Users Guide

Table Of Contents
Group Address Interface Mode Uptime Expires Last Reporter
225.1.1.1 vlan121 IGMPv2-Compat 12:39:00 00:01:58 121.1.1.10
225.1.1.2 vlan121 IGMPv2-Compat 12:39:00 00:01:58 121.1.1.10
225.1.1.3 vlan121 IGMPv2-Compat 12:39:00 00:01:58 121.1.1.10
225.1.1.4 vlan121 IGMPv2-Compat 12:39:00 00:01:58 121.1.1.10
225.1.1.5 vlan121 IGMPv2-Compat 12:39:00 00:01:58 121.1.1.10
225.1.1.6 vlan121 IGMPv2-Compat 12:39:00 00:01:58 121.1.1.10
225.1.1.7 vlan121 IGMPv2-Compat 12:39:00 00:01:58 121.1.1.10
225.1.1.8 vlan121 IGMPv2-Compat 12:39:00 00:01:58 121.1.1.10
225.1.1.9 vlan121 IGMPv2-Compat 12:39:00 00:01:58 121.1.1.10
225.1.1.10 vlan121 IGMPv2-Compat 12:39:00 00:01:58 121.1.1.10
225.1.1.11 vlan121 IGMPv2-Compat 12:39:00 00:01:58 121.1.1.10
225.1.1.12 vlan121 IGMPv2-Compat 12:39:00 00:01:58 121.1.1.10
225.1.1.13 vlan121 IGMPv2-Compat 12:39:00 00:01:58 121.1.1.10
225.1.1.14 vlan121 IGMPv2-Compat 12:39:00 00:01:58 121.1.1.10
225.1.1.15 vlan121 IGMPv2-Compat 12:39:00 00:01:58 121.1.1.10
225.1.1.16 vlan121 IGMPv2-Compat 12:39:00 00:01:58 121.1.1.10
IGMP snooping
IGMP snooping uses the information in IGMP packets to generate a forwarding table that associates ports with multicast groups. When
switches receive multicast frames, they forward them to their intended receivers. OS10 supports IGMP snooping on virtual local area
network (VLAN) interfaces.
Effective with OS10 release 10.4.3.0, IGMP snooping is enabled by default.
Configure IGMP snooping
Enable IGMP snooping globally using the ip igmp snooping enable command in CONFIGURATION mode. This command
enables IGMP snooping on all VLAN interfaces.
NOTE:
With IGMP snooping configured, OS10 does not support scale profile VLAN configuration. To use scale profile
configuration with IGMP snooping, use the mode l3 command.
(Optional) Disable IGMP snooping on specific VLAN interfaces using the no ip igmp snooping command in VLAN INTERFACE
mode.
(Optional) Multicast flood control is enabled by default. To disable the multicast flood restrict feature, use the no multicast
snooping flood-restrict command in CONFIGURATION mode. To reenable the feature globally, use the multicast
snooping flood-restrict command in CONFIGURATION mode.
In a network, the snooping switch is connected to a multicast Router that sends IGMP queries. On a Layer 2 network that does not
have a multicast router, you can configure the snooping switch to act as querier. Use the ip igmp snooping querier command
in VLAN INTERFACE mode to send the queries.
OS10 learns the multicast router interface dynamically based on the interface on which IGMP membership query is received. To assign
a multicast router interface statically, use the ip igmp snooping mrouter interface interface—type command in
VLAN INTERFACE mode.
NOTE:
IGMP snooping dynamically detects the mrouter interface based on IGMP queries that it receives. If there are more
than one multicast routers connected to the snooping switch, one of them will send IGMP queries and the interface
connected to that router is dynamically learnt as an mrouter port. You must configure the interfaces connected to
other multicast routers as static mrouter port.
(Optional) Configure the IGMP version using the ip igmp version version-number command in VLAN INTERFACE mode.
(Optional) The fast leave option allows the IGMP snooping switch to remove an interface from the multicast group immediately on
receiving the leave message. Enable fast leave with the ip igmp snooping fast-leave command in VLAN INTERFACE mode.
(Optional) Configure the time interval for sending IGMP general queries with the ip igmp snooping query-interval
query-interval-time command in VLAN INTERFACE mode.
(Optional) Configure the maximum time for responding to a query advertised in IGMP queries using the ip igmp snooping
query-max-resp-time query-response-time command in VLAN INTERFACE mode.
(Optional) Configures the time interval between group-specific IGMP query messages with the ip igmp snooping last-
member-query-interval query-interval-time command in VLAN INTERFACE mode.
IGMP snooping configuration
OS10(config)# ip igmp snooping enable
OS10(config)# interface vlan 100
OS10(conf-if-vl-100)# ip igmp snooping mrouter interface ethernet 1/1/32
Multicast
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