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Dual memory dimms in a Cisco 3845 router

joseph.a.marino
Beginner
Beginner

We still have Cisco 3845 routers in our infrastucture, each router has a single 512 chip. We are starting to have memory chip failures, we have spares and that gets us by but my question is - if I equip a Cisco 3845 with two 512 chips and either chip goes bad will the device continue to operate on the one good 512 chip?

 

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Show Ver:

 

Cisco IOS Software, 3800 Software (C3845-ADVIPSERVICESK9-M), Version 15.0(1)M8.1, MAINTENANCE INTERIM SOFTWARE
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2012 by Cisco Systems, Inc.
Compiled Fri 30-Mar-12 02:50 by prod_rel_team

ROM: System Bootstrap, Version 12.4(13r)T11, RELEASE SOFTWARE (fc1)

XXXXXXXXXXX uptime is 11 weeks, 20 hours, 17 minutes
System returned to ROM by power-on
System restarted at 11:28:02 EST Thu Feb 3 2022
System image file is "flash:c3845-advipservicesk9-mz.150-1.m8.1.bin"
Last reload type: Normal Reload


This product contains cryptographic features and is subject to United
States and local country laws governing import, export, transfer and
use. Delivery of Cisco cryptographic products does not imply
third-party authority to import, export, distribute or use encryption.
Importers, exporters, distributors and users are responsible for
compliance with U.S. and local country laws. By using this product you
agree to comply with applicable laws and regulations. If you are unable
to comply with U.S. and local laws, return this product immediately.

A summary of U.S. laws governing Cisco cryptographic products may be found at:
http://www.cisco.com/wwl/export/crypto/tool/stqrg.html

If you require further assistance please contact us by sending email to
export@cisco.com.

Cisco 3845 (revision 1.0) with 223232K/38912K bytes of memory.
Processor board ID FTX1213A3JM
2 Gigabit Ethernet interfaces
3 Serial interfaces
64 terminal lines
1 Virtual Private Network (VPN) Module
DRAM configuration is 64 bits wide with parity enabled.
479K bytes of NVRAM.
126976K bytes of ATA System CompactFlash (Read/Write)


License Info:

License UDI:

-------------------------------------------------
Device# PID SN
-------------------------------------------------
*0 CISCO3845-MB         XXXXXXXXX

 

Configuration register is 0x2102

1 Accepted Solution

Accepted Solutions

marce1000
VIP
VIP

 

 - No , second chip offers expanding capabilities for memory , not memory-failover.

 M.



-- ' 'Good body every evening' ' this sentence was once spotted on a logo at the entrance of a Weight Watchers Club !

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5 Replies 5

marce1000
VIP
VIP

 

 - No , second chip offers expanding capabilities for memory , not memory-failover.

 M.



-- ' 'Good body every evening' ' this sentence was once spotted on a logo at the entrance of a Weight Watchers Club !

Cannot say with 100% assurance, but as @marce1000 notes, a second memory slot usually would only provide memory expansion, not any kind of memory redundancy.

Further, BTW, as a side note, often additional memory chips have to be "like" what's already installed, i.e. capacity and often, I recall, speed too.

Lastly, besides additional memory capacity, additional memory chips often allow faster access as access can be spread across multiple banks of memory.  (I doubt this feature, if implemented, would make a noticeable difference on most network devices.)

Some systems are designed to use memory chips without any kind of error detection, some are designed to detect basic errors (like a single flipped bit) and some are designed to use error correcting memory (ECC).  Don't recall if any systems are designed to use more than one kind of the forging memory types or what Cisco generally uses in their network platforms.

Thank you both for a quick reply, its appreciated!!

I thought that woudl be the case, thank you for your reply!

balaji.bandi
Hall of Fame
Hall of Fame

i can not remember the how many slots...but the one you looking not going to work.

 

BB

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