Defining IP Address Ranges for the Local Route Cache
The local route cache lets you use Alteon resources more efficiently. The local network address and local network mask parameters (accessed via the /cfg/l3/frwd/local/add command) define a range of addresses that are cached on Alteon. 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 mask are both set to 0.0.0.0. This produces a range that includes all Internet addresses for route caching: 0.0.0.0 through 255.255.255.255.
Note: All addresses that fall outside the defined range are forwarded to the default gateway. The default gateways must be within range.
Addresses to be cached are subnets that are directly connected, and for which there is an interface configured. To limit the route cache to your local hosts, you could configure the parameters as shown in the examples in Local Routing Cache Address Example Ranges:
 
Local Routing Cache Address Example Ranges 
Local Host Address Range
Address
Mask
0.0.0.0 – 127.255.255.255
0.0.0.0
128.0.0.0
128.0.0.0 – 255.255.255.255
128.0.0.0
128.0.0.0
205.32.0.0 – 205.32.255.255
205.32.0.0
255.255.0.0