How Does Dot1Ag Work Across A Carrier Network - Dell Networking N4000 Series Configuration Manual

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IEEE Std. 802.3 LAN, Dot1ag addresses fault diagnosis at the service layer

across networks comprising multiple LANs, including LANs other than 802.3

How Does Dot1ag Work Across a Carrier Network?

A typical metropolitan area network comprises operator, service provider, and

customer networks. To suit this business model, CFM relies on a functional

model of hierarchical maintenance domains (MDs). These domains are

assigned a unique MD level. There is a maximum of 8 levels, which can be

nested but cannot overlap. Each organization can have its own maintenance

domain. The MD level limits administrator access to the appropriate domain.

Figure 26-1 depicts three domains: the customer subscribes to the services of

a provider, who, in turn, subscribes to the services of two operators. This

scenario is a likely one, since no operator has complete coverage of a large

region. A service instance would span the provider network covering one or

more operators. Every domain has its own network management system.

Dot1ag defines OAM services that operate across these domains (the vertical

arrow) and within them (the horizontal arrow)

Figure 26-1. Organization of Domains

Entities at different levels have different responsibilities. For example, the

lower level (operator) overlooks a subset of the network in detail and provides

information about its status to its higher levels such as the provider level).

Configuring Connectivity Fault Management

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