Cisco 2901 User Manual

97
Cisco 3900 Series, Cisco 2900 Series, and Cisco 1900 Series Integrated Services Routers Generation 2 Software Configuration Guide
Configuring Backup Data Lines and Remote
Management
Cisco 3900 series, Cisco 2900 series, and Cisco 1900 series integrated services routers (ISRs) support
remote management and backup data connectivity by means of ISDN.
The following sections describe how to configure backup data lines and remote management:
• Configuring Backup Interfaces, page 97
• Configuring Dial Backup and Remote Management Through the Console Port or Auxiliary Port,
page 109
• Configuring Data Line Backup and Remote Management Through the ISDN S/T Port, page 116
• Configuring Third-Party SFPs, page 121
Configuring Backup Interfaces
This section contains the following topics:
• Configuring the Backup Interface, page 97
• Configuring Gigabit Ethernet Failover Media, page 99
• Configuring Cellular Dial-on-Demand Routing Backup, page 101
Configuring the Backup Interface
When the router receives an indication that the primary interface is down, the backup interface is
enabled. After the primary connection is restored for a specified period, the backup interface is disabled.
Note For dial-on-demand routing (DDR) backup, even if the backup interface comes out of standby mode, the
router does not enable the backup interface unless the router receives the traffic specified for that backup
interface.
To configure the router with a backup interface, follow these steps, beginning in global configuration
mode.

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