Configuring IP RIP Filters
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Configuring IP RIP Filters

The ipfilter command is used to add or delete an IP RIP Output or Input filter. The IP RIP
Filtering feature gives you a means of controlling the operation of the IP RIP protocol. By
using IP RIP filters, you can minimize the number of entries that are put into the IP Forward-
ing Table as well as improve overall network performance by eliminating unnecessary traffic.
Two types of IP RIP filters are available:
•RIP Input filters control which IP networks are allowed into the switch’s IP Forwarding
Table whenever IP RIP updates are received.
•RIP Output filters control the list of IP networks that are included in the RIP Updates sent
out by the switch on any interface. Thus, RIP Output filters effectively control which
networks the router advertises in the RIP updates it generates.
Here are some example uses of IP RIP filters:
• RIP Input and Output filters can be used to isolate entire network segments (and/or rout-
ers) in order to make the network “appear” differently to the network’s various segments.
• RIP Input and Output filters can be used to reduce the overall amount of WAN traffic that
is needed to advertise routes that should not be used by a particular network segment.
♦ Important Note ♦
The IP RIP Filtering feature works only with the
switch’s standard RIP routing protocol. If you elect to
use Alcatel’s Advanced Routing feature (GateD) to
provide RIP routing functionality in your switch, you
will not be able to activate IP RIP Filtering.

Adding a “Global” IP RIP Filter

Follow the steps below to add a “global” IP RIP Output or Input filter.
1. Enter ipfilter.
A screen similar to the following displays:
Selecting global IP filter:
Add or delete entry {add(a), delete(d)} (a) :
Enter a (or just press Enter) to select to add a filter.
2. The following prompt displays:
Filter type{RIP Output(ro),
RIP Input(ri)} (ro) :
Enter ro (or just press Enter) to add a RIP Output filter. Enter ri to add a RIP Input filter.
3. The following prompt displays:
Filter action {block(b), allow(a)} (a) :
Enter a (or just press Enter) to set the filter action to “allow.”
Enter b to set the filter action to “block.”