HP procurve 8100fl series Management And Configuration Manual page 154

Multimedia Traffic Control with IP Multicast (IGMP)
CLI: Configuring and Displaying IGMP
N o t e s
10-4
Blocked: Drop all IGMP Control traffic (reports, joins, leaves) received
■
from devices on the specified ports, and prevent any outgoing multicast
traffic from moving through these ports. Multicast traffic (non-control)
will be received and forwarded to the VLAN ports according to the
currently established IGMP forwarding rules.
■ Forward: Causes the switch to forward all IGMP and IP multicast trans­
missions through the port.
Whenever IGMP is enabled, the switch generates an Event Log message
indicating whether querier functionality is enabled. For more information on
querier functionality and Fast-Leave operation, refer to "How IGMP Operates"
on page 10-8.
IP multicast traffic groups are identified by IP addresses in the range of
224.0.0.0 to 239.255.255.255. Also, incoming IGMP packets intended for
reserved, or "well-known" multicast addresses automatically flood through all
ports (except the port on which the packets entered the switch). For more on
this topic, see "Excluding Well-Known or Reserved Multicast Addresses from
IP Multicast Filtering" on page 10-16.
Configuring Per-Port IGMP Traffic Filters. The following interface-
based command is used to specify how each port should handle IGMP traffic.
Syntax: [no] ip igmp snooping <auto | blocked | forward> vlan <vlan-id>]
Used in the VLAN context, this command specifies how each port
should handle IGMP traffic. (Default:
Note: Where a static multicast filter is configured on a port, and an
IGMP filter created by this command applies to the same port, the
IGMP filter overrides the static multicast filter for any inbound
multicast traffic carrying the same multicast address as is
configured in the static filter.
For example, suppose you wanted to configure IGMP as follows for VLAN 2
on the 100/1000T ports on a module in slot 5:
Ports 5/1-5/2 auto
Ports 5/3-5/4 forward
Ports 5/5-5/6 blocked
Filter multicast traffic. Forward IGMP traffic to hosts on these
ports that belong to the multicast group for which the traffic is
intended. (Also forward any multicast traffic through any of
these ports that is connected to a multicast router.) Note that
'auto' is the default setting on all ports.
Forward all multicast traffic through this port.
Drop all IGMP Control traffic (reports, joins, leaves) received
from devices on these ports, and prevent any outgoing
multicast traffic from moving through these ports. .
auto
.)