Cisco Cisco ASR 5000 トラブルシューティングガイド
ASR5500 Series Default Policy Is Not Handed Out
When PCRF Is Down
When PCRF Is Down
Document ID: 119201
Contributed by Abdur Razzaque, Cisco TAC Engineer.
Jul 23, 2015
Contents
Introduction
Problem
Solution
Related Information
Problem
Solution
Related Information
Introduction
This document describes how to handle the default local policy in the Cisco Aggregation Services Router
(ASR) 5500 chassis, in the event of PCRF (Policy Control and Rule Function) failure, when the local default
policy is not configured.
(ASR) 5500 chassis, in the event of PCRF (Policy Control and Rule Function) failure, when the local default
policy is not configured.
Problem
The ASR PGW (Packet Data Gateway) failed to handle the default policy for subscribers when PCRF was
down. In the PCRF upgrade phase, issues were observed on the PCRF. However, the ASR PGW failed to
handle the default policy for subscribers which caused many sessions to be dropped.
down. In the PCRF upgrade phase, issues were observed on the PCRF. However, the ASR PGW failed to
handle the default policy for subscribers which caused many sessions to be dropped.
Wireshark traces indicate that all CCA−I (Credit Control Answer Initial) packets are sent from PCRF with the
Diameter Result−Code "DIAMETER_UNKNOWN_SESSION_ID (5002)" during the incident.
Diameter Result−Code "DIAMETER_UNKNOWN_SESSION_ID (5002)" during the incident.
A sample packet is shown here:
2014−10−01 06:20:00.009092 107.72.199.142 172.18.232.142 DIAMETER 286
[TCP Retransmission] cmd=Credit−ControlAnswer(272) flags=−P−− appl=3GPP
Gx(16777238) h2h=70409850 e2e=4a67829
AVP: CC−Request−Type(416) l=12 f=−M− val=INITIAL_REQUEST (1)
AVP: Result−Code(268) l=12 f=−M− val=DIAMETER_UNKNOWN_SESSION_ID (5002)
From configuration, the ASR does not have the Local Policy fallback configured to 5002 (or 5xxx) codes in
order to perform Failure Handling (FH) for such codes:
order to perform Failure Handling (FH) for such codes:
failure−handling−template FHtemplate
msg−type credit−control−initial failure−type diameter result−code 3000 to 3999
action continue local−fallback
msg−type credit−control−initial failure−type tx−expiry action continue local−fallback
msg−type credit−control−initial failure−type resp−timeout action continue
local−fallback
msg−type credit−control−initial failure−type diabase−error action continue
local−fallback
msg−type credit−control−update failure−type diameter result−code 3000 to 3999 action
continue local−fallback
msg−type credit−control−update failure−type tx−expiry action continue local−fallback