Eiu Sparing Requirements - Nortel DMS-100 User Manual

Nortel ethernet interface unit user guide
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The EIU remained fully functional throughout the test. Although traffic from
the EIU stopped, the stoppage was due to all other components on the LAN
being non-functional and there was nothing left for the EIU to communicate
with.
These test also showed that maintenance personnel could remote login to the
EIU, start a CI process, look at OMs, and finally remote logout. The EIU could
also successfully complete an in-service test and could be manual busied, then
returned to service after successfully completing the out-of-service test.

EIU sparing requirements

The EIU is a variation on the CCS7 link interface unit 7 (LIU7) that Nortel
developed for the DMS signaling transfer point (STP). The central
maintenance software for the EIU is based on the generic software developed
for the LIU7. The local maintenance software for the EIC, the EIP, and the
routing software are particular to the EIU.
EIUs are simplex entities and therefore require a sparing strategy to handle the
following situations:
EIU sparing is established and operates as follows:
hardware failure of an EIU
batch change supplement (BCS) software upgrade on an EIU
manual maintenance actions on an EIU
The EIUs are organized in sets and lists based on routing information. All
EIUs on a single LAN are a set. Multiple sets support multiple LANs.
All SuperNode hosts (CM, FP, and application processor unit [APU]) have
one list of EIUs from a set of lists. The EIUs on this list are configured to
reach a specific subnet.
If one of the EIUs in the list fails, the DMS-100 switch selects the next
standby EIU in the list. If all EIUs in the list fail, the DMS-100 switch uses
an alternate list if one is available.
The TCP reliable transport protocol recovers from all but the most severe
forms of failure. Most EIU failures are transparent to the end applications
that is using the EIU as a router. Any applications fail if the EIU on which
they reside fails.
All EIUs are routers, hosts, or both. The sparing strategy allows only other
routers as spares. An EIU as a host and router can be used if all other
routers have failed. This sparing strategy has an impact on the host
application performance. Applications running on the EIU itself require
application level sparing to recover.
All definitions for the sparing strategy are controlled with datafill.
Chapter 4: EIU maintenance 107
DMS-100 Family EIU User Guide TELECOM12

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