Cisco ASR-920-4SZ-D User Manual

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EFD is supported on down MEPs. A down MEP sends and receives CFM frames through the wire
connected to the port on which the MEP is configured. See Configuring Ethernet Connectivity Fault
Management in a Service Provider Network.
Restrictions for REP Access Gateway
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REP AG is supported for only for Port MEPs.
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When a link down is observed between the REP and Non-REP device, the convergence time is greater
with a Copper connection.
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EFD is supported on Port MEPs and EFP MEPs.
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CCM interval for MAs on which EFD is supported is limited.
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EFD is not supported on Trunk EFPs.
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EFD notifications are only supported for a single client per MA. EFD notifications are not supported
for both G-8032 and REP simultaneously.
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Only a single MEP can be configured on a the interface or EFP for EFD.
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REP AG is not supported on the ASR 900 RSP3 Module.
Information About REP Access Gateway
In a network when a link failure occurs, a Non-REP device network (access gateway) directly connected to
REP network sends failure notification, so that REP network can reroute the traffic to alternate route. But,
access devices supporting REP Edge No-Neighbor (REP ENN) only support one interface configured as a
REP Edge No-Neighbor port resulting in an unsupported architecture with the REP Access Gateway (REP
AG) device.
Fast failure detection can be established by enabling communication between Connectivity Fault Manager
(CFM) and REP. CFM on the edge ports can notify REP if any failures are detected on the monitored links,
allowing the appropriate re-convergence actions to be taken.
The mechanism for the communication is for REP to register as an Ethernet Fault Detection (EFD) client, so
that any CFM defects above a configurable threshold triggers a notification to REP.
To trigger EFD notifications on the router, CFM must be configured.Note
REP Access Gateway Enhancements
In a network where a REP and non-REP devices are connected and when a link failure occurs, a Non-REP
device network (access gateway) directly connected to REP network sends failure notification, so that REP
network can reroute the traffic to an alternate route. But, access devices supporting REP Edge No-Neighbor
LAN Switching Configuration Guide Cisco IOS XE Everest 16.5.1 (Cisco ASR 900 Series)
2
REP Access Gateway
Restrictions for REP Access Gateway

Cisco ASR-920-4SZ-D Specifications

General

Brand	Cisco
Model	ASR-920-4SZ-D
Category	Network Router
Language	English