Chapter 64 Configuring Y.1731 (Ai And Rdi) - Cisco Catalyst 4500 Series Configuration Manual

About Y.1731
Term
OAM
Service VLAN
About Y.1731
These sections contain conceptual information about Y.1731:
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The advent of Ethernet as a metropolitan and WAN technology imposes a new set of Operations,
Administration, and Maintenance (OAM) requirements on Ethernet's traditionally Enterprise-oriented
functions. The expansion of this technology into the larger and more complex wider user base makes
operational management of link uptime crucial. Isolating and responding to failures quickly directly
affects the competitiveness of the service provider.
Server MEP
A Server MEP is a combined function of the server layer termination function and the server and ETH
adaptation function. It issues frames with ETH-AIS information upon detecting a defect at the Server
layer by the server layer termination function or the adaptation function.
A Virtual MEP represents the logical termination point of Connectivity Fault Management (CFM) MAs
defined at the link or transport layer. A server MEP runs or is defined at Maintenance Level -1. For
example, you could associate an outward-facing Server MEP with each termination point of IEEE
802.3ah OAM, or with each termination point of MPLS PW OAM.
Alarm Indication Signal
ETH-AIS allows you to suppress alarms when defects are detected at the server (sub) layer. Because of
STP's ability to restore, you would not expect to apply ETH-AIS in the STP environments. For the
Catalyst 4500 Metro switch, an administrator can enable and disable AIS in the STP environment.
You can enable or disable transmission of frames with ETH-AIS information on an MEP (or on a Server
MEP).
You also can issue frames with ETH-AIS information at the client Maintenance Level by a MEP,
including a Server MEP upon detecting defect conditions.
The defect conditions may include:
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Software Configuration Guide—Release IOS XE 3.3.0SG and IOS 15.1(1)SG
64-2
Server MEP, page 64-2
Alarm Indication Signal, page 64-2
Ethernet Remote Defect Indication, page 64-3
Signal fail conditions with ETH-CC enabled
AIS condition with ETH-CC disabled
Chapter 64 Configuring Y.1731 (AIS and RDI)
Definition
Operations Administration and Maintenance
The VLAN tag that uniquely identifies a
Customer Service Instance within the Provider
network
OL-25340-01