qns01 MOD-PCRF01-qns01 2020-09-02 02:13:00,742 [pool-109-thread-1] DEBUG c.b.c.i.CustomerReferenceDataManager - Skipping table Unlimited_AMBR since condition is false CCR

進一步研究PB以理解CRD表負載的行為。

瀏覽提供的SVN轉儲後，可找到此表的此配置：Unlimited_AMBR

此表的啟用條件基於CCR觸發器。

因此，如果您看到此CCR觸發器的內容，則條件為：存在一個Gx直徑會話，命令代碼為272。即，CCR。

因此，如果沒有與CCR對應的表，則不會載入表。即。SNR無權在沒有初始CCR的情況下載入CRD [I或U]

解決方案

為SY會話新增CRD啟用觸發器，並執行新配置的發佈。

發佈此新更改後，進行了多次資料呼叫嘗試，所有嘗試均成功。所有連續的SNR都能夠載入CRD表，並且根據來自Sy的傳入策略計數器更改在RAR中傳送正確的QOS。