Avaya Configuring IP Services Bedienungsanleitung Seite 87

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Configuring IP Routers and Interfaces
2-59
Parameter: Zero Subnet Enable
Default: Disable
Options: Enable | Disable
Function: Specifies whether an interface address whose subnet portion is all zeros
should be declared legal or not. If you set this parameter to Enable, then
you can configure IP interfaces with a subnet ID of zero. Setting this
parameter to Disable prevents you from doing so.
Instructions: Accept the default, Disable, if you do not have any interfaces that have a
zero subnet ID. Otherwise, reset this parameter to Enable.
The use of all-zero subnet addresses is discouraged for the following
reason: 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.
MIB Object ID: 1.3.6.1.4.1.18.3.5.3.2.1.1.10
Parameter: Estimated Networks
Default: 0
Range: 0 to 2147483647
Function: Allows the IP software to preallocate system resources based on the
anticipated size of 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.
Instructions: Set to the number of networks (including unique subnets) that you expect.
Avoid using a number that is excessively large. This will cause a wasteful
overallocation of memory.
If you use the default value, 0, IP software preallocates memory for 500
routing table entries.
MIB Object ID: 1.3.6.1.4.1.18.3.5.3.2.1.1.11
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