Cisco 2911 Configuration Guide

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Cisco 3900 Series, Cisco 2900 Series, and Cisco 1900 Series Integrated Services Routers Generation 2 Software Configuration Guide
Chapter Administering the Wireless Device
Configuring the Access Point for Secure Shell
clear Commands
To clear DHCP server variables, use the commands in Table 5, in privileged EXEC mode.
debug Command
To enable DHCP server debugging, use the following command in privileged EXEC mode:
debug ip dhcp server {events | packets | linkage}
Use the no form of the command to disable debugging for the wireless device DHCP server.
Configuring the Access Point for Secure Shell
This section describes how to configure the Secure Shell (SSH) feature.
Note For complete syntax and usage information for the commands used in this section, see the “Secure Shell
Commands” section in Cisco IOS Security Command Reference for Release 12.4.
Understanding SSH
SSH is a protocol that provides a secure, remote connection to a Layer 2 or Layer 3 device. There are
two versions of SSH: SSH version 1 and SSH version 2. This software release supports both SSH
versions. If you do not specify the version number, the access point defaults to version 2.
SSH provides more security for remote connections than Telnet by providing strong encryption when a
device is authenticated. The SSH feature has an SSH server and an SSH integrated client. The client
supports the following user authentication methods:
• RADIUS (for more information, see the “Controlling Access Point Access with RADIUS” section
on page 305)
• Local authentication and authorization (for more information, see the “Configuring the Access Point
for Local Authentication and Authorization” section on page 328)
For more information about SSH, see Part 5, “Other Security Features” in the Cisco IOS Security
Configuration Guide for Release 12.4.
Table 5 Clear Commands for DHCP Server
Command Purpose
clear ip dhcp binding
{address | *}
Deletes an automatic address binding from the
DHCP database. Specifying the address argument
clears the automatic binding for a specific (client)
IP address. Specifying an asterisk (*) clears all
automatic bindings.
clear ip dhcp conflict
{address | *}
Clears an address conflict from the DHCP
database. Specifying the address argument clears
the conflict for a specific IP address. Specifying
an asterisk (*) clears conflicts for all addresses.
clear ip dhcp server statistics Resets all DHCP server counters to 0.

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