Preview Tool

Cisco Bug: CSCul39674 - Fabric link retrain between typhoon and RSP440 (RX)

Last Modified

May 28, 2020

Products (7)

  • Cisco ASR 9000 Series Aggregation Services Routers
  • Cisco ASR 9922 Router
  • Cisco IOS XR Software
  • Cisco ASR 9010 Router
  • Cisco ASR 9006 Router
  • Cisco ASR 9001 Router
  • Cisco ASR 9912 Router

Known Affected Releases


Description (partial)

If following syslog is seen then customer might be hitting this issue.  Below syslog is very high-level. To confirm whether asr9k is hitting this issue, please check the steps mentioned in "Conditions" section. 

In 4.2.x 
RP/0/RSP0/CPU0:Nov 21 15:00:17.099 UTC: pfm_node_rp[358]: %PLATFORM-DIAGS-3-PUNT_FABRIC_DATA_PATH_FAILED : Set|online_diag_rsp[233591]|System Punt/Fabric/data Path Test(0x2000004)|failure threshold is 3, (slot, NP) failed: (0/1/CPU0, 0) (0/1/CPU0, 1) (0/1/CPU0, 2) (0/1/CPU0, 3) (0/1/CPU0, 4) (0/1/CPU0, 5) (0/1/CPU0, 6) 
4.3.2 and greater:
FABMGR[222]: %PLATFORM-FABMGR-5-FABRIC_TRANSIENT_FAULT :  Fabric backplane crossbar link underwent link retraining to recover from a transient error: Physical slot 1

Issue is due to fabric retrain in LC ==> RSP direction (RX to RSP). 

Collect ltraces from RSP's and LC to confirm whether there was fabric-retrain. All 3 lines of output should match.

Example log:
RP/0/RSP0/CPU0:asr9k#show controllers fabric ltrace crossbar location 0/RSP0/CPU0 | in retrain [or 0/RSP1/CPU0]
         Nov 21 14:57:17.494 crossbar 0/RSP0/CPU0 t1 init xbar_trigger_link_retrain: destslot:4 fmlgrp:3 rc:0
         Nov 21 14:57:17.494 crossbar 0/RSP0/CPU0 t1 detail xbar_pfm_alarm_callback: xbar_trigger_link_retrain(): (4,1,0) initiated
         Nov 21 14:57:17.499 crossbar 0/RSP0/CPU0 t1 detail xbar_fmlc_handle_link_retrain: rcvd link_retrain for (4,1,0),(1,1,0),0 <=== Indicates RSP is receiving fabric retrain from LC in slot 1. See below for slot mapping info

slot matching: [In the above output slot 1 is logical. Below data shows how to match logical-to-physical slot mapping
Chassis Type : 9010

Physical-Slot             Logical-slot
0                                0
1                                1
2                                2
3                                3
4                                RSP
5                                RSP
6                                4
7                                5
8                                6
9                                7

Related Community Discussions

SMU Manager v2 (AKA CSMv2) and Service Packs (SP)
Are you tried of SMU management? Working out the Pre-requistes and Supersede list of a SMU? Do you want a simple tool which does complete software management on XR platforms? Do you want in app downloads of your SMUs so you don't need to search for them on CCO? Do you want a simple view of all the SMUs and SPs available, their impact, the functions they touch? CSMv2 is your tool, it's a complete end-2-end software management application for all XR platforms, download it and start using it now:;flowid=2138&amp;softwareid=284777134&amp;release=2.0&amp;relind=AVAILABLE&amp;rellifecycle=&amp;reltype=latest ...
Latest activity: May 28, 2014
Bug details contain sensitive information and therefore require a account to be viewed.

Bug Details Include

  • Full Description (including symptoms, conditions and workarounds)
  • Status
  • Severity
  • Known Fixed Releases
  • Related Community Discussions
  • Number of Related Support Cases
Bug information is viewable for customers and partners who have a service contract. Registered users can view up to 200 bugs per month without a service contract.