Nortel Networks NN43001-563 - Manual (Page 44)

44 System description
Each DCHIP card controls a separate group of Follower cards. If a DCHIP
card fails, its associated Followers are removed from service as well. For
very large nodes, it is recommended that Follower cards be spread across
multiple DCHIPs, in order to provide some resiliency by allowing the IP Trunk
3.01 (and later) node to continue handling calls when one DCHIP card fails.
A DCHIP card and all of the IP trunk cards connected with it belong to one
Leader card. This means that the cards also belong to a single customer.
The group of IP trunk cards connected with one Leader is referred to as an
IP Trunk 3.01 (and later) node. If a single Meridian 1/CS 1000M system
has multiple customers requiring IP Trunk 3.01 (and later) connectivity,
a separate IP Trunk 3.01 (and later) node is required for each customer.
Multiple DCHIPs can be configured for each node.
All DCHIPs in an IP Trunk 3.01 (and later) node must be configured with the
same DCH protocol. If the user wants to use multiple DCH protocols, the
user must configure multiple IP Trunk 3.01 (and later) nodes.
Each customer requires one or more dedicated IP Trunk 3.01 (and later)
nodes. Trunks on the same IP Trunk 3.01 (and later) node share the same
dialing plan and IP network connectivity. IP Trunk 3.01 (and later) trunks
cannot be shared between customers that have independent numbering
plans and IP networks.
It is possible to configure multiple IP Trunk 3.01 (and later) nodes for one
customer. This configuration allows load balancing among multiple Leaders
for systems with more traffic than a single Leader card can support. The
configuration of multiple IP Trunk 3.01 (and later) nodes on one customer
requires splitting the dialing plan among the Leaders. Each Leader must
have a distinct range of the dialing plan. This restriction exists so that a
remote gateway can relate a DN with a single IP address.
For information about engineering an IP Trunk 3.01 (and later) node, refer to
"ITG engineering guidelines" (page 87) .
Interactions among card functions
Active Leader and Follower card interaction
The Active Leader card controls the assignment of IP addresses for all new
ITG-Pentium 24-port and Media Card 32-port trunk cards in its node. If a
new IP trunk card is added as a Follower, the new Card Configuration data,
as programmed in TM 3.1, is downloaded only to the Active Leader card.
When it boots up, the new Follower card requests its IP address from the
Active Leader card through the bootp protocol. When the Follower cards
boot up, they receive their IP address and Active Leader card IP address
from the Active Leader card.
Nortel Communication Server 1000
IP Trunk Fundamentals
NN43001-563 01.01 Standard
Release 5.0 30 May 2007
Copyright © 2007, Nortel Networks
.