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Catalyst 4500 Series, Catalyst 2948G, Catalyst 2948G-GE-TX, and Catalyst 2980G Switches Software Configuration Guide—Release 8.2GLX
78-15908-01
Chapter 19 Configuring Protocol Filtering
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:
•
IP (ip)
•
IPX (ipx)
•
AppleTalk and DECnet (group)
•
Packets not belonging to any of these protocols
Default Protocol Filtering Configuration
Table 19-1
shows the default protocol filtering configuration.
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:
Table 19-1 Protocol Filtering Default Configuration
Feature
Default Value
Protocol filtering
Disabled
ip mode
on
ipx mode
auto
group mode
auto
Task
Command
Step 1
Enable protocol filtering.
set protocolfilter enable
Step 2
Set the protocol membership of the desired ports. set port protocol mod_num/port_num {ip | ipx |
group} {on | off | auto}
Step 3
Verify the port filtering configuration.
show port protocol [mod_num[/port_num]]