Defining Ip Address Ranges For The Local Route Cache; Table 1-4 Local Routing Cache Address Ranges - Nortel Web OS Switch Software Application Manual

Defining IP Address Ranges for the Local
Route Cache
A local route cache lets you use switch resources more efficiently. The local network address
and local network mask parameters (accessed via the /cfg/ip/frwd/local/add com-
mand) define a range of addresses that will be cached on the switch. The local network address
is used to define the base IP address in the range that will be cached. The local network mask is
applied to produce the range. To determine if a route should be added to the memory cache, the
destination address is masked (bit-wise AND) with the local network mask and checked
against the local network address.
By default, the local network address and local network mask are both set to 0.0.0.0. This pro-
duces a range that includes all Internet addresses for route caching: 0.0.0.0 through
255.255.255.255.
To limit the route cache to your local hosts, you could configure the parameters as shown in the
following example:

Table 1-4 Local Routing Cache Address Ranges

Local Host Address Range
0.0.0.0 - 127.255.255.255
128.0.0.0 - 128.255.255.255
205.32.0.0 - 205.32.255.255
N
OTE
fall outside the defined range are forwarded to the default gateway.
212777-A, February 2002
– Static routes must be configured within the configured range. All other addresses that
Local Network Address Local Network Mask
0.0.0.0
128.0.0.0
205.32.0.0
Chapter 1: Basic IP Routing
Web OS 10.0 Application Guide
128.0.0.0
128.0.0.0 or 255.0.0.0
255.255.0.0
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