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DES-3200 Series Layer 2 Managed Fast Ethernet Switch CLI Reference Guide
265
Chapter 30
IGMP / MLD Snooping
Command List
The Internet Group Management Protocol (IGMP) is a L3 protocol used to manage the
membership of Internet Protocol multicast groups. IGMP is used by IP hosts and adjacent
multicast routers to establish multicast group memberships. IGMP snooping is the process of
listening to IGMP network traffic. IGMP snooping, as implied by the name, is a feature that allows
a layer 2 switch to "listen in" on the IGMP conversation between hosts and routers by processing
the layer 3 IGMP packets sent in a multicast network.
When IGMP snooping is enabled in a switch it analyzes all IGMP packets between hosts
connected to the Switch and multicast routers in the network. When a switch hears an IGMP report
from a host for a given multicast group, the Switch adds the host's port number to the multicast list
for that group. And, when the Switch hears an IGMP Leave, it removes the host's port from the
table entry.
The Multicast Listener Discovery (MLD) is used by IPv6 routers to discover multicast listeners on a
directly attached link, much as IGMP is used in IPv4. The protocol is embedded in ICMPv6 instead
of using a separate protocol. MLDv1 is similar to IGMPv2 and MLDv2 similar to IGMPv3.
The Switch only supports IGMP and MLD snooping awareness. This means that the multicast
traffic forwarding is only based on L2 MAC addresses associated to groups that the Switch has
joined. The source IP address of the multicast traffic will be ignored.
config igmp_snooping [vlan_name <vlan_name 32> | vlanid <vlanid_list> | all ] {state [enable |
disable] | fast_leave [enable|disable] | report_suppression [enable | disable]
config igmp_snooping rate_limit [ports <portlist> | vlanid <vlanid_list>] [<value 1-1000> |
no_limit]
config igmp_snooping querier [vlan_name <vlan_name 32> | vlanid <vlanid_list> | all]
{query_interval <sec 1-65535> | max_response_time <sec 1-25> | robustness_variable
<value 1-7> | last_member_query_interval <sec 1-25> | state [enable | disable] | version
<value 1-3>}(1)
config igmp access_authentication ports [all | <portlist>] state [enable | disable]
config router_ports [<vlan_name 32> | vlanid <vlanid_list> ] [add | delete] <portlist>
config router_ports_forbidden [ <vlan_name 32> | vlanid <vlanid_list> ] [add | delete] <portlist>
enable igmp_snooping
disable igmp_snooping
create igmp_snooping static_group [vlan<vlan_name 32> | vlanid <vlanid_list>] <ipaddr>
delete igmp_snooping static_group [vlan<vlan_name 32> | vlanid <vlanid_list>] <ipaddr>
config igmp_snooping static_group [vlan <vlan_name 32> | vlanid <vlanid_list>] <ipaddr> [add |
delete] <portlist>
show igmp_snooping static_group {[vlan <vlan_name 32> | vlanid <vlanid_list>] <ipaddr>}
config igmp_snooping data_driven_learning [all | vlan_name <vlan_name> | vlanid
<vlanid_list>] {state [enable | disable] | aged_out [enable | disable] | expiry_time <sec 1-
65535>}
config igmp_snooping data_driven_learning max_learned_entry <value 1-1024>
clear igmp_snooping data_driven_group [all | [vlan_name <vlan_name> | vlanid <vlanid_list>]
[<ipaddr> | all]]