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Cisco 2901 User Manual

Cisco 2901
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16
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.

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Cisco 2901 Specifications

General IconGeneral
Operating altitude0 - 3000 m
Non-operating altitude0 - 4570 m
Storage temperature (T-T)-40 - 70 °C
Operating temperature (T-T)0 - 40 °C
Storage relative humidity (H-H)5 - 95 %
Operating relative humidity (H-H)10 - 85 %
Ethernet LANYes
Cabling technology10/100/1000BASE-T(X)
Networking standardsIEEE 802.1Q, IEEE 802.1ag, IEEE 802.3, IEEE 802.3ab, IEEE 802.3af, IEEE 802.3ah
Ethernet LAN data rates10, 100, 1000 Mbit/s
Ethernet interface typeGigabit Ethernet
DHCP client-
Routing protocolsBGP, EIGRP, OSPF
Supported protocolsIPv4, 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 version2.0
RS-232 ports1
Expansion slots4 x EHWIC 2 x DSP 1 x ISM
Ethernet LAN (RJ-45) ports2
Firewall securityCisco IOS
Input current1.5 A
AC input voltage100 - 240 V
Power source typeAC
AC input frequency47 - 63 Hz
Power consumption (typical)40 W
Product colorBlack
Rack capacity1U
SafetyUL 60950-1, CAN/CSA C22.2 No. 60950-1, EN 60950-1, AS/NZS 60950-1, IEC 60950-1
Flash memory256 MB
Internal memory512 MB
Electromagnetic compatibility47 CFR, ICES-003, EN55022, CISPR22, AS/NZS 3548, VCCI V-3, EN 300-386, EN 61000, EN 55024, CISPR 24EN50082-1
Weight and Dimensions IconWeight and Dimensions
Depth439.4 mm
Width438.2 mm
Height44.5 mm
Weight6100 g

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