Cisco 2901 User Manual

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.

Cisco 2901 Specifications

General

Operating altitude	0 - 3000 m
Non-operating altitude	0 - 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 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
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
Ethernet LAN (RJ-45) ports	2
Firewall security	Cisco IOS
Input current	1.5 A
AC input voltage	100 - 240 V
Power source type	AC
AC input frequency	47 - 63 Hz
Power consumption (typical)	40 W
Product color	Black
Rack capacity	1U
Safety	UL 60950-1, CAN/CSA C22.2 No. 60950-1, EN 60950-1, AS/NZS 60950-1, IEC 60950-1
Flash memory	256 MB
Internal memory	512 MB
Electromagnetic compatibility	47 CFR, ICES-003, EN55022, CISPR22, AS/NZS 3548, VCCI V-3, EN 300-386, EN 61000, EN 55024, CISPR 24EN50082-1

Weight and Dimensions

Depth	439.4 mm
Width	438.2 mm
Height	44.5 mm
Weight	6100 g