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 Configuring Security Features
Configuring Cisco IOS Firewall
For information on configuring and managing access groups, see the “Creating an IP Access List to Filter
IP Options, TCP Flags, Noncontiguous Ports, or TTL Values” section of the “Access Control Lists”
section of Cisco IOS Security Configuration Guide: Securing the Data Plane, Release 12.4T at:
http://www.cisco.com/en/US/docs/ios/sec_data_plane/configuration/guide/12_4t/
sec_data_plane_12_4t_book.html.
Configuring Cisco IOS Firewall
The Cisco IOS Firewall lets you configure a stateful firewall where packets are inspected internally and
the state of network connections is monitored. Stateful firewall is superior to static access lists because
access lists can only permit or deny traffic based on individual packets, not based on streams of packets.
Also, because the Cisco IOS Firewall inspects the packets, decisions to permit or deny traffic can be
made by examining application layer data, which static access lists cannot examine.
To configure a Cisco IOS Firewall, specify which protocols to examine by using the following command
in interface configuration mode:
ip inspect name inspection-name protocol timeout seconds
When inspection detects that the specified protocol is passing through the firewall, a dynamic access list
is created to allow the passage of return traffic. The timeout parameter specifies the length of time that
the dynamic access list remains active without return traffic passing through the router. When the
timeout value is reached, the dynamic access list is removed, and subsequent packets (possibly valid
ones) are not permitted.
Use the same inspection name in multiple statements to group them into one set of rules. This set of rules
can be activated elsewhere in the configuration by using the ip inspect inspection-name { in | out }
command when you configure an interface at the firewall.
For additional information about configuring a Cisco IOS Firewall, see “Cisco IOS Firewall Overview”
at: http://www.cisco.com/en/US/docs/ios/security/configuration/guide/sec_ios_firewall_ov.html.
The Cisco IOS Firewall may also be configured to provide voice security in Session Initiated Protocol
(SIP) applications. SIP inspection provides basic inspection functionality (SIP packet inspection and
detection of pinhole openings), as well protocol conformance and application security. For more
information, see “Cisco IOS Firewall: SIP Enhancements: ALG and AIC” at:
http://www.cisco.com/en/US/docs/ios/security/configuration/guide/sec_sip_alg_aic.html.
Zone-Based Policy Firewall
The Cisco IOS Zone-Based Policy Firewall can be used to deploy security policies by assigning
interfaces to different zones and configuring a policy to inspect the traffic moving between these zones.
The policy specifies a set of actions to be applied on the defined traffic class.
For additional information about configuring zone-based policy firewall, see the “Zone-Based Policy
Firewall” section of Cisco IOS Security Configuration Guide: Securing the Data Plane, Release 12.4T
at:
http://www.cisco.com/en/US/docs/ios/sec_data_plane/configuration/guide/12_4t/
sec_data_plane_12_4t_book.html.

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