42Chapter 1: Introduction to the EIU

the EIU state

During normal operation, the default EIU routes all messages to the CM. If there is a problem with the default EIU or its links, the following occurs:

the default EIU advertises to the network that it is no longer available (or in the event of a LAN-side link failure, the neighboring routers cannot reach the default EIU)

another provisioned EIU advertises that it is the router (net hop) to the SuperNode-side subnet and the CM

During normal operations, if there is a problem with the non-default EIU or its links, there is no impact on service unless the default EIU experiences problems, in which case the SuperNode subnet is isolated from the LAN-side subnet until one of more EIUs are brought back into service.

Applications running on the EIUs must have sparing defined at the application level.

Billing

EIUs do not directly affect billing functions.

Service orders

The EIU does not affect service order functions.

User interface characteristics

The EIU uses the existing peripheral user interface (UI) based on the DMS MAPCI. The MAPCI includes additions to the PM level of the MAP display to include the new hardware components. Figure 10 shows the hierarchical relationship for the MAP levels used for the components.

Figure 10 MAP display level hierarchy

 

PM level

 

Existing

EIU level

EXND level

peripheral

 

(LAN devices)

modules

 

 

297-8991-910 Standard 03.01 August 1999

 

 

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Cabletron Systems DMS-100 manual Billing, Service orders, User interface characteristics