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 Ethernet CFM and Y.1731 Performance Monitoring on Layer 3 Interfaces
Ethernet Data Plane Loopback
or
encapsulation dot1q vlan-id second-dot1q inner vlan-id
Step 5 ethernet loopback permit external
Step 6 end
DETAILED STEPS
Command Purpose
Step 1
enable
Example:
Router>enable
Enables the privileged EXEC mode.
Enter your password when prompted.
Step 2
configure terminal
Example:
Router#configure terminal
Enters the global configuration mode.
Step 3
interface gigabitethernet
slot/port.sub-port
Example:
Router(config)#interface
gigabitethernet 0/2.1101
Specifies the subinterface and enters the subinterface
configuration mode.
Step 4
encapsulation dot1q vlan-id
or
encapsulation dot1q vlan-id
second-dot1q inner vlan-id
Example:
Router(config-subif)#encapsulation
dot1q 100
or
Router(config-subif)#encapsulation
dot1q 100 second-dot1q 1101
Defines the encapsulation format as IEEE 802.1Q
(dot1q), and specifies the VLAN identifier.
For double tagging, use the second-dot1q keyword and
the inner vlan-id argument to specify the VLAN tag.
Step 5
ethernet loopback permit external
Example:
Router(config-subif)#ethernet
loopback permit external
Configures Ethernet external loopback on the
subinterface.
Step 6
end
Example:
Router(config-subif)#end
Exits the subinterface configuration mode.

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