Traffic/Security Filters
Using Source-Port Filters
Using Named Source-Port Filters
Named source-port filters are filters that may be used on multiple ports and
port trunks. As with regular source-port filters, a port or port trunk can only
have one source-port filter, but this new capability enables you to define a
source-port filter once and apply it to multiple ports and port trunks. This can
make it easier to configure and manage source-port filters on your switch. The
commands to define, configure, apply, and display the status of named
source-port filters are described below.
Operating Rules for Named Source-Port Filters
■ A port or port trunk may only have one source-port filter, named or not
named.
■ A named source-port filter can be applied to multiple ports or port trunks.
■ Once a named source-port filter is defined, subsequent changes only
modify its action, they don’t replace it.
■ To change the named source-port filter used on a port or port trunk, the
current filter must first be removed, using the no filter source-port named-
filter <filter-name > command.
■ A named source-port filter can only be deleted when it is not applied to
any ports.
Defining and Configuring Named Source-Port Filters
The named source-port filter command operates from the global configuration
level.
Syntax: [no] filter source-port named-filter <filter-name>
Defines or deletes a named source-port filter. The filter-name
may contain a maximum of 20 alpha-numeric characters
(longer names may be specified, but they are not displayed).
A filter-name cannot be a valid port or port trunk name.
The maximum number of named source-port filters that can
be used is equal to the number of ports on a switch.
A named source-port filter can only be removed if it is not in
use (use the show filter source-port command to check the
status). Named source-port filters are not automatically
deleted when they are no longer used.
Use the no option to delete an unused named source-port filter.
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