Ethernet Flow Point - Cisco ASR 9000 Series Configuration Manuallines
L2vpn and ethernet services configuration guide
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Also See for ASR 9000 Series:
- Command reference manual (1138 pages) ,
- Routing configuration manual (702 pages) ,
- Reference manual (696 pages)
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The Carrier Ethernet Model
it is much more difficult, and may be impossible, for the service provider to offer value-added Layer 3 services
(this is discussed later in the document).
Ethernet Flow Point
An Ethernet Flow Point (EFP) is a substream partition of a main interface. On Cisco ASR 9000 Series Routers,
the EFP is implemented as an L2 subinterface with an encapsulation statement.
Ethernet Virtual Circuit
An Ethernet Virtual Circuit (EVC) is a point-to-point tunnel. On Cisco ASR 9000 Series Routers, the EVC
is implemented as a pseudowire (PW).
Ethernet OAM Protocols
Ethernet as a Metro Area Network (MAN) or a Wide Area Network (WAN) technology benefits greatly from
the implementation of Operations, Administration and Maintenance (OAM) features. OAM features allow
Service Providers to monitor the quality of the connections on a MAN or WAN. Service providers can monitor
specific events, take actions on events, and if necessary, put specific interfaces into loopback mode for
troubleshooting. Ethernet OAM features can be configured to monitor either side or both sides of a link.
For more information on Ethernet OAM protocols, refer to the Configuring Ethernet Interfaces chapter of the
Interface and Hardware Component Configuration Guide for Cisco ASR 9000 Series Routers.
Layer 2 VPN on Ethernet Interfaces
Layer 2 Virtual Private Network (L2VPN) connections emulate the behavior of a LAN across an IP or
MPLS-enabled IP network, allowing Ethernet devices to communicate with each other as if they were connected
to a common LAN segment.
The L2VPN feature enables service providers (SPs) to provide L2 services to geographically disparate customer
sites. Typically, an SP uses an access network to connect the customer to the core network. This access network
may use a mixture of L2 technologies, such as Ethernet and Frame Relay. The connection between the customer
site and the nearby SP edge router is known as an attachment circuit (AC). Traffic from the customer travels
over this link to the edge of the SP core network. The traffic then tunnels through a pseudowire over the SP
core network to another edge router. The edge router sends the traffic down another AC to the customer's
remote site.
The L2VPN feature enables the connection between different types of L2 attachment circuits and pseudowires,
allowing users to implement different types of end-to-end services.
Cisco IOS XR software supports a point-to-point end-to-end service, where two Ethernet circuits are connected
together. An L2VPN Ethernet port can operate in one of two modes:
• Port Mode—In this mode, all packets reaching the port are sent over the pseudowire, regardless of any
• VLAN Mode—Each VLAN on a CE (customer edge) or access network to PE (provider edge) link can
Switching can take place in three ways:
VLAN tags that are present on the packets. In VLAN mode, the configuration is performed under the
l2transport configuration mode.
be configured as a separate L2VPN connection (using either VC type 4 or VC type 5). To configure
L2VPN on VLANs, see The Carrier Ethernet Model chapter in this manual. In VLAN mode, the
configuration is performed under the individual subinterface.
L2VPN and Ethernet Services Configuration Guide for Cisco ASR 9000 Series Routers, IOS XR Release 6.3.x
Ethernet Flow Point
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