Field Notice: FN - 63381 - CRS: CRS-MSC-B, CRS-FP40 boards now use RLDRAM2 due to component EOL - Software Upgrade Recommended

Notice

THIS FIELD NOTICE IS PROVIDED ON AN "AS IS" BASIS AND DOES NOT IMPLY ANY KIND OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTY OF MERCHANTABILITY. YOUR USE OF THE INFORMATION ON THE FIELD NOTICE OR MATERIALS LINKED FROM THE FIELD NOTICE IS AT YOUR OWN RISK. CISCO RESERVES THE RIGHT TO CHANGE OR UPDATE THIS FIELD NOTICE AT ANY TIME.

Revision History

Revision	Publish Date	Comments
1.0	17-Jun-11	Initial Release
10.0	14-Nov-17	Migration to new field notice system
10.1	04-Jun-18	Fixed Broken Image Links

Products Affected

Affected Product ID	Comments
CRS-FP40	SMU required for all FP40 Revision
CRS-FP40=	SMU required for all FP40 Revision
CRS-MSC-B	SMU required for all MSC-B Revision
CRS-MSC-B=	SMU required for all MSC-B Revision

Defect Information

Defect ID	Headline
CSCvf34445	There were no defects filed with this field notice at the time of publication.

Problem Description

CRS-MSC-B(=) and CRS-FP40(=) boards with current FCRAM are transitioned to boards that use RLDRAM2 and a protocol conversion ASIC due to FCRAM component EOL. The change in memory type will not impact functionality, performance, features and scale, as there are no changes in the forwarding or the queuing ASICs. The RLDRAM2 boards are compatible with all IOS-XR software releases that are currently supported for the CRS-MSC-B and CRS-FP40

There is no impact on functionality, however environmental sensors have changed. Hence there is a need for a software fix that is delivered by temperature threshold SMU.

Background

Due to end of life of FCRAM memory used on CRS-MSC-B, CRS-FP40, the FCRAM is replaced with RLDRAM2 memory and a memory protocol 'translation ASIC'. The ASIC is a bridge enabling the replacement of FCRAM memory devices with RLDRAM2 memory devices. This change meets the Customer, Regulatory, and Corporate Compliance Requirements for the CRS Platform.

The MSC data plane ASICs are connected to the new ASIC with an FCRAM protocol interface. The new ASIC translates the FCRAM command, address, and control and drives them out to the RLDRAM2 memory.

Customers on IOS-XR Releases 3.6.1, 3.6.2 will require CAS latency SMU. CAS latency is the delay time between the moment a memory controller tells the memory module to access a particular memory column on a RAM memory module, and the moment the data from given array location is available on the module's output pins. This CAS Latency issue is applicable only to MSC-B board(not FP40) and is fixed by CAS Latency SMU.

Due to new thermal and voltage rail monitoring supported by the board, the environment alarms will be generated and logged in system in absence of mandatory temperature threshold SMU.

Several new diagnostic features and environmental monitoring are added with new translation ASIC on boards and available on IOS-XR and diagnostics images:

1. Voltage display and monitoring will work as expected
2. The overall current from the 48V feed can be read back in system
3. The current per voltage rail can be read back in system
4. Access to the various ASIC registers is available via I2C

Problem Symptom

CRS loaded with IOS-XR 3.6.1, 3.6.2 will exhibit Memory CAS latency issue leading to traffic loss on the CRS-MSC-B or CRS-FP-40 with RLDRAM2 version.

For IOS-XR Releases (3.6.3 or newer), the CRS-MSC-B and CRS-FP-40 boards could detect a thermal or environmental alarm while in operation that would bring down the MSC.

Sample logs are below showing the environmental alarms when boards with RLDRAM2 are installed in router without a SMU.

Workaround/Solution

Please Install and Activate the SMU provided before inserting the MSC-B ( 73-12031-02) and FP40 (73-13079-02) boards. Product shipped from Service Logistics under RMA request may still exhibit this behavior. As a best practise, Cisco recommends installing mandatory SMU on all chassis to support both hardware version. Both versions of the boards are working as expected with mandatory SMUs. Using your Cisco.com userid, use the following table to locate the SMU using Software download SMU URL and select CRS's Product type and IOS-XR version.

Note: SMU are not required for IOS-XR version 4.0.1 and newer. XR3.8.0 SMU is not planned for release, customer must migrate to XR3.8.1 or newer release and apply appropriate SMU based on installed release. XR 3.8.1 and 3.8.4 requires pre-requisite SMU before mandatory SMU are installed. See table below .

