Router ISR1 2821 or 2811

flielguera · ‎08-13-2019

Good morning to everybody: A quick question, I have several Router 2800 with IOS 12.4 (24), I want to upgrade to IOS 15.1.4M12, it is possible to do it .. ????, the RAM memory of these routers is 256 MB. Waiting for your answer. Greetings.

luis_cordova · ‎08-13-2019

Hi @flielguera ,

Check this link (End note):

https://www.cisco.com/c/en/us/td/docs/ios/15_1/release/notes/15_1m_and_t/151TFEAT.html

Cisco 2800 Series Integrated Services Routers

Cisco IOS Release 15.1M&T supports the Cisco 2800 series integrated service routers.

Introduction

For detailed information about the Cisco 2800 series integrated service routers, see the documents at the following location:

http://www.cisco.com/en/US/products/ps5854/index.html

Supported Hardware

Cisco IOS Release 15.1M&T supports the following Cisco 2800 series integrated services routers:

Cisco 2801
Cisco 2801C (The Cisco 2801C router is supported in Cisco IOS Release 15.1(1)T1 and later releases.)
Cisco 2811, Cisco 2811 VE
Cisco 2811C (The Cisco 2811C router is supported in Cisco IOS Release 15.1(1)T1 and later releases.)
Cisco 2821
Cisco 2821C (The Cisco 2821C router is supported in Cisco IOS Release 15.1(1)T1 and later releases.)
Cisco 2851

For information about the interfaces and modules for this platform, see the following document:

http://www.cisco.com/en/US/products/ps5854/products_relevant_interfaces_and_modules.html

For additional information about supported hardware for this platform and release, go to the Cisco Feature Navigator home page at the following URL:

http://www.cisco.com/go/cfn

Memory recommendations and feature support information for Cisco IOS Release 15.1M&T are also available through Cisco Feature Navigator.

Note The minimum DRAM to run c2801-adventerprisek9-mz in Cisco IOS Release 15.1M&T is 192 MB.

Regards

Martin L · ‎08-13-2019

Yes, I have couple of those fro my Voice lab; (still have 1 left). I remember upgrading Ram memory to 256 MB to run IOS 15.x. because router did not ran IOS 15 on 128 MB which was original for 12,4