Avaya Configuring IP Services Bedienungsanleitung Seite 73

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Customizing IP Services
114065 Rev. A 3-9
Allowing an All-Zero or All-One Subnet Address
By default, IP considers an interface with an address whose subnet portion
consists of all zeros or all ones to be an illegal address.
Using Site Manager, you can configure IP to allow an all-zero and all-one subnet
address.
Enable this feature with caution: it can result in an ambiguous address. For
example, if an all-zero subnet address and an all-zero broadcast address are both
valid, the router cannot distinguish an all-subnets broadcast from a directed
broadcast for the zero subnet.
Estimating the Size of the Routing Table
IP allows you to estimate the number of networks and hosts that will require an
entry in the IP routing table. The router uses your estimate to preallocate memory
for the routing table. Preallocation of memory increases the speed with which IP
software can learn routes because it removes the overhead caused by dynamic
memory allocation. Preallocation also makes better use of memory and reduces
the amount of memory required. By default, the router allocates resources to
support 500 network and host entries in the routing table.
If you have enabled ISP mode, the default value is 40,000 entries. You must
reduce this value to an appropriate size if the sysem is running with 8 MB or 16
MB processor modules. Failure to change the value will result in an
out-of-memory error on these processors.
You can use Site Manager to estimate the number of networks and hosts
(overriding the default).
Avoid making an estimate that is excessively large. This will cause a wasteful
overallocation of memory.
Site Manager: Zero Subnet Enable parameter: page A-42
Site Manager: Estimated Networks parameter: page A-43
Site Manager: Estimated Hosts parameter: page A-43
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