Cisco 2901 User Manual

98
Cisco 3900 Series, Cisco 2900 Series, and Cisco 1900 Series Integrated Services Routers Generation 2 Software Configuration Guide
OL-20696-04
Chapter Configuring Backup Data Lines and Remote Management
Configuring Backup Interfaces
SUMMARY STEPS
1. interface type number
2. backup interface interface-type interface-number
3. backup delay enable-delay disable-delay
4. exit
DETAILED STEPS
Command Purpose
Step 1
interface type number
Example:
Router(config)# interface atm 0/0/0
Router(config-if)#
Enters interface configuration mode for the
interface for which you want to configure backup.
The example shows configuration of a backup
interface for an ATM WAN connection.
Step 2
backup interface interface-type
interface-number
Example:
Router(config-if)# backup interface bri
0/0/1
Router(config-if)#
Assigns an interface as the secondary or backup
interface.
This can be a serial interface or an asynchronous
interface. For example, a serial 1 interface could
be configured to back up a serial 0/2/1 interface.
The example shows a BRI interface configured as
the backup interface for the ATM 0/0/0 interface.
Step 3
backup delay enable-delay disable-delay
Example:
Router(config-if)# backup delay enable
delay
Specifies the delay between the physical interface
going down and the backup interface being
enabled, and the delay between the physical
interface coming back up and the backup interface
being disabled.
Step 4
exit
Example:
Router(config-if)# exit
Router(config)#
Exits configuration interface 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