Name: Cisco 2911
Brand: Cisco
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Cisco 3900 Series, Cisco 2900 Series, and Cisco 1900 Series Integrated Services Routers Generation 2 Software Configuration Guide

Chapter Basic Router Configuration

Configuring I/O Memory Allocation

For complete information on global parameter commands, see the Cisco IOS Release configuration

guide documentation set.

Configuring I/O Memory Allocation

To reallocate the percentage of DRAM in use for I/O memory and processor memory on Cisco 3925E

and Cisco 3945E routers, use the memory-size iomem i/o-memory-percentage command in global

configuration mode. To revert to the default memory allocation, use the no form of this command. This

procedure enables smartinit.

Tip We recommend that you configure the memory-size iomem below 25%. Any value above 25% should be

used only for enhancing IPSec performance.

When you specify the percentage of I/O memory in the command line, the processor memory

automatically acquires the remaining percentage of DRAM memory.

Example

The following example allocates 25% of the DRAM memory to I/O memory and the remaining 75% to

processor memory:

Router#config t

Enter configuration commands, one per line. End with CNTL/Z.

Router(config)# memory-size iomem 5

IO memory size too small: minimum IO memory size is 201M

Router(config)#

Router(config)# memory-size iomem ?

<5-50> percentage of DRAM to use for I/O memory: 5, 10, 15, 20, 25, 30, 40, 50

Router(config)# memory-size iomem 25

Smart-init will be disabled and new I/O memory size will take effect upon reload.

Router(config)# end

Step 3

enable secret password

Example:

Router(config)# enable secret cr1ny5ho

Router(config)#

Specifies an encrypted password to prevent

unauthorized access to the router.

Step 4

no ip domain-lookup

Example:

Router(config)# no ip domain-lookup

Router(config)#

Disables the router from translating unfamiliar

words (typos) into IP addresses.

Command Purpose

Syntax Description

i/o-memory-percentage The percentage of DRAM allocated to I/O memory. The values permitted

are 5, 10, 15, 20, 25, 30, 40, and 50. A minimum of 201 MB of memory is

required for I/O memory.

Cisco 2911 Specifications

General

Ethernet LAN	Yes
Cabling technology	10/100/1000Base-T(X)
Networking standards	IEEE 802.1Q, IEEE 802.1ag, IEEE 802.3, IEEE 802.3ab, IEEE 802.3af, IEEE 802.3ah, IEEE 802.3u
Ethernet LAN data rates	10, 100, 1000 Mbit/s
Ethernet interface type	Gigabit Ethernet
DHCP client	-
Routing protocols	BGP, EIGRP, OSPF
Supported protocols	IPv4, IPv6, IS-IS, IGMPv3, PIM SM, SSM, DVMRP, IPSec, GRE, BVD, MPLS, L2TPv3, PPP, MLPPP, MLFR, HDLC, RS-232, RS-449, X.21, V.35, EIA-530, PPPoE, ATM
USB version	2.0
RS-232 ports	1
Expansion slots	4 x EHWIC 2 x DSP 1 x ISM
USB ports quantity	2
Ethernet LAN (RJ-45) ports	3
Firewall security	Cisco IOS
Input current	2.2 A
AC input voltage	100 - 240 V
Power source type	AC
AC input frequency	47 - 63 Hz
Power consumption (typical)	50 W
Product color	Black
Rack capacity	2U
Operating altitude	0 - 4000 m
Non-operating altitude	0 - 4570 m
Storage temperature (T-T)	-40 - 80 °C
Operating temperature (T-T)	0 - 40 °C
Storage relative humidity (H-H)	5 - 95 %
Operating relative humidity (H-H)	5 - 85 %
Safety	UL 60950-1, CAN/CSA C22.2 No. 60950-1, EN 60950-1, AS/NZS 60950-1, IEC 60950-1
Electromagnetic compatibility	47 CFR, ICES-003, EN55022, CISPR22, AS/NZS 3548, VCCI V-3, EN 300-386, EN 61000, EN 55024, CISPR 24EN50082-1