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Community Member

Howto increase IO memory on a Cisco 7401 router?


we have a Cisco 7401 router with 512mb of memory. Only 32mb of this is allocated to IO memory. Is there any way to increase how much is allocated to IO memory? We're experiencing problems with IO memory running low but I've not been able to find out how to increase this (searched through CCO and google).

kind regards,


show version from the router:

Cisco Internetwork Operating System Software

IOS (tm) 7400 Software (C7400-JS-M), Version 12.3(5f), RELEASE SOFTWARE (fc1)

Copyright (c) 1986-2005 by cisco Systems, Inc.

Compiled Fri 12-Aug-05 11:37 by ssearch

Image text-base: 0x60008AF4, data-base: 0x61F12000

ROM: System Bootstrap, Version 12.2(4r)B, RELEASE SOFTWARE (fc1)

BOOTLDR: 7400 Software (C7400-KBOOT-M), Version 12.2(1)DX, EARLY DEPLOYMENT RELEASE SOFTWARE (fc1)

bmk_hoved1_r uptime is 2 weeks, 13 hours, 49 minutes

System returned to ROM by reload at 20:21:47 UTC+2 Sun May 20 2007

System restarted at 20:23:54 UTC+2 Sun May 20 2007

System image file is "disk0:c7400-js-mz.123-5f.bin"

Last reload reason: Reload command

cisco 7401ASR (NSE) processor (revision A) with 491520K/32768K bytes of memory.

Processor board ID 74991596

R7000 CPU at 375MHz, Implementation 39, Rev 3.3, 256KB L2, 2000KB L3 Cache

1 slot ASR midplane, Version 2.0

Last reset from power-on

Bridging software.

X.25 software, Version 3.0.0.

SuperLAT software (copyright 1990 by Meridian Technology Corp).

TN3270 Emulation software.

PXF processor tmc is running.

2 FastEthernet/IEEE 802.3 interface(s)

2 Gigabit Ethernet/IEEE 802.3 interface(s)

509K bytes of non-volatile configuration memory.

62720K bytes of ATA PCMCIA card at slot 0 (Sector size 512 bytes).

8192K bytes of Flash internal SIMM (Sector size 256K).

Configuration register is 0x2102


Re: Howto increase IO memory on a Cisco 7401 router?


In the following example, the I/O memory size is set to 60 MB.

Rommon> IOMEM=60



Community Member

Re: Howto increase IO memory on a Cisco 7401 router?

Thank you very much, I'll try this as soon as possible.

kind regards,


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