Default Protocol Filtering Configuration; Configuring Protocol Filtering On The Switch; Configuring Protocol Filtering - Cisco WS-C2948G-GE-TX Configuration Manual

Default Protocol Filtering Configuration

For example, if a host that supports both IP and Internetwork Packet Exchange (IPX) is connected to a
switch port that is configured as auto for IPX, and the host is transmitting only IP traffic, the port to
which the host is connected will not forward any IPX flood traffic to the host. However, if the host
transmits an IPX packet, the supervisor engine software detects the protocol traffic and the port is added
to the IPX group, allowing the port to receive IPX flood traffic. If the host does not send any IPX traffic
for more than 60 minutes, the port is removed from the IPX protocol group.
By default, ports are configured as on for the IP protocol group. Typically, you should configure a port
to auto for IP only if there is a directly connected end station that is connected to the port. The default
port configuration for IPX and Group is auto.
Packets are classified into these protocol groups:
•
•
•
•
Default Protocol Filtering Configuration
Table 19-1
Table 19-1 Protocol Filtering Default Configuration
Feature
Protocol filtering
ip mode
ipx mode
group mode

Configuring Protocol Filtering on the Switch

The next two sections describe how to configure and disable protocol filtering on Ethernet, Fast Ethernet,
and Gigabit Ethernet ports.

Configuring Protocol Filtering

To configure protocol filtering on Ethernet, Fast Ethernet, and Gigabit Ethernet ports, perform this task
in privileged mode:
Task
Step 1
Enable protocol filtering.
Step 2
Set the protocol membership of the desired ports. set port protocol mod_num/port_num {ip | ipx |
Step 3 Verify the port filtering configuration.
Catalyst 4500 Series, Catalyst 2948G, Catalyst 2948G-GE-TX, and Catalyst 2980G Switches Software Configuration Guide—Release 8.2GLX
19-2
IP (ip)
IPX (ipx)
AppleTalk and DECnet (group)
Packets not belonging to any of these protocols
shows the default protocol filtering configuration.
Chapter 19
Default Value
Disabled
on
auto
auto
Command
set protocolfilter enable
group} {on | off | auto}
show port protocol [mod_num[/port_num]]
Configuring Protocol Filtering
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