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IP Multicast Filtering
Issue 1 July 2006 139
Port Classification
Overview
With the C360, you can classify any port as regular or valuable. Setting a port to valuable
means that, in case of Ethernet link failure of that port, a link fault trap can be sent even when
the port is disabled. This feature is particularly useful for the link/intermodule redundancy
application, where you need to be informed about a link failure on the dormant port and resume
traffic quickly.
Port Classification CLI Commands
IP Multicast Filtering
Overview
IP Multicast is a method of sending a single copy of an IP packet to multiple destinations. It can
be used by different applications including video streaming and video conferencing.
The Multicast packet is forwarded from the sender to the recipients, duplicated only when
needed by routers along the way and sent in multiple directions such that it reaches all the
members of the Multicast group. Multicast addresses are a special kind of IP addresses (class
D), each identifying a multicast group. Stations join and leave multicast groups using IGMP. This
is a control-plane protocol through which IP hosts register with their router to receive packets for
certain multicast addresses.
IP multicast packets are transmitted on LANs in MAC multicast frames. Traditional LAN
switches flood these multicast packets like broadcast packets to all stations in the VLAN. In
order to avoid sending multicast packets where they are not required, multicast filtering
functions may be added to the layer 2 switches, as described in IEEE standard 802.1D. Layer 2
switches capable of multicast filtering send the multicast packets only to ports connecting
members of that multicast group. This is typically based on IGMP snooping.
In order to... Use the following command...
Set the port classification to
either regular or valuable
set port classification
Display a port's classification show port classification