• You must be in a user group associated with a task group that includes the proper task IDs. The command
reference guides include the task IDs required for each command.
If you suspect user group assignment is preventing you from using a command, contact your AAA
administrator for assistance.
• Confirm that at least one of these line cards is installed on the router:
• 4-port 10-Gigabit Ethernet (4 x 10 GE) line card
• 8-port 10-Gigabit Ethernet (4 x 10 GE) line card
• 40-port 1-Gigabit Ethernet line card
• You know the interface IP address.
• You know how to apply the specify the generalized interface name with the generalized notation
rack/slot/module/port .
Layer 2 Theory and Standards Adherence
To configure Ethernet interfaces, you must understand these concepts:
Ethernet Technology Overview
Ethernet is defined by the IEEE 802.3 international standard. It enables the connection of up to 1024 nodes
over coaxial, twisted-pair, or fiber-optic cable.
The Cisco ASR 9000 Series Routers support Gigabit Ethernet (1000 Mbps) and 10-Gigabit Ethernet (10 Gbps)
interfaces.
Carrier Ethernet Services
Cisco endorses Metro Ethernet Forum (MEF) Carrier Ethernet (CE) 2.0 services:
• E-LINE: An E-Line is a point-to-point Ethernet service that connects exactly 2 UNIs.
• E-LAN: An E-LAN is a multipoint-to-multipoint service that connects a number of UNIs (2 or more)
providing full mesh connectivity for those sites.
• E-TREE: An E-Tree is a rooted multipoint service that connects a number of UNIs providing sites with
hub and spoke multipoint connectivity.
• E-ACCESS: An E-Access Service is an OVC-based service with at least one UNI OVC End Point and
one ENNI End Point.
When discussing an Ethernet WAN (EWAN), these terminologies should be used:
• CE (customer edge): The customer device connecting to the service provider
• PE (provider edge): The service provider device connecting to the customer
• UNI: The connection between the CE and PE
• AC: The physical or virtual circuit attaching a CE to a PE
• Multiplexed UNI: A UNI supporting multiple VLAN flows
• Pseudowire: A term used to indicate an end-to-end path in a service provider network
L2VPN and Ethernet Services Configuration Guide for Cisco ASR 9000 Series Routers, IOS XR Release 6.3.x
6
The Carrier Ethernet Model
Layer 2 Theory and Standards Adherence
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