Chapter 4: Ethernet Connectivity Fault Management; Maintenance Domain - Avaya 2330 Manual

Chapter 4: Ethernet Connectivity Fault
Avaya Secure Router 2330/4134 supports the 802.1ag protocol, which provides operation, administration,
maintenance (OAM) functionality for Ethernet. Specifically, IEEE 802.1ag Connectivity Fault Management
(CFM) provides OAM tools for the service layer, which allows you to monitor and troubleshoot an end-to-
end Ethernet service instance. Ethernet CFM enables the service provider to know if an Ethernet Virtual
Circuit (EVC) fails, and if so, provides the tools to rapidly isolate the failure.
The end-to-end service can be provider edge (PE) to PE device or customer edge (CE) to CE device. The
customer VLAN tag defines a service instance. Based on the customer VLAN, the customer receives
service as defined in their customer agreement. When you initiate CFM frames from the Secure Router
2330/4134, the frames are tagged with the C-VLAN only. CFM is not supported on an interface that uses
stacked VLANs.
Ethernet CFM is the standard for Layer 2 ping, Layer 2 traceroute, and the end-to-end connectivity check
of the Ethernet network.
Avaya supports Ethernet CFM on chassis Gigabit Ethernet (GbE) ports only.
The 802.1ag feature divides or separates a network into administrative domains called Maintenance
Domains (MD). Each MD includes the following attributes:
• Maintenance Associations (MA)
• Maintenance End Points (MEP)
• Maintenance Intermediate Points (MIP)

Maintenance Domain

A Maintenance Domain (MD) is the part of a network that is controlled by a single administrator.
For example, a customer can engage the services of a service provider, who, in turn, can
engage the services of several operators. In this scenario, there can be one MD associated
with the customer, one MD associated with the service provider, and one MD associated with
each of the operators.
The Secure Router 2330/4134 supports up to 64 MDs.
You assign one of the following eight levels to the MD:
• 0–2 (operator levels)
• 3–4 (provider levels)
• 5–7 (customer levels)
Configuration — Layer 2 Ethernet
Management
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