Cisco 2911 Configuration Guide

109
Cisco 3900 Series, Cisco 2900 Series, and Cisco 1900 Series Integrated Services Routers Generation 2 Software Configuration Guide
Chapter Configuring Backup Data Lines and Remote Management
Configuring Dial Backup and Remote Management Through the Console Port or Auxiliary Port
Configuring Dial Backup and Remote Management Through the
Console Port or Auxiliary Port
When customer premises equipment, such as a Cisco 3900 series ISR, is connected to an ISP, an IP
address is dynamically assigned to the router, or the IP address is assigned by the router peer through
the centrally managed function. The dial backup feature can be added to provide a failover route in case
the primary line fails. Cisco 3900 series ISRs can use the auxiliary port for dial backup and remote
management.
Figure 1 shows the network configuration used for remote management access and for providing backup
to the primary WAN line.
Figure 1 Dial Backup and Remote Management Through the Auxiliary Port
1 Cisco 3900 series
router
A Main WAN link; primary connection to Internet service provider
2 Modem B Dial backup; serves as a failover link for Cisco 3900 routers when
primary line goes down
3 PC C Remote management; serves as dial-in access to allow changes or
updates to Cisco IOS configurations
82269
A1
3
2
2
C
B
BC
2
Internet
PSTN

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