30 Switching Configuration
You can also configure groups of protected ports, but unprotected ports are independent and cannot be
added to a group. Each group’s configuration consists of a name and a mask of ports. A port can belong
to only one set of protected ports, but an unprotected port can be added to a group as a protected port.
The group name is configurable by the network administrator.
Use the switchport protected command to designate a port as protected. Use the show
switchport protected command to display a listing of the protected ports.
CLI Example
Example #1: Configuring a Protected Port
The commands in this example name the protected port group 1 “PP_Test” and assign ports 1 and 2 to
the group.
console(config)#switchport protected 1 name PP_Test
console(config)#interface ethernet 1/g1
console(config-if-1/g1)#switchport protected 1
console(config-if-1/g1)#exit
console(config)#interface ethernet 1/g2
console(config-if-1/g2)#switchport protected 1
console(config-if-1/g2)#exit
console(config)#exit
Example #2: Viewing Protected Port Group 1
console#show switchport protected 1
Name......................................... "PP_Test"
1/g1, 1/g2
IGMP Snooping
This section describes the Internet Group Management Protocol (IGMP) Snooping feature. IGMP
Snooping enables the switch to monitor IGMP transactions between hosts and routers. It can help
conserve bandwidth by allowing the switch to forward IP multicast traffic only to connected hosts that
request multicast traffic.
Overview
The IGMP feature:
•Uses Version 3 of IGMP
• Includes snooping, which can be enabled per VLAN
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