Pre-requisite SMUs :

CRS: IOS-XR Release	SMU Id	Description	DDTS	SMU Status
3.8.1	AA03899	Pre-requisite SMU for IOS-XR 3.8.1	CSCte53350	Available
3.8.4	AA04154d	Pre-requisite SMU for IOS-XR 3.8.4d	CSCtg76537d	Availabled

 

Mandatory SMU List:

CRS: IOS-XR Release	SMU Id	Description	DDTS	SMU Status
4.0.0	AA04403	Fix Temperature thresholds on new memory, ASIC boards	CSCtj31386	Available
3.9.2	AA04402	Fix Temperature thresholds on new memory, ASIC boards	CSCtj31386	Available
3.9.1	AA04401	Fix Temperature thresholds on new memory, ASIC boards	CSCtj31386	Available
3.8.4	AA04400	Fix Temperature thresholds on new memory, ASIC boards	CSCtj31386	Available
3.8.3	AA04399	Fix Temperature thresholds on new memory, ASIC boards	CSCtj31386	Available
3.8.2	AA04404	Fix Temperature thresholds on new memory, ASIC boards	CSCtj31386	Available
3.8.1	AA04405	Fix Temperature thresholds on new memory, ASIC boards	CSCtj31386	Available
3.8.0	Not Applicable	Fix Temperature thresholds on new memory, ASIC boards	CSCtj31386	Migrate to XR3.8.1 or newer XR Release, use appropriate XR release SMU above
3.7.1	AA04409	Fix Temperature thresholds on new memory, ASIC boards	CSCtj31386	Available
3.7.0	AA04411	Fix Temperature thresholds on new memory, ASIC boards	CSCtj31386	Available
3.6.3	AA04408	Fix Temperature thresholds on new memory, ASIC boards	CSCtj31386	Available>
3.6.2	AA04407, AA03885	Fix Temperature thresholds on new memory, ASIC boards	CSCtj31386	Available
3.6.1	AA04406; AA03896	Fix Temperature thresholds on new memory, ASIC boards; CAS SMU	CSCtj31386; CSCsm68377	Available
3.6.0	AA04410; AA03897	Fix Temperature thresholds on new memory, ASIC boards; CAS SMU	CSCtj31386; CSCsm68377	Available

 

How To Identify Affected Products

Illustrated below are two methods that can be used to distinguish the different revisions of the CRS-MSC-B, CRS-FP40 a) CLI b)Physical inspection.

A) CLI Method

Note: You must login to CRS router with admin privileges to run the commands.

Information: Your command prompt setting will determine [router-name] shown in example below.

New RLDRAM2 and ASIC Version:

CRS-MSC-B Board:

RP/0/RP0/CPU0:[router-name](admin)#show diag 0/0/*
Thu Mar 4 16:30:38.192 EDT
CARD 0/0/* : Cisco CRS-1 Series Modular Services Card revision B
MAIN: board type 500063
800-31272-02 rev A0
dev 108085
S/N SADnnnnnnnn
PCA: 73-12031-02 rev A0 <--new version MSC-B
PID: CRS-MSC-B
VID: V08 (current set, may change at second ECO release)
CLEI: IPUCALFBAH
ECI: 1783070
CRS-FP40 Board:
RP/0/RP1/CPU0:[router-name]#show diag 0/1/cpu0
Tue Nov 23 18:34:46.634 UTC
CARD 0/1/* : Cisco CRS-1 Series Forwarding Processor 40G
MAIN: board type 500067
800-33824-01 rev A0 
dev N/A
S/N SADnnnnnnn
PCA: 73-13079-02 rev A0 <-- new version FP-40 
PID: CRS-FP40
VID: V05 (current set,may change at second ECO release)
CLEI: IPUCAVDBAF
ECI: 178306

Existing FCRAM Cards:

CRS-MSC-B board:
RP/0/RP1/CPU0:[router name]#sh diag 0/2/*
CARD 0/2/* : Cisco CRS-1 Series Modular Services Card revision B
MAIN: board type 500063
800-27067-03 rev D0
dev N/A
S/N SADnnnnnnnn
PCA: 73-10334-03 rev D0 <--Existing MSC-B
PID: CRS-MSC-B
VID: V01
CLEI: IPUCALFBAA
ECI: 154280

CRS-FP40 Board:

RP/0/RP1/CPU0:bm-msc-r1#show diag 0/7/CPU0
Wed Nov 24 13:42:12.862 EST
CARD 0/7/* : Cisco CRS-1 Series Forwarding Processor 40G
MAIN: board type 500067
800-32677-03 rev A0
dev N/A
S/N SADnnnnnnnn
PCA: 73-12550-03 rev A0 <---Existing FP-40 version
PID: CRS-FP40
VID: V03
CLEI: IPUCAVDBAC
ECI: 174395

B) Physical Cards

Below are few images to identify the boards version, serial number location. PID for board ismoi screen printed on Faceplate.

New RLDRAM2 and ASIC Version

CRS-MSC-B boards:

CRS-FP40 board:

Existing FCRAM version board

CRS-MSC-B board:

CRS-FP40 board:

For More Information

If you require further assistance, or if you have any further questions regarding this field notice, please contact the Cisco Systems Technical Assistance Center (TAC) by one of the following methods:

• Open a service request on Cisco.com
• By email
• By telephone

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