Users Guide

NOTE: OS10 supports IGMP snooping only with proxy reporting. OS10 does not relay the IGMP join packets received from
hosts as is. Instead, OS10 generates, bundles, and sends IGMP join packets to mrouter port based on the version of IGMP
queries received from IGMP routers. Proxy reporting reduces the number of IGMP control packets sent to the multicast
router.
Configuration notes
All Dell EMC PowerSwitches except MX-Series, S4200-Series, S5200 Series, and Z9332F-ON:
If you configure and unconfigure a static connection to a multicast router on an interface using the ip igmp snooping mrouter
interface command in VLAN mode, the router port still appears in the show ip igmp snooping mrouter vlan output. To remove
the VLAN port from the show output, configure the VLAN port again using the ip igmp snooping mrouter interface
command, and then unconfigure it using the no version of the command.
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: You cannot enable IGMP or MLD snooping when configuring VLAN scale profile. If you enable VLAN scale profile,
OS10 disables IGMP and MLD snooping globally. When you disable VLAN scale profile configuration, you must explicitly
enable IGMP and MLD snooping globally.
● (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
OS10(conf-if-vl-100)# ip igmp snooping querier
OS10(conf-if-vl-100)# ip igmp version 3
OS10(conf-if-vl-100)# ip igmp snooping fast-leave
OS10(conf-if-vl-100)# ip igmp snooping query-interval 60
OS10(conf-if-vl-100)# ip igmp snooping query-max-resp-time 10
OS10(conf-if-vl-100)# ip igmp snooping last-member-query-interval 1000
Multicast
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