Cisco 2911 Configuration Guide

8
Cisco 3900 Series, Cisco 2900 Series, and Cisco 1900 Series Integrated Services Routers Generation 2 Software Configuration Guide
Chapter Overview of the Hardware and Software
IOS Commands
IOS Commands
Table 7 lists the Cisco IOS commands and features that can trigger an erase, write, or erase and write
operation on a device's boot flash. The erase or write of an attribute on the boot flash can hold the CPU
for a few milliseconds to complete the operation. The CPU hold can result in a functional impact on
protocols or applications that are extremely time sensitive, for instance, Bidirectional Forwarding
Detection (BFD) or routing protocols which use finely tuned short timers. For example, OSPF with fast
hellos and short dead timers.
Table 7 Cisco IOS Commands
Functionality Command Name Description
Configuration
Example Impact
Write to NV
memory.
write memory This command
writes the device's
configuration in to
the Non-Volatile
RAM (NVRAM)
on the boot flash.
Use this command
in privileged
EXEC mode.
Router#write
memory
A BFD flap is triggered when one of the
following configuration elements are
activated or deactivated and configuration is
saved to memory:
(config)#warm-reboot
(config)#boot config
(config)#boot system
Changing the
configuration
register value.
config-register
value
The router has a
16-bit
configuration
register in
NVRAM. Each bit
has value 1 (on or
set) or value 0 (off
or clear), and each
bit setting affects
the router
behavior upon the
next reload power
cycle. Use this
command in
Global
configuration
mode.
Router(config)#
config-register
0xvalue
Potential enough to flap bfd.

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

Weight and Dimensions

Depth	304.8 mm
Width	438.2 mm
Height	88.9 mm
Weight	8200 g