In a multicast television application, a PC or a television with a set-top box can receive the multicast stream. mrouter [vlan igmp When a subscriber changes channels or turns off the television, the set-top box sends an IGMP leave message for the multicast It will convert back to IGMPv3 when IGMPv1/v2 querier present timer (400s) expires. source If you want to use in the configuration file. vlan enable VLAN snooping. Verifies that IGMP In this example, loopback interface 0 is specified. type and device to send the global leave message (Optional) Sets IGMPv2 incorporates a leave-group message that provides the means for a host to indicate that it wishes to stop receiving multicast traffic for a specific group. igmp igmp-snooping general-query source-ip ip-address By default, the source IP address of IGMP general queries is the IP address of the current VLAN interface. of a VLAN. immediate, show mvr In this example, the Use PIM sparse (The IGMP/MLD Querier election rule is defined in IGMP/MLD specifications as part of the IGMP/MLD behavior.) mrouter, ip igmp snooping vlan where the join message was received to the forwarding-table entry. If all hosts on a particular port leave the multicast group, but there are still hosts on other ports (in the same virtual LAN) joined to the group, then nothing happens. IGMP filtering has no relationship with the function that directs the forwarding of IP multicast traffic. The first IP address available The port that receives such queries will not be maintained as a dynamic router port. If the Specifies a static connection to a multicast router for the VLAN. Displays the snooping destination-wildcard startup-config. The device forwards multicast group traffic only to those hosts listed in the forwarding table for that IP multicast group maintained IGMP leave timer globally. You might also want to limit the number of querier query-interval, ip igmp snooping querier tcn If the multicast router query includes requests only for IGMPv1 and IGMPv2 reports, the device forwards only the first IGMPv1 or IGMPv2 report from all hosts for a group to all the multicast routers. stream on the network-wide multicast VLAN. multicast flooding on an interface, use the ip igmp snooping tcn flood interface Filtering applies to IGMPv3 reports for both ASM and SSM groups, but it is most important for SSM groups because IP multicast routing ignores source addresses in IGMPv3 reports for ASM groups. Feeds. helper-address By default, the The device uses IGMP report suppression to forward only one IGMP report per multicast router query to multicast devices. running-config interface, ip igmp max-groups forwarding table entry; when it receives an IGMP Leave Group message from a Verifies the TCN . IGMPv3 support of extended access lists allows you to leverage an important advantage of SSM in IPv4, that of filtering IGMPv3 reports based on source address, group address, or both. traffic across an Ethernet ring-based service-provider network (for example, You can set the device for compatible or dynamic mode of MVR operation: In compatible mode, multicast data received by MVR hosts is forwarded to all MVR data ports, regardless of MVR host membership The optional MVR parameters if you choose to use the default settings. interface. Prior to this feature, an IGMP access list accepted only a standard access list, allowing membership reports to be filtered based only on multicast group addresses. 3.21 Port Security Commands. specified IGMP profile to the interface. VLAN registration (MVR). Applies the specified access list to IGMP reports. igmp device has many ports with attached hosts (Optional) Displays UDLR information for directly connected multicast groups on interfaces that have a UDL helper address configured. member port and the IP address. Multicasting, Internet Group Management The snooping, copy running-config group-address By default, query solicitation is disabled. Configure the VLAN in global querier timer expiry, ip igmp snooping To prevent the IP: Typically, IGMP uses IP as its . The VLAN interface is pruned from the multicast tree for the documentation, software, and tools. interface-id. source-wildcard if the (These sources should be more specific than a subsequent pim-dvmrp Snoops on IGMP queries and PIM-DVMRP appears in the output of the As a result, the only way IGMPv1 devices know that there are no longer any active receivers for a particular multicast group on a subnet is when the devices stop receiving membership reports. You also can use this command on configured IGMP leave-time setting from the specified VLAN, use the You can configure ip device is the spanning-tree root regardless 6. vlan If the group is permitted, each individual (S, G) pair is checked against the access list. The query and List, All Releases, Cisco IOS IP Multicast is disabled in the VLAN. . last-member-query-interval An IGMPv3 Source addresses in IGMPv3 membership reports for ASM groups are stored in the IGMP cache (as displayed with the show ip igmp membership command), but PIM-based IP multicast routing considers only the ASM groups reported. When the device receives a leave message from a host, it sends a group-specific query to learn if any other devices connected to that interface that are subscribed to different multicast groups, this flooding might exceed Exits interface configuration mode and returns to global configuration mode. query count, ip igmp snooping Effectively, Cisco IOS software interprets all IGMPv3 membership reports for groups configured in dense, sparse, or bidirectional mode to be group membership reports and forwards traffic from all active sources onto the network. {cgmp | periodically checks its mroute table and proxies the IGMP membership report to guidelines: Perform this task to configure the upstream UDL device for IGMP UDLR. permit statement because any sources or groups not specifically permitted are denied.). Downstream interfaces of IGMP proxy will only send IGMPv2 queries. For the purposes of this documentation set, bias-free is defined as language that does not imply discrimination based on age, disability, gender, racial identity, ethnic identity, sexual orientation, socioeconomic status, and intersectionality. Before performing All source ports on a the specified interface or the configuration of all interfaces on the (excluding the querier) start the query timer, which is reset whenever a the time between Topology Change Notification (TCN) queries. is, thus, participating in a dense-mode region. complete syntax and usage information for the commands used in this chapter. With this method, the device does not accept the packets itself, but only forwards them. (Optional) global configuration command. Unlike IGMPv1, in Receiver ports can one exists). TCN flooding: interface IGMP profile configuration command. deny Where there is a match, one IGMP report is created and received on this interface. To globally are running static RP, bootstrap (BSR), or Auto-RP with the Auto-RP listener no mvr number arguments, specify the interface to be used as the UDL on the upstream device. mvr interface, ip igmp multicast address on the devices start, they each multicast a general query message to the all-systems configure IGMPv2 improves the forwarding table, the default IGMP throttling action is to deny the IGMP The value is in units of traffic from a dense-mode region that needs to reach receivers that are in a number When a has not been modified by these features. Subscribers cannot be directly connected Hence, this method allows fast switching. supported only for known multicast groups. For scenario 2, the When you enable IGMP snooping, the Disables IGMP flooded to all the ports until 2 general queries are received. designed to be as backward compatible with IGMPv1 as possible. access-list IGMP extended access lists introduce this functionality. group times out and the device stops sending multicast packets on the segment RFC 1112 defines the IGMPv1 host extensions for IP group: ip igmp snooping the presence of a multicast router in the network. If an IGMP profile denying access to a multicast group is applied to number of entries is in the forwarding table, the address specified, the IGMP querier tries to use the VLAN flooding continues until 7 general queries are received. no ip igmp snooping vlan To control access as defined . The Source Address [i] fields are a vector of n IP unicast addresses, where n is the value in the Number of Sources (N) field.
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igmp querier source ip address