108Chapter 4: EIU maintenance

A simple form of load balancing is used such that multiple end-hosts in the DMS switch are assigned an active EIU in a round-robin fashion. This requirement does not take into account the relative amounts of traffic to or from the end hosts.

For more information on EIU redundancy and sparing, refer to “EIU sparing and redundancy” on page 39.

Figure 25 shows the EIU redundant configuration.

Figure 25 EIU redundant configuration

Subnet 1 Subnet 2

CM

EIU 9

FP

AP

ELIU

EIU 1

EIU 2

EIU 3

 

 

 

 

EIU 1 advertises CM,

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

FP and ELIU IP

 

 

 

 

 

 

 

 

 

 

address

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

External

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

router

 

 

 

 

 

EIU 2 advertises

 

 

 

Listening

 

 

 

 

EIU 9 and AP IP

 

 

 

 

 

 

 

 

 

 

to RIP

 

 

 

 

address every

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

30 seconds

UNIX

 

 

box

 

 

 

 

EIU 3 advertises CM, EIU 9, FP, AP and ELIU

IP address every 30 sec-

External router

 

 

UNIX

 

 

Listening

 

 

 

 

 

 

box

 

 

to RIP

 

 

 

 

 

 

Can be another subnet or new network on this side of external router

Can be another subnet or new network on this side of external router

Subnet 2

Automated system maintenance

The EIU hardware is automatically maintained using a variety of techniques common to all DMS products. These techniques fall into the following categories:

checks on hardware integrity during normal operations (that is, parity or error detection and correction on memory arrays, cyclic redundancy checks [CRC] on data in transit, and erroneous state detection). These

297-8991-910 Standard 03.01 August 1999

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Cabletron Systems DMS-100 manual Automated system maintenance, EIU Eliu