Nortel Networks NN43001-563 Selecting public or private IP addresses

IP Trunk3.01 (and later) LAN installation and configuration 155
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.
The TLAN subnet has a range of addresses from 10.0.0.1 to 10.0.0.127.
The ELAN subnet is in a separate subnet, with a range of addresses from
10.0.0.129 to 10.0.0.160. This configuration results in smaller TLAN subnet
addresses, but it fulfills the requirement that subnets do not overlap.
Selecting public or private IP addresses
Consider a number of factors to determine if the TLAN and ELAN subnets
will use private (internal IP addresses) or public IP addresses.
Nortel Communication Server 1000
IP TrunkFundamentals
NN43001-563 02.01 Standard
Release 5.5 21 December 2007
Copyright© 2007, Nor tel Networks
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