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Cisco IP Solution Center L2VPN and Carrier Ethernet User Guide, 6.0
Chapter 3 Creating a FlexUNI/EVC Ethernet Policy
Overview of FlexUNI/EVC Support in ISC
As far as Layer 2 access nodes are concerned, configurations on the UNI/NNI of a U-PE and/or PE-AGG
are not influenced by the FlexUNI/EVC capability on the N-PE. However, if a selected named physical
circuit (NPC) with N-PE interface is configured with FlexUNI/EVC, it cannot be provisioned for
traditional configuration. An error will be generated while saving the service request.
On the other hand, if a selected NPC with N-PE interface is configured without FlexUNI, it cannot be
provisioned for FlexUNI configuration. An error will be generated while saving the service request.
For example, if for link one of a FlexUNI/EVC service request, if the encapsulation is selected as dot1Q,
the interface can share other L2 ERS/VPLS ERMS UNIs on the same U-PE/PE-AGG.
If the N-PE interface that is part of the NPC being picked is already configured with non-FlexUNI/EVC
features (using an existing L2VPN or VPLS service request), you cannot configure FlexUNI/EVC on it.
Note If “Dot1Q Tunnel” is selected as the encapsulation type, the port cannot be shared with other services.
IOS XR Platform Support
FlexUNI/EVC services are supported on Cisco ASR 9000 Series Routers running IOS XR 3.7.3 and
The following FlexUNI/EVC features are supported on IOS XR platforms:
• E-line connections. If an ASR 9000 is added on a direct link, only DOT1Q encapsulation is
supported for E-Line services. When using L2 access nodes with NPCs, all supported encapsulations
• E-LAN connections.
• Flexible frame matching.
• Flexible VLAN tag manipulation/translation.
• VLAN scaling and locally significant VLANs.
• The ability to create L2 and L3 services under the same physical interface, restricted only to
• All the Layer 2 ports on Cisco ASR 9000 devices are trunk ports, hence only trunk port-based
configuration is supported.
The following FlexUNI/EVC services are not supported on IOS XR platforms:
• The N-PE Pseudo-wire on SVI attribute is not supported. SVI interfaces are not available on the
devices, which restricts support for Standard UNI and Port Security configuration when the UNI is
configured on an N-PE.
• xconnect commands are not directly supported under interface configuration. Support for these
commands has been moved to different a hierarchy in IOS
• When the UNI is configured on an N-PE device, EWS service is not supported. Since the Cisco
9000 device is a router, all the Layer 2 ports are default trunk. There is no option for
configuring access ports, which restricts support for access port-based services.
Note Unless otherwise noted, all of the FlexUNI/EVC policy and service request features documented in this
guide are applicable for both IOS and IOS XR platforms.