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156 ITG engineering guidelines
Example 1
Invalid configuration
The following configuration is not valid, as the TLAN and ELAN subnets
overlap.
ELAN IP
10.0.0.136
ELAN GW
10.0.0.129
ELAN Subnet Mask
255.255.255.224
TLAN Node IP
10.0.0.56
TLAN Card IP
10.0.0.57
TLAN GW
10.0.0.1
TLAN Subnet Mask
255.255.255.0.
The ELAN subnet range of addresses – 10.0.0.129 to 10.0.0.160 – overlaps
the TLAN subnet range of addresses – 10.0.0.1 to 10.0.0.255. This
contravenes the IP addressing practices, as it is equally valid to route the
IP packets over either interface. The resulting behavior from such a setup
is undetermined.
The overlapping IP address scheme must be corrected when adding a
Media Card 32-port trunk card to an existing ITG Trunk 2.x node that
consists of ITG 24-port trunk cards and ITG 8-port trunk cards.
Example 2
Valid configuration
The following configuration is valid, as the ELAN and TLAN subnets do
not overlap.
The IP addresses can be split as follows.
ELAN IP
10.0.0.136
ELAN GW
10.0.0.129
ELAN Subnet Mask
255.255.255.224
TLAN Node IP
10.0.0.56
TLAN Card IP
10.0.0.57
TLAN GW
10.0.0.1
TLAN Subnet Mask
255.255.255.128.
Nortel Communication Server 1000
IP Trunk Fundamentals
NN43001-563 01.01 Standard
Release 5.0 30 May 2007
Copyright © 2007, Nortel Networks
.