•
Only one trunk EFP can be configured under one port or interface.
•
All features configured on a trunk EFP (other than encapsulations and bridge-domain assignments) are
applied uniformly to all VLANs and bridge domains. If a feature requires VLAN-specific or
bridge-domain-specific configuration values, the feature cannot be applied on the trunk EFP. Those
special VLANs or bridge domains must be removed from the EFP trunk to form individual EFPs.
Information About Trunk EFP Support
Benefits of Trunk EFP Support
The Carrier Ethernet infrastructure supports the following types of Ethernet flow points (EFPs):
•
Static EFPs that are user-configurable.
•
Dynamic EFPs that are created and maintained during a Cisco Intelligent Services Gateway ( ISG)
session.
With this feature, a new EFP type has been added that is intended for use on a trunk port.
A trunk port allows a range of VLANs to be forwarded on a given interface while maintaining data-plane
segmentation between the VLANs.
Trunk EFP (with or without port channel) supports encapsulation of up to 1000 VLANs.
Note
Like a static EFP, this new type of EFP is user-configurable via the
service instance trunk
command, the
encapsulation
command, and the
bridge-domain from-encapsulation
command when the Trunk EFP
Support feature is enabled.
Ethernet Flow Points
An Ethernet flow point (EFP) is a forwarding decision point in the provider edge (PE) router, which gives
network designers flexibility to make many Layer 2 flow decisions within the interface. Many EFPs can be
configured on a single physical port. (The number varies from one device to another.) EFPs are the logical
demarcation points of an Ethernet virtual connection (EVC) on an interface. An EVC that uses two or more
user network interfaces (UNIs) requires an EFP on the associated ingress and egress interfaces of every device
that the EVC passes through.
EFPs can be configured on any Layer 2 traffic port; however, they are usually configured on UNI ports. The
following parameters (matching criteria) can be configured on the EFP:
•
Frames of a specific VLAN, a VLAN range, or a list of VLANs (100-150 or 100,103,110)
•
Frames with no tags (untagged)
•
Frames with identical double-tags (VLAN tags) as specified
•
Frames with identical Class of Service (CoS) values
Carrier Ethernet Configuration Guide (Cisco ASR 920 Series)
2
Trunk EFP Support
Information About Trunk EFP Support
Содержание ASR 920 series
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