Protocol Engineering; Ip Throttling; Tcp Connection Management - Nortel DMS-100 User Manual

router is determined based on the simple load balancing rules and the status of
the router.
IP Screening
Packets destined for the Supernode can be screened at the IP level. If the
source of the packet is determined to be invalid, the packet is dropped by the
EIU. For more information, refer to data schema table EXNDINV in this
document.

Protocol engineering

This section provides information on engineering rules and data for each of the
protocol layers. It also contains discussions on the maintenance of the protocol
stack and its performance.

IP throttling

IP throttle engineering is required to control congestion in the DS30 links. If
the IP throttle is not properly engineered, the robustness of the LMS on which
EIUs are located is compromised. This situation occurs because of the
potentially large number of datagrams transferred between EIUs and
SuperNode nodes across LMS.
IP (as a network layer protocol that transfers datagrams between EIUs and the
SuperNode nodes) does not have built-in flow control mechanism to provide
throttling. As a result, manual control is required. Table IPTHRON asserts
manual control over IP throttling of datagrams transmitted over DS30 links.
For information on table IPTHRON, refer to "Chapter 3: EIU datafill". For
more information on IP throttling, refer to "IP throttling" on page 65.
For information on EIU provisioning rules for LPP, SSLPP, and SNSE-LIS,
refer to Provisioning Rules for LPP, SSLPP, and SNSE LIS, System
Engineering Bulletin number 92-02-001, version 01.09.

TCP connection management

The TCP layer provides reliable delivery of the data to its remote peer through
well-defined connections. The connection management for SuperNode TCP is
handled through datafill in table IPHOST. Table IPHOST permits the
operating company to vary the number of TCP connections on a per node
basis.When changing this value, note the following points:
•
•
decreasing the allowed number of connections causes all connections to be
dropped
existing connections are maintained when you increase the number of
connections
Chapter 2: EIU messaging protocols 61
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