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108 Chapter 4: EIU maintenance
297-8991-910 Standard 03.01 August 1999
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
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
EIU 1 advertises CM,
FP and ELIU IP
address
Can be another
subnet or new
network on this
side of external
router
Base_Tel-5
AP
EIU 9
CM
FP
ELIU
EIU 1
EIU 2
EIU 3
External
router
Subnet 1 Subnet 2
Listening
to RIP
EIU 2 advertises
EIU 9 and AP IP
address every
30 seconds
UNIX
box
Can be another
subnet or new
network on this
side of external
router
External
router
Listening
to RIP
UNIX
box
EIU 3 advertises CM,
EIU 9, FP, AP and ELIU
IP address every 30 sec-
Subnet 